{"id":7074,"date":"2026-10-07T16:13:08","date_gmt":"2026-10-07T08:13:08","guid":{"rendered":"https:\/\/walleglobal.com\/?p=7074"},"modified":"2026-10-07T16:13:10","modified_gmt":"2026-10-07T08:13:10","slug":"hplc-dichtungs-losungsmittel-kompatibilitats-hinweis","status":"publish","type":"post","link":"https:\/\/walleglobal.com\/de\/2026\/10\/hplc-seal-solvent-compatibility-guide\/","title":{"rendered":"HPLC-Dichtungs-L\u00f6sungsmittel-Kompatibilit\u00e4ts-Handbuch: PTFE, UHMWPE &amp; Co."},"content":{"rendered":"\n<!doctype html>\n<html lang=\"en\">\n<head>\n  <meta charset=\"utf-8\">\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n  <meta name=\"robots\" content=\"noindex,nofollow\">\n  <title>HPLC Seal Solvent Compatibility Guide \u2014 WordPress Page Preview<\/title>\n  <style>\nhtml, body { margin: 0; padding: 0; }\n\/* HPLC solvent compatibility guide \u2014 large-type, namespaced WordPress CSS *\/\n.hsc-page {\n  --ink: #172231;\n  --muted: 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font-weight: 800; }\n.hsc-tool-note { margin: 0 !important; padding: 13px 24px; border-top: 1px solid rgba(180,213,230,.14); color: #788c99 !important; background: #09141f; font-size: 10px !important; line-height: 1.55 !important; }\n\n\/* Tables and reusable blocks *\/\n.hsc-table-wrap { margin: 32px 0 25px; overflow-x: auto; border: 1px solid var(--line); border-radius: 15px; background: #fff; box-shadow: 0 17px 46px rgba(24,45,66,.06); }\n.hsc-table-wrap table { width: 100%; min-width: 690px; border: 0; border-collapse: collapse; margin: 0; }\n.hsc-table-wrap th { padding: 17px 18px; border: 0; border-bottom: 1px solid #ccd7e1; color: #eaf7ff; background: #172c3e; font-size: 10px; font-weight: 850; letter-spacing: .085em; text-align: left; text-transform: uppercase; }\n.hsc-table-wrap td { padding: 15px 18px; border: 0; border-bottom: 1px solid #e4e9ef; color: #536578; font-size: 13px; line-height: 1.58; vertical-align: top; }\n.hsc-table-wrap tbody tr:last-child td { border-bottom: 0; }\n.hsc-table-wrap tbody tr:nth-child(even) { background: #f9fbfd; }\n.hsc-table-wrap td:first-child { color: #2f4355; font-weight: 800; }\n.hsc-table-note { margin-top: -9px !important; color: #7a8897 !important; font-size: 12px !important; font-style: italic; }\n.hsc-rating { display: inline-block; padding: 5px 8px; border-radius: 999px; font-size: 10px; font-weight: 800; }\n.hsc-rating.is-good { color: #16797b; background: #dcf6f3; }\n.hsc-rating.is-review { color: #7d5d13; background: #fff3cc; }\n.hsc-rating.is-alert { color: #a14335; background: #ffe2dc; }\n.hsc-callout { display: grid; grid-template-columns: 155px 1fr; gap: 23px; align-items: center; margin: 30px 0; padding: 22px 24px; border: 1px solid #d6e5eb; border-radius: 12px; background: #f3fafc; }\n.hsc-callout span { color: #21899d; font-size: 9px; font-weight: 900; letter-spacing: .14em; }\n.hsc-callout p { margin: 0; color: #526775; font-size: 14px; line-height: 1.67; }\n.hsc-callout.is-warning { border-color: #eadbcb; background: #fdf8f2; }\n.hsc-callout.is-warning span { color: #ad6334; }\n.hsc-duty-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 13px; margin: 31px 0; }\n.hsc-duty-grid article { padding: 23px 20px; border: 1px solid #dce5ec; border-radius: 13px; background: #f9fbfd; }\n.hsc-duty-grid span { color: #298ca2; font-size: 10px; font-weight: 900; }\n.hsc-duty-grid h3 { margin: 25px 0 9px; font-size: 16px; }\n.hsc-duty-grid p { margin: 0; color: #6c7d8a; font-size: 12px; line-height: 1.62; }\n.hsc-cascade { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: center; margin: 32px 0; }\n.hsc-cascade > div { padding: 21px; border: 1px solid #dce5ec; border-radius: 12px; background: #f9fbfd; }\n.hsc-cascade > i { padding: 0 8px; color: #98a8b5; font-style: normal; }\n.hsc-cascade span { display: block; margin-bottom: 11px; color: #7d91a1; font-size: 9px; font-weight: 900; letter-spacing: .12em; }\n.hsc-cascade b { color: #364b5d; font-size: 13px; }\n.hsc-cascade .is-alert { border-color: #ebd1ca; background: #fff6f3; }\n.hsc-cascade .is-alert span { color: #bd6048; }\n.hsc-formulation-card { display: grid; grid-template-columns: 1fr 65px 1.4fr; align-items: stretch; margin: 32px 0; }\n.hsc-formulation-card > div { padding: 26px; border: 1px solid #dce5ec; border-radius: 13px; background: #f9fbfd; }\n.hsc-formulation-card > i { align-self: center; color: #8195a4; font-size: 24px; font-style: normal; text-align: center; }\n.hsc-formulation-card span { display: block; color: #8999a6; font-size: 9px; font-weight: 900; letter-spacing: .12em; }\n.hsc-formulation-card strong { display: block; margin-top: 20px; color: #405568; font-size: 18px; line-height: 1.45; }\n.hsc-formulation-card .is-complete { color: #eefaff; border-color: #24495f; background: #173145; }\n.hsc-formulation-card .is-complete span { color: #75e6e2; }\n.hsc-formulation-card .is-complete strong { color: #effaff; }\n.hsc-risk-panel { display: grid; grid-template-columns: 1.1fr .9fr; margin: 31px 0; overflow: hidden; border: 1px solid #d4e0e8; border-radius: 16px; }\n.hsc-risk-panel > div { padding: 30px; color: #effaff; background: linear-gradient(135deg,#173e52,#102331); }\n.hsc-risk-panel > div span { color: #70e4e0; font-size: 9px; font-weight: 900; letter-spacing: .14em; }\n.hsc-risk-panel h3 { margin: 14px 0 0; color: #eefaff; font-size: 22px; line-height: 1.36; }\n.hsc-risk-panel ul { margin: 0; padding: 26px 28px 26px 45px; background: #f5fafc; }\n.hsc-risk-panel li { padding: 7px 0; color: #617383; font-size: 12px; line-height: 1.55; }\n.hsc-system-chain, .hsc-normal-flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: stretch; gap: 11px; margin: 32px 0; }\n.hsc-system-chain > div, .hsc-normal-flow > div { padding: 24px 20px; border: 1px solid #dce5ec; border-radius: 13px; background: #f9fbfd; }\n.hsc-system-chain > i, .hsc-normal-flow > i { align-self: center; color: #91a3b0; font-size: 20px; font-style: normal; }\n.hsc-system-chain span, .hsc-system-chain b, .hsc-system-chain small, .hsc-normal-flow span, .hsc-normal-flow b { display: block; }\n.hsc-system-chain span, .hsc-normal-flow span { color: #288ba1; font-size: 9px; font-weight: 900; letter-spacing: .13em; }\n.hsc-system-chain b, .hsc-normal-flow b { margin: 14px 0 7px; color: #394f60; font-size: 14px; }\n.hsc-system-chain small { color: #778998; font-size: 10px; }\n.hsc-bridge { display: grid; grid-template-columns: 1fr 145px 1fr; align-items: center; margin: 32px 0; padding: 30px; border-radius: 15px; background: #172c3e; }\n.hsc-bridge article { padding: 22px; border: 1px solid #40566a; border-radius: 11px; }\n.hsc-bridge article span { color: #8ca3b3; font-size: 9px; font-weight: 900; letter-spacing: .13em; }\n.hsc-bridge article b { display: block; margin-top: 15px; color: #e6f2f9; font-size: 14px; }\n.hsc-bridge > div { text-align: center; }\n.hsc-bridge > div strong { display: block; color: #78e8e4; font-size: 31px; }\n.hsc-bridge > div small { display: block; margin-top: 5px; color: #8fa4b2; font-size: 8px; font-weight: 850; }\n.hsc-solvent-alert { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; margin: 32px 0; }\n.hsc-solvent-alert > div { padding: 27px; border: 1px solid #ddd8ed; border-radius: 14px; background: #f8f6fc; }\n.hsc-solvent-alert > div:first-child { border-color: #ead2ca; background: #fff6f3; }\n.hsc-solvent-alert span { color: #7b61c1; font-size: 9px; font-weight: 900; letter-spacing: .13em; }\n.hsc-solvent-alert > div:first-child span { color: #b95a42; }\n.hsc-solvent-alert h3 { margin: 22px 0 10px; font-size: 19px; line-height: 1.38; }\n.hsc-solvent-alert p { margin: 0; color: #687786; font-size: 13px; line-height: 1.65; }\n.hsc-tradeoff-line { display: flex; flex-wrap: wrap; gap: 9px; align-items: center; padding: 18px; border-radius: 11px; background: #f3f6fa; }\n.hsc-tradeoff-line span { margin-right: 6px; color: #5e6f7e; font-size: 9px; font-weight: 900; letter-spacing: .12em; }\n.hsc-tradeoff-line b { padding: 7px 9px; border: 1px solid #d7e0e8; border-radius: 7px; color: #4d6173; background: #fff; font-size: 10px; }\n.hsc-review-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 13px; margin: 32px 0; }\n.hsc-review-grid article { padding: 23px 20px; border: 1px solid #dce5ec; border-radius: 13px; background: #f9fbfd; }\n.hsc-review-grid span { color: #2d8ca1; font-size: 10px; font-weight: 900; }\n.hsc-review-grid h3 { margin: 25px 0 9px; font-size: 16px; }\n.hsc-review-grid p { margin: 0; color: #6d7d8a; font-size: 12px; line-height: 1.62; }\n\n\/* Buffers, pH and materials *\/\n.hsc-buffer-process { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr; align-items: center; margin: 32px 0; }\n.hsc-buffer-process > div { min-height: 132px; padding: 21px 18px; border: 1px solid #dce5ec; border-radius: 12px; background: #f9fbfd; }\n.hsc-buffer-process > i { padding: 0 7px; color: #97a7b4; font-style: normal; }\n.hsc-buffer-process span { display: block; color: #7e91a1; font-size: 8px; font-weight: 900; letter-spacing: .12em; }\n.hsc-buffer-process b { display: block; margin-top: 17px; color: #405568; font-size: 12px; line-height: 1.45; }\n.hsc-buffer-process .is-crystal { border-color: #e8d8ae; background: #fffbef; }\n.hsc-buffer-process .is-crystal span { color: #9d7923; }\n.hsc-buffer-process .is-damage { border-color: #ebd0c8; background: #fff6f3; }\n.hsc-buffer-process .is-damage span { color: #af503e; }\n.hsc-five-checks { padding: 23px; border-radius: 13px; color: #e8f4fa; background: #172c3e; }\n.hsc-five-checks > span { color: #75e3df; font-size: 9px; font-weight: 900; letter-spacing: .14em; }\n.hsc-five-checks > div { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 17px; }\n.hsc-five-checks b { padding: 8px 11px; border: 1px solid #425a6d; border-radius: 7px; font-size: 11px; }\n.hsc-ph-scale { display: grid; grid-template-columns: 1fr 110px 1fr; align-items: stretch; margin: 32px 0; }\n.hsc-ph-scale article { padding: 28px; border: 1px solid #d8e1eb; border-radius: 14px; }\n.hsc-ph-scale article.is-acid { background: #f7f4fc; }\n.hsc-ph-scale article.is-base { background: #f1f9fc; }\n.hsc-ph-scale article span { color: #765abd; font-size: 10px; font-weight: 900; letter-spacing: .13em; }\n.hsc-ph-scale article.is-base span { color: #2186a0; }\n.hsc-ph-scale article b { display: block; margin: 22px 0 11px; color: #3a4f62; font-size: 16px; line-height: 1.45; }\n.hsc-ph-scale article p { margin: 0; color: #697a89; font-size: 13px; line-height: 1.65; }\n.hsc-ph-scale > div { display: grid; grid-template-columns: 1fr auto 1fr; gap: 7px; align-items: center; padding: 0 10px; }\n.hsc-ph-scale > div i { height: 2px; background: #b5c0ca; }\n.hsc-ph-scale > div strong { color: #6d7f8e; font-size: 12px; }\n.hsc-material-stack { display: grid; gap: 14px; margin: 32px 0; }\n.hsc-material-stack article { display: grid; grid-template-columns: 1.1fr 1.45fr .8fr; gap: 24px; align-items: center; padding: 25px; border: 1px solid #dce5ec; border-radius: 14px; background: #f9fbfd; }\n.hsc-material-stack article > div span { color: #2a8ba1; font-size: 10px; font-weight: 900; letter-spacing: .13em; }\n.hsc-material-stack article > div h3 { margin: 12px 0 0; font-size: 18px; line-height: 1.35; }\n.hsc-material-stack article > p { margin: 0; color: #667786; font-size: 13px; line-height: 1.67; }\n.hsc-material-stack article > ul { margin: 0; padding-left: 18px; color: #586b7a; font-size: 11px; line-height: 1.8; }\n.hsc-material-stack article.is-filled { border-color: #dad6ec; background: #f8f6fc; }\n.hsc-material-stack article.is-filled > div span { color: #745bbd; }\n.hsc-material-stack article.is-uhmwpe { border-color: #d3e8e7; background: #f2fbfa; }\n.hsc-material-stack article.is-uhmwpe > div span { color: #1e8c8c; }\n.hsc-material-stack article.is-peek { border-color: #e7ddce; background: #fcf9f4; }\n.hsc-material-stack article.is-peek > div span { color: #a56a31; }\n.hsc-elastomer-row { display: grid; grid-template-columns: repeat(3,1fr); gap: 13px; }\n.hsc-elastomer-row article { padding: 22px; border: 1px solid #dce5ec; border-radius: 12px; }\n.hsc-elastomer-row span { color: #315e7a; font-size: 11px; font-weight: 900; }\n.hsc-elastomer-row p { margin: 12px 0 0; color: #687987; font-size: 12px; line-height: 1.62; }\n\n\/* Wash and precipitation *\/\n.hsc-wash-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; margin: 32px 0; }\n.hsc-wash-grid article { padding: 27px; border: 1px solid #d9e4eb; border-radius: 14px; background: #f8fbfd; }\n.hsc-wash-grid article > span { color: #27899e; font-size: 9px; font-weight: 900; letter-spacing: .13em; }\n.hsc-wash-grid h3 { margin: 21px 0 16px; font-size: 19px; }\n.hsc-wash-grid article > div { display: inline-flex; flex-direction: column; width: calc(50% - 6px); min-height: 85px; padding: 13px; border: 1px solid #d6e2e9; border-radius: 9px; background: #fff; }\n.hsc-wash-grid article > div + div { margin-left: 7px; }\n.hsc-wash-grid article > div.is-wide { width: 100%; }\n.hsc-wash-grid article > div b { color: #267f98; font-size: 21px; }\n.hsc-wash-grid article > div small { margin-top: 5px; color: #718390; font-size: 10px; line-height: 1.45; }\n.hsc-wash-grid article > p { margin: 16px 0 0; color: #687987; font-size: 12px; line-height: 1.62; }\n.hsc-precip-visual { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr; align-items: center; margin: 33px 0; padding: 28px; border-radius: 15px; background: #172c3e; }\n.hsc-precip-visual > div { min-height: 150px; padding: 18px 14px; border: 1px solid #41586a; border-radius: 11px; text-align: center; }\n.hsc-precip-visual > em { padding: 0 7px; color: #8098a9; font-size: 20px; font-style: normal; }\n.hsc-precip-visual span { display: block; color: #829aaa; font-size: 8px; font-weight: 900; letter-spacing: .12em; }\n.hsc-precip-visual b, .hsc-precip-visual strong { display: block; margin-top: 12px; color: #e7f3fa; font-size: 11px; }\n.hsc-droplet { display: block; width: 38px; height: 48px; margin: 14px auto 0; border-radius: 60% 40% 65% 35% \/ 60% 40% 60% 40%; background: #55d8d4; transform: rotate(45deg); }\n.hsc-droplet.is-organic { background: #8069db; }\n.hsc-precip-visual .is-crystals > i { display: flex; flex-wrap: wrap; justify-content: center; gap: 7px; margin-top: 19px; }\n.hsc-precip-visual .is-crystals > i b { width: 13px; height: 13px; margin: 0; background: #f0c86c; transform: rotate(45deg); }\n.hsc-precip-visual .is-damage > i { display: block; width: 70px; height: 19px; margin: 25px auto 0; border-radius: 10px; background: linear-gradient(#dae6eb,#718b99); box-shadow: inset 0 -3px #b85245; }\n\n\/* Failure, pressure, selection *\/\n.hsc-failure-grid { display: grid; grid-template-columns: repeat(6,1fr); gap: 12px; margin: 32px 0; }\n.hsc-failure-grid article { grid-column: span 2; padding: 23px; border: 1px solid #e0e3e7; border-radius: 13px; background: #fafbfc; }\n.hsc-failure-grid article:nth-child(4) { grid-column: 2 \/ span 2; }\n.hsc-failure-grid article:nth-child(5) { grid-column: 4 \/ span 2; }\n.hsc-failure-grid span { color: #c56c46; font-size: 10px; font-weight: 900; }\n.hsc-failure-grid h3 { margin: 23px 0 9px; font-size: 17px; }\n.hsc-failure-grid p { min-height: 57px; margin: 0 0 14px; color: #6d7b87; font-size: 12px; line-height: 1.6; }\n.hsc-failure-grid small { display: block; padding-top: 13px; border-top: 1px solid #e2e5e8; color: #8b6f62; font-size: 10px; line-height: 1.5; }\n.hsc-pressure-stage { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1.08fr; align-items: stretch; margin: 32px 0; overflow: hidden; border: 1px solid #dce5ec; border-radius: 14px; background: #f8fafc; }\n.hsc-pressure-stage > div { padding: 23px 19px; }\n.hsc-pressure-stage > i { align-self: center; color: #9aaab7; font-size: 19px; font-style: normal; }\n.hsc-pressure-stage span, .hsc-pressure-stage b, .hsc-pressure-stage small { display: block; }\n.hsc-pressure-stage span { color: #7c90a0; font-size: 8px; font-weight: 900; letter-spacing: .12em; }\n.hsc-pressure-stage b { margin: 13px 0 7px; color: #3d5264; font-size: 13px; }\n.hsc-pressure-stage small { color: #798a97; font-size: 10px; line-height: 1.45; }\n.hsc-pressure-stage .is-result { background: #172c3e; }\n.hsc-pressure-stage .is-result span { color: #70e2de; }\n.hsc-pressure-stage .is-result b { color: #edf9ff; }\n.hsc-pressure-stage .is-result small { color: #93a7b5; }\n.hsc-pressure-compare { display: grid; grid-template-columns: repeat(2,1fr); gap: 15px; margin: 25px 0; }\n.hsc-pressure-compare article { padding: 27px; border: 1px solid #d8e3eb; border-radius: 14px; background: #f8fbfd; }\n.hsc-pressure-compare article > span { color: #26899f; font-size: 9px; font-weight: 900; letter-spacing: .13em; }\n.hsc-pressure-compare strong { display: block; margin: 20px 0 11px; color: #247d9a; font-size: 34px; }\n.hsc-pressure-compare i { display: block; width: 38%; height: 5px; margin-bottom: 16px; border-radius: 99px; background: linear-gradient(90deg,var(--cyan),var(--blue)); }\n.hsc-pressure-compare article + article i { width: 92%; background: linear-gradient(90deg,var(--blue),var(--violet)); }\n.hsc-pressure-compare p { margin: 0; color: #667987; font-size: 13px; line-height: 1.62; }\n.hsc-balance { margin: 32px 0; padding: 27px; border-radius: 15px; color: #eaf6fc; background: #172c3e; }\n.hsc-balance > span { color: #72e3df; font-size: 9px; font-weight: 900; letter-spacing: .14em; }\n.hsc-balance > div { display: grid; grid-template-columns: repeat(5,1fr); gap: 10px; margin-top: 21px; }\n.hsc-balance article { padding: 18px 14px; border: 1px solid #42596b; border-radius: 10px; }\n.hsc-balance b { color: #7ee8e4; font-size: 10px; }\n.hsc-balance p { margin: 17px 0 0; color: #c4d3dc; font-size: 11px; line-height: 1.45; }\n.hsc-steps { display: grid; grid-template-columns: repeat(2,1fr); gap: 12px; margin: 32px 0; }\n.hsc-steps article { display: grid; grid-template-columns: 51px 1fr; gap: 16px; align-items: center; padding: 19px; border: 1px solid #dce5ec; border-radius: 12px; background: #f9fbfd; }\n.hsc-steps article > span { display: grid; place-items: center; width: 51px; height: 51px; border-radius: 50%; color: #217e9c; background: #dff5f6; font-size: 10px; font-weight: 900; }\n.hsc-steps h3 { margin: 0 0 6px; font-size: 15px; }\n.hsc-steps p { margin: 0; color: #6e7e8b; font-size: 11px; line-height: 1.52; }\n.hsc-mistake-list { margin: 31px 0; border-top: 1px solid #dce5ec; }\n.hsc-mistake-list article { display: grid; grid-template-columns: 48px 1fr; gap: 19px; padding: 20px 5px; border-bottom: 1px solid #dce5ec; }\n.hsc-mistake-list article > b { color: #bf6947; font-size: 11px; }\n.hsc-mistake-list h3 { margin: 0 0 7px; font-size: 16px; }\n.hsc-mistake-list p { margin: 0; color: #6d7d89; font-size: 12px; line-height: 1.57; }\n.hsc-case-head { display: grid; grid-template-columns: repeat(2,1fr); overflow: hidden; margin: 32px 0 14px; border-radius: 13px; background: #172c3e; }\n.hsc-case-head > div { padding: 24px; }\n.hsc-case-head > div + div { border-left: 1px solid #43596b; }\n.hsc-case-head span { display: block; color: #70e2de; font-size: 9px; font-weight: 900; letter-spacing: .13em; }\n.hsc-case-head b { display: block; margin-top: 14px; color: #eaf6fc; font-size: 14px; line-height: 1.5; }\n.hsc-case-steps { display: grid; grid-template-columns: repeat(2,1fr); gap: 10px; }\n.hsc-case-steps article { display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: start; padding: 16px; border: 1px solid #dce5ec; border-radius: 10px; background: #f9fbfd; }\n.hsc-case-steps span { color: #278aa1; font-size: 10px; font-weight: 900; }\n.hsc-case-steps p { margin: 0; color: #607382; font-size: 12px; line-height: 1.55; }\n.hsc-summary-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 12px; margin: 32px 0; }\n.hsc-summary-grid article { padding: 23px 19px; border: 1px solid #d8e5eb; border-radius: 12px; background: #f3fafc; }\n.hsc-summary-grid span { color: #258ba1; font-size: 9px; font-weight: 900; letter-spacing: .12em; }\n.hsc-summary-grid h3 { margin: 26px 0 9px; font-size: 16px; }\n.hsc-summary-grid p { margin: 0; color: #697b88; font-size: 11px; line-height: 1.57; }\n\n\/* FAQ and CTA *\/\n.hsc-faq-list { margin-top: 33px; border-top: 1px solid #dbe4eb; }\n.hsc-faq-item { border-bottom: 1px solid #dbe4eb; }\n.hsc-faq-item > button { display: grid; grid-template-columns: 1fr 32px; gap: 19px; align-items: center; width: 100%; padding: 22px 4px; border: 0; color: #2d4152; background: transparent; text-align: left; cursor: pointer; }\n.hsc-faq-item > button span { font-size: 15px; font-weight: 780; }\n.hsc-faq-item > button i { position: relative; display: block; width: 27px; height: 27px; border: 1px solid #cbd7e0; border-radius: 50%; }\n.hsc-faq-item > button i::before, .hsc-faq-item > button i::after { content: \"\"; position: absolute; top: 12px; left: 8px; width: 10px; height: 1px; background: #64798a; transition: transform .2s ease; }\n.hsc-faq-item > button i::after { transform: rotate(90deg); }\n.hsc-faq-item.is-open > button i::after { transform: rotate(0); }\n.hsc-faq-answer { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .25s ease; }\n.hsc-faq-answer > p { min-height: 0; margin: 0; overflow: hidden; color: #627584; font-size: 13px; line-height: 1.72; }\n.hsc-faq-item.is-open .hsc-faq-answer { grid-template-rows: 1fr; }\n.hsc-faq-item.is-open .hsc-faq-answer > p { padding: 0 48px 22px 4px; }\n.hsc-contact { display: grid; grid-template-columns: 1.15fr .85fr; margin-top: 90px; overflow: hidden; border-radius: 19px; scroll-margin-top: 120px; box-shadow: 0 25px 62px rgba(18,43,60,.16); }\n.hsc-contact-copy { padding: 45px; color: #effaff; background: radial-gradient(circle at 15% 10%,#234e61,#142d3d 56%,#0e1d2a); 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.hsc-case-head > div + div { border-top: 1px solid #43596b; border-left: 0; }\n  .hsc-contact-copy, .hsc-contact-spec { padding: 31px 24px; }\n  .hsc-contact-copy h2 { font-size: 29px; }\n  .hsc-back-top { right: 15px; bottom: 15px; }\n}\n@media (prefers-reduced-motion: reduce) {\n  .hsc-page *, .hsc-page *::before, .hsc-page *::after { scroll-behavior: auto !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }\n}\n  <\/style>\n<\/head>\n<body>\n<div class=\"hsc-page\" id=\"hsc-top\" data-hsc-page>\n  <div class=\"hsc-reading-progress\" aria-hidden=\"true\"><span data-hsc-progress><\/span><\/div>\n\n  <header class=\"hsc-hero\">\n    <div class=\"hsc-hero-grid\" aria-hidden=\"true\"><\/div>\n    <div class=\"hsc-hero-glow hsc-glow-one\" aria-hidden=\"true\"><\/div>\n    <div class=\"hsc-hero-glow hsc-glow-two\" aria-hidden=\"true\"><\/div>\n    <div class=\"hsc-hero-inner\">\n      <div class=\"hsc-hero-copy\">\n        <div class=\"hsc-breadcrumb\"><span>Walle Seals<\/span><i><\/i><span>Materials &amp; Compatibility<\/span><\/div>\n        <div class=\"hsc-eyebrow\"><b><\/b>HPLC \/ UHPLC FLUID-PATH GUIDE<\/div>\n        <h1>HPLC Seal Solvent Compatibility Guide<\/h1>\n        <p class=\"hsc-hero-deck\">Compare PTFE, filled PTFE, UHMWPE, PEEK and elastomer sealing behavior across acetonitrile, methanol, THF, ketones, hexane, buffers and high-pH mobile phases.<\/p>\n        <div class=\"hsc-hero-actions\">\n          <a class=\"hsc-button hsc-button-primary\" href=\"#hsc-overview\">Screen the mobile phase <b>\u2193<\/b><\/a>\n          <a class=\"hsc-button hsc-button-ghost\" href=\"#hsc-specification\">Open the specification list<\/a>\n        <\/div>\n        <div class=\"hsc-metrics\" aria-label=\"Guide overview\"><div><strong>11<\/strong><span>solvent environments<\/span><\/div><div><strong>7<\/strong><span>material families<\/span><\/div><div><strong>1,000<\/strong><span>bar changes the equation<\/span><\/div><\/div>\n      <\/div>\n\n      <figure class=\"hsc-hero-visual\" aria-label=\"HPLC piston seal and solvent stream cutaway\">\n        <div class=\"hsc-visual-label\"><span>DYNAMIC SEALING<\/span><b>SOLVENT \u00d7 PRESSURE \u00d7 MOTION<\/b><\/div>\n        <svg viewBox=\"0 0 720 620\" role=\"img\" aria-labelledby=\"hsc-hero-title hsc-hero-desc\">\n          <title id=\"hsc-hero-title\">HPLC piston seal compatibility<\/title>\n          <desc id=\"hsc-hero-desc\">A high-pressure chromatography piston slides through a polymer seal while mixed solvents flow through the pump head.<\/desc>\n          <defs>\n            <linearGradient id=\"hsc-metal\" x1=\"0\" y1=\"0\" x2=\"1\" y2=\"1\"><stop offset=\"0\" stop-color=\"#e4edf2\"\/><stop offset=\".45\" stop-color=\"#8ba2af\"\/><stop offset=\"1\" stop-color=\"#435968\"\/><\/linearGradient>\n            <linearGradient id=\"hsc-solvent\" x1=\"0\" y1=\"0\" x2=\"1\" y2=\"0\"><stop offset=\"0\" stop-color=\"#42e8dd\"\/><stop offset=\".48\" stop-color=\"#4a9fff\"\/><stop offset=\"1\" stop-color=\"#a777ff\"\/><\/linearGradient>\n            <linearGradient id=\"hsc-seal\" x1=\"0\" y1=\"0\" x2=\"1\" y2=\"1\"><stop offset=\"0\" stop-color=\"#f4ffff\"\/><stop offset=\".45\" stop-color=\"#8bf3ef\"\/><stop offset=\"1\" stop-color=\"#2188ad\"\/><\/linearGradient>\n            <filter id=\"hsc-shadow\" x=\"-50%\" y=\"-50%\" width=\"200%\" height=\"200%\"><feDropShadow dx=\"0\" dy=\"22\" stdDeviation=\"18\" flood-color=\"#000\" flood-opacity=\".42\"\/><\/filter>\n            <filter id=\"hsc-glow\" x=\"-160%\" y=\"-160%\" width=\"320%\" height=\"320%\"><feGaussianBlur stdDeviation=\"6\" result=\"b\"\/><feMerge><feMergeNode in=\"b\"\/><feMergeNode in=\"SourceGraphic\"\/><\/feMerge><\/filter>\n          <\/defs>\n          <g opacity=\".25\" stroke=\"#54768d\" fill=\"none\"><path d=\"M48 112H672M48 202H672M48 292H672M48 382H672M48 472H672\" stroke-dasharray=\"3 11\"\/><path d=\"M105 72V536M225 72V536M345 72V536M465 72V536M585 72V536\" stroke-dasharray=\"3 11\"\/><\/g>\n          <g filter=\"url(#hsc-shadow)\">\n            <path d=\"M101 198h518v240H101z\" fill=\"#101b28\" stroke=\"#5f7484\"\/>\n            <path d=\"M101 198h518v67H101zM101 371h518v67H101z\" fill=\"url(#hsc-metal)\"\/>\n            <path d=\"M143 265h434v106H143z\" fill=\"#192b3d\"\/>\n            <path d=\"M143 293h434v50H143z\" fill=\"url(#hsc-solvent)\" opacity=\".9\"\/>\n            <rect x=\"105\" y=\"288\" width=\"364\" height=\"60\" rx=\"27\" fill=\"url(#hsc-metal)\" stroke=\"#e8f4fa\"\/>\n            <path d=\"M475 263h44v24c0 17-13 30-30 30h-14zM475 369h44v-24c0-17-13-30-30-30h-14z\" fill=\"url(#hsc-seal)\" stroke=\"#e7ffff\" stroke-width=\"2\"\/>\n          <\/g>\n          <g font-family=\"Arial, sans-serif\">\n            <text x=\"278\" y=\"158\" fill=\"#b7cad6\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\">RECIPROCATING PISTON<\/text><text x=\"278\" y=\"176\" fill=\"#7f96a5\" text-anchor=\"middle\" font-size=\"9\">millions of sliding cycles<\/text>\n            <text x=\"525\" y=\"158\" fill=\"#8ef7f0\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\">POLYMER SEAL LIP<\/text><text x=\"525\" y=\"176\" fill=\"#7f96a5\" text-anchor=\"middle\" font-size=\"9\">chemistry + wear + pressure<\/text>\n            <path d=\"M278 217v68M525 217v45\" stroke=\"#8aa1b0\" stroke-width=\"2\" stroke-dasharray=\"4 5\"\/>\n            <path d=\"M200 318h-65M395 318h65\" stroke=\"#eff7fb\" stroke-width=\"3\"\/><path d=\"M135 318l15-9v18zM460 318l-15-9v18z\" fill=\"#eff7fb\"\/>\n            <g filter=\"url(#hsc-glow)\"><circle cx=\"546\" cy=\"317\" r=\"8\" fill=\"#adffff\"\/><circle cx=\"569\" cy=\"317\" r=\"5\" fill=\"#c8a9ff\"\/><circle cx=\"592\" cy=\"317\" r=\"7\" fill=\"#7dbdff\"\/><\/g>\n            <text x=\"360\" y=\"480\" fill=\"#7d95a4\" text-anchor=\"middle\" font-size=\"8\" letter-spacing=\"1.5\">CHEMICAL SURVIVAL ALONE DOES NOT PREDICT PUMP LIFE<\/text>\n          <\/g>\n          <g transform=\"translate(188 505)\"><rect width=\"344\" height=\"54\" rx=\"11\" fill=\"#09121d\" stroke=\"#536b7c\"\/><text x=\"172\" y=\"21\" fill=\"#8099a8\" text-anchor=\"middle\" font-family=\"Arial\" font-size=\"8\" letter-spacing=\"1.35\">BALANCE FIVE REQUIREMENTS<\/text><text x=\"172\" y=\"39\" fill=\"#eefaff\" text-anchor=\"middle\" font-family=\"Arial\" font-size=\"12\" font-weight=\"700\">CHEMISTRY \u00b7 FRICTION \u00b7 WEAR \u00b7 PRESSURE \u00b7 STABILITY<\/text><\/g>\n        <\/svg>\n        <figcaption><span><\/span>The correct material is the one that survives both the solvent and the pump mechanics.<\/figcaption>\n      <\/figure>\n    <\/div>\n  <\/header>\n\n  <div class=\"hsc-content-shell\" data-hsc-shell>\n    <aside class=\"hsc-sidebar\" data-hsc-sidebar>\n      <div class=\"hsc-sidebar-card\" data-hsc-sidebar-card>\n        <div class=\"hsc-sidebar-title\"><span>On this page<\/span><button type=\"button\" data-hsc-toc-toggle aria-expanded=\"false\">Contents <b>+<\/b><\/button><\/div>\n        <nav class=\"hsc-toc\" data-hsc-toc aria-label=\"Article contents\">\n          <a href=\"#hsc-overview\"><span>00<\/span><em>Material Overview<\/em><\/a>\n          <a href=\"#hsc-why\"><span>01<\/span><em>Why Compatibility Matters<\/em><\/a>\n          <a href=\"#hsc-acn\"><span>02<\/span><em>Acetonitrile<\/em><\/a>\n          <a href=\"#hsc-methanol\"><span>03<\/span><em>Methanol<\/em><\/a>\n          <a href=\"#hsc-ipa\"><span>04<\/span><em>Isopropyl Alcohol<\/em><\/a>\n          <a href=\"#hsc-thf\"><span>05<\/span><em>Tetrahydrofuran<\/em><\/a>\n          <a href=\"#hsc-ketones\"><span>06<\/span><em>Ketones<\/em><\/a>\n          <a href=\"#hsc-hexane\"><span>07<\/span><em>Hexane<\/em><\/a>\n          <a href=\"#hsc-aqueous\"><span>08<\/span><em>Water &amp; Buffers<\/em><\/a>\n          <a href=\"#hsc-ph\"><span>09<\/span><em>High-pH &amp; Acidic Phases<\/em><\/a>\n          <a href=\"#hsc-materials\"><span>10<\/span><em>Seal Materials<\/em><\/a>\n          <a href=\"#hsc-screening\"><span>11<\/span><em>Solvent Screening Table<\/em><\/a>\n          <a href=\"#hsc-wash\"><span>12<\/span><em>Seal-Wash Compatibility<\/em><\/a>\n          <a href=\"#hsc-precipitation\"><span>13<\/span><em>Prevent Precipitation<\/em><\/a>\n          <a href=\"#hsc-failures\"><span>14<\/span><em>Failure Symptoms<\/em><\/a>\n          <a href=\"#hsc-pressure\"><span>15<\/span><em>Pressure Interaction<\/em><\/a>\n          <a href=\"#hsc-uhplc\"><span>16<\/span><em>HPLC vs UHPLC<\/em><\/a>\n          <a href=\"#hsc-selection\"><span>17<\/span><em>7-Step Selection Process<\/em><\/a>\n          <a href=\"#hsc-specification\"><span>18<\/span><em>Custom-Seal Information<\/em><\/a>\n          <a href=\"#hsc-mistakes\"><span>19<\/span><em>Selection Mistakes<\/em><\/a>\n          <a href=\"#hsc-troubleshooting\"><span>20<\/span><em>Troubleshooting Example<\/em><\/a>\n          <a href=\"#hsc-summary\"><span>21<\/span><em>Engineering Summary<\/em><\/a>\n          <a href=\"#hsc-faq\"><span>22<\/span><em>Frequently Asked Questions<\/em><\/a>\n          <a href=\"#hsc-contact\"><span>23<\/span><em>Application Review<\/em><\/a>\n        <\/nav>\n        <div class=\"hsc-sidebar-note\"><span>KEY PRINCIPLE<\/span><p>Specify the complete mobile phase, gradient, additives, pressure and pump model\u2014not only the main solvent.<\/p><\/div>\n      <\/div>\n    <\/aside>\n\n    <main class=\"hsc-main\">\n      <article class=\"hsc-article\" data-hsc-article>\n        <section class=\"hsc-intro\">\n          <div class=\"hsc-tags\"><span>HPLC Seals<\/span><span>UHPLC Seals<\/span><span>Solvent Compatibility<\/span><span>Pump Seals<\/span><\/div>\n          <p>HPLC and UHPLC pump seals work in direct contact with water, organic solvents, acids, bases, buffers and cleaning media while repeatedly sliding against a piston\u2014often for millions of cycles.<\/p>\n          <p>A material that wears well in water and acetonitrile may degrade rapidly in THF, ketones or high-pH ammonium hydroxide. A material with broader chemical resistance may also create more abrasion, friction or piston wear.<\/p>\n          <blockquote><p><strong>HPLC solvent compatibility must be evaluated for the exact seal material, complete mobile-phase composition, pressure, temperature and pump design\u2014not simply for the polymer family.<\/strong><\/p><\/blockquote>\n          <div class=\"hsc-principle-chain\"><div><span>CHEMISTRY<\/span><b>Full formulation<\/b><small>Solvents + additives + gradient<\/small><\/div><i>\u00d7<\/i><div><span>MECHANICS<\/span><b>Pressure + motion<\/b><small>Contact load and cycle count<\/small><\/div><i>\u00d7<\/i><div><span>HARDWARE<\/span><b>Piston + pump<\/b><small>Finish, material and clearances<\/small><\/div><i>\u2192<\/i><div class=\"is-result\"><span>RESULT<\/span><b>Reliable seal life<\/b><small>Material and geometry together<\/small><\/div><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-overview\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">00<\/span><div><p>INITIAL SCREEN<\/p><h2>HPLC Seal Materials at a Glance<\/h2><\/div><\/div>\n          <p>Select a representative mobile-phase challenge to see the first material question to investigate. The result is a screening direction, not a substitute for the instrument manufacturer&#8217;s requirements.<\/p>\n          <div class=\"hsc-selector is-routine\" data-hsc-selector>\n            <div class=\"hsc-selector-head\"><div><span>MOBILE-PHASE SCREENING TOOL<\/span><h3>Select the dominant solvent challenge<\/h3><\/div><strong data-hsc-selector-status>Routine reversed phase selected<\/strong><\/div>\n            <div class=\"hsc-selector-body\">\n              <div class=\"hsc-selector-controls\" role=\"group\" aria-label=\"Mobile-phase challenges\">\n                <button class=\"is-active\" type=\"button\" data-hsc-solvent=\"routine\" aria-pressed=\"true\"><i>ACN\/H\u2082O<\/i><span>Routine RP<\/span><\/button>\n                <button type=\"button\" data-hsc-solvent=\"thf\" aria-pressed=\"false\"><i>THF<\/i><span>Strong solvent<\/span><\/button>\n                <button type=\"button\" data-hsc-solvent=\"ketone\" aria-pressed=\"false\"><i>C=O<\/i><span>Ketones<\/span><\/button>\n                <button type=\"button\" data-hsc-solvent=\"highph\" aria-pressed=\"false\"><i>pH\u2191<\/i><span>High pH<\/span><\/button>\n                <button type=\"button\" data-hsc-solvent=\"buffer\" aria-pressed=\"false\"><i>SALT<\/i><span>Buffers<\/span><\/button>\n                <button type=\"button\" data-hsc-solvent=\"normal\" aria-pressed=\"false\"><i>HEX<\/i><span>Normal phase<\/span><\/button>\n              <\/div>\n              <div class=\"hsc-selector-stage\" aria-hidden=\"true\">\n                <div class=\"hsc-pump-head\"><span>MOBILE PHASE<\/span><i class=\"hsc-fluid\"><\/i><b data-hsc-stage-formula>ACN \/ H\u2082O<\/b><small data-hsc-stage-condition>ROUTINE REVERSED PHASE<\/small><\/div>\n                <div class=\"hsc-piston\"><i><\/i><b><\/b><span>PISTON<\/span><\/div>\n                <div class=\"hsc-seal-ring\"><i><\/i><span data-hsc-stage-material>UHMWPE \/ OEM SEAL<\/span><\/div>\n                <div class=\"hsc-risk-bar\"><span>REVIEW INTENSITY<\/span><i><b><\/b><\/i><strong data-hsc-stage-risk>STANDARD CHECK<\/strong><\/div>\n              <\/div>\n              <div class=\"hsc-selector-result\" aria-live=\"polite\"><span data-hsc-result-kicker>START WITH THE OEM REVERSED-PHASE SEAL<\/span><h3 data-hsc-result-title>Routine ACN\/water service often suits standard UHMWPE designs.<\/h3><p data-hsc-result-copy>The complete formulation still matters when acids, bases, buffers or unusual gradient endpoints are added.<\/p><div><b>VERIFY<\/b><p data-hsc-result-check>ACN percentage \u00b7 water \u00b7 additives \u00b7 pressure \u00b7 pump model<\/p><\/div><a href=\"#hsc-acn\" data-hsc-result-link>Open the acetonitrile section \u2192<\/a><\/div>\n            <\/div>\n            <p class=\"hsc-tool-note\">Preliminary screening only. Confirm the exact proprietary compound, piston pairing, pressure rating and OEM instructions before changing a seal.<\/p>\n          <\/div>\n          <div class=\"hsc-table-wrap\" role=\"region\" aria-label=\"HPLC sealing materials overview\" tabindex=\"0\"><table><thead><tr><th>Material<\/th><th>Chemical resistance<\/th><th>Wear resistance<\/th><th>Friction<\/th><th>Typical role<\/th><\/tr><\/thead><tbody>\n            <tr><td>UHMWPE<\/td><td>Very good for compatible media<\/td><td>Excellent<\/td><td>Low<\/td><td>Piston and plunger seals<\/td><\/tr>\n            <tr><td>Virgin PTFE<\/td><td>Exceptional<\/td><td>Moderate<\/td><td>Very low<\/td><td>Chemical-resistant seals<\/td><\/tr>\n            <tr><td>Filled PTFE<\/td><td>Excellent, filler-dependent<\/td><td>Improved<\/td><td>Low<\/td><td>Harsh-solvent pump seals<\/td><\/tr>\n            <tr><td>Polyethylene<\/td><td>Application-dependent<\/td><td>Good<\/td><td>Low<\/td><td>Specialized pump or wash seals<\/td><\/tr>\n            <tr><td>PEEK<\/td><td>Broad, not universal<\/td><td>Excellent<\/td><td>Higher<\/td><td>Structural, valve and support parts<\/td><\/tr>\n            <tr><td>FKM<\/td><td>Solvent-dependent<\/td><td>Good<\/td><td>Moderate<\/td><td>Static O-rings<\/td><\/tr>\n            <tr><td>EPDM<\/td><td>Good for aqueous systems<\/td><td>Good<\/td><td>Moderate<\/td><td>Water-based static sealing<\/td><\/tr>\n          <\/tbody><\/table><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-why\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">01<\/span><div><p>MULTIPLE DUTIES<\/p><h2>Why Solvent Compatibility Matters in HPLC Pumps<\/h2><\/div><\/div>\n          <p>A primary piston seal must contain the mobile phase, slide repeatedly against the piston, maintain contact pressure, resist swelling and produce minimal particles\u2014all at the same time.<\/p>\n          <div class=\"hsc-duty-grid\"><article><span>01<\/span><h3>Contain pressure<\/h3><p>Maintain leakage control across the complete gradient.<\/p><\/article><article><span>02<\/span><h3>Survive motion<\/h3><p>Withstand millions of reciprocating cycles.<\/p><\/article><article><span>03<\/span><h3>Hold dimensions<\/h3><p>Resist swelling, softening, shrinkage and creep.<\/p><\/article><article><span>04<\/span><h3>Protect the system<\/h3><p>Limit particles, piston wear and pressure variation.<\/p><\/article><\/div>\n          <div class=\"hsc-cascade\"><div><span>INCOMPATIBILITY<\/span><b>Swelling or softening<\/b><\/div><i>\u2192<\/i><div><span>MECHANICAL CHANGE<\/span><b>Friction and wear rise<\/b><\/div><i>\u2192<\/i><div class=\"is-alert\"><span>PUMP EFFECT<\/span><b>Leakage and unstable flow<\/b><\/div><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-acn\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">02<\/span><div><p>ACETONITRILE<\/p><h2>HPLC Seals and Acetonitrile<\/h2><\/div><\/div>\n          <p>Acetonitrile is a core reversed-phase solvent and is commonly mixed with water, formic acid, TFA, ammonium salts or ammonium hydroxide. Standard reversed-phase seals are often designed for ACN\/water, but additives can change the result.<\/p>\n          <div class=\"hsc-formulation-card\"><div><span>DO NOT SPECIFY ONLY<\/span><strong>\u201cACETONITRILE\u201d<\/strong><\/div><i>\u2192<\/i><div class=\"is-complete\"><span>SPECIFY THE FORMULATION<\/span><strong>90% ACN \/ 10% H\u2082O + 0.1% NH\u2084OH<\/strong><\/div><\/div>\n          <div class=\"hsc-risk-panel\"><div><span>ACN + AMMONIUM HYDROXIDE<\/span><h3>The base\u2014not necessarily the ACN\u2014may shorten UHMWPE seal life.<\/h3><\/div><ul><li>Give ACN and water percentages<\/li><li>State pH and NH\u2084OH concentration<\/li><li>List buffer additives<\/li><li>Include normal and maximum pressure<\/li><\/ul><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-methanol\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">03<\/span><div><p>METHANOL<\/p><h2>HPLC Seals and Methanol<\/h2><\/div><\/div>\n          <p>Many HPLC pump-seal materials are compatible with methanol-based mobile phases. The wider fluid path still needs review, especially with anhydrous methanol and acidic modifiers such as formic acid or TFA.<\/p>\n          <div class=\"hsc-system-chain\"><div><span>SEAL<\/span><b>Polymer stability<\/b><small>Swelling and wear<\/small><\/div><i>+<\/i><div><span>PISTON<\/span><b>Surface pairing<\/b><small>Friction and abrasion<\/small><\/div><i>+<\/i><div><span>FLOW PATH<\/span><b>System materials<\/b><small>Tubing, filters, valves, mixer<\/small><\/div><\/div>\n          <p>A seal can remain chemically stable while another part of the HPLC fluid path does not. Solvent review must therefore extend beyond the pump seal.<\/p>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-ipa\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">04<\/span><div><p>ISOPROPYL ALCOHOL<\/p><h2>HPLC Seals and IPA<\/h2><\/div><\/div>\n          <p>IPA is commonly used for cleaning, flushing, seal wash and normal-phase operation. It can bridge certain polar and nonpolar solvent systems and dissolve many organic residues.<\/p>\n          <div class=\"hsc-bridge\"><article><span>POLAR SIDE<\/span><b>Water-rich residue<\/b><\/article><div><strong>IPA<\/strong><small>COMPATIBILITY BRIDGE<\/small><\/div><article><span>NONPOLAR SIDE<\/span><b>Hexane \/ THF systems<\/b><\/article><\/div>\n          <div class=\"hsc-callout\"><span>CHECK BEFORE USE<\/span><p>Seal material, tubing compatibility, solvent miscibility and instrument-specific wash recommendations. A wash solvent must not precipitate residual mobile phase.<\/p><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-thf\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">05<\/span><div><p>TETRAHYDROFURAN<\/p><h2>HPLC Seals and THF<\/h2><\/div><\/div>\n          <p>THF is one of the most important solvent challenges in HPLC pump-seal selection. It is used in specialized reversed-phase methods, polymer analysis, GPC\/SEC and normal-phase chromatography.<\/p>\n          <div class=\"hsc-solvent-alert\"><div><span>DOCUMENTED CONCERN<\/span><h3>THF can damage UHMWPE piston seals in specified pump configurations.<\/h3><p>Actual risk depends on concentration, exposure duration and the proprietary seal compound.<\/p><\/div><div><span>COMMON ALTERNATIVE<\/span><h3>Carbon-filled or engineered PTFE<\/h3><p>Potentially broader chemistry, but pressure, abrasion and piston compatibility must be rechecked.<\/p><\/div><\/div>\n          <div class=\"hsc-tradeoff-line\"><span>A MATERIAL CHANGE CAN ALTER<\/span><b>Friction<\/b><b>Piston wear<\/b><b>Pressure rating<\/b><b>Biocompatibility<\/b><\/div>\n          <blockquote><p><strong>Do not treat a PTFE conversion as a simple drop-in material substitution without reviewing the complete pump design.<\/strong><\/p><\/blockquote>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-ketones\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">06<\/span><div><p>ACETONE \u00b7 MEK \u00b7 OTHERS<\/p><h2>HPLC Seals and Ketones<\/h2><\/div><\/div>\n          <p>Ketones can be aggressive toward some polyethylene-based pump seals. \u201cOrganic-solvent compatible\u201d is not a universal rating and does not prove resistance to every ketone.<\/p>\n          <div class=\"hsc-review-grid\"><article><span>01<\/span><h3>Check the OEM seal<\/h3><p>Identify the exact material and approved solvent list.<\/p><\/article><article><span>02<\/span><h3>Screen PTFE compounds<\/h3><p>Match filler and chemistry to the ketone exposure.<\/p><\/article><article><span>03<\/span><h3>Confirm pressure limits<\/h3><p>Mechanical capability may change with a new compound.<\/p><\/article><article><span>04<\/span><h3>Review the piston<\/h3><p>Surface pairing influences abrasion and new-seal life.<\/p><\/article><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-hexane\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">07<\/span><div><p>NORMAL PHASE<\/p><h2>HPLC Seals and Hexane<\/h2><\/div><\/div>\n          <p>Hexane is common in normal-phase chromatography, GPC and nonpolar separations. Normal-phase operation can require a different primary seal, wash solvent and transition procedure than an aqueous reversed-phase system.<\/p>\n          <div class=\"hsc-normal-flow\"><div><span>PRIMARY SEAL<\/span><b>Solvent tolerance<\/b><\/div><i>+<\/i><div><span>SEAL WASH<\/span><b>IPA or approved organic wash<\/b><\/div><i>+<\/i><div><span>SYSTEM<\/span><b>Valves, tubing and miscibility<\/b><\/div><\/div>\n          <p>Changing directly between an aqueous system and a hexane-rich system can create miscibility issues even when the primary seal material is acceptable.<\/p>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-aqueous\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">08<\/span><div><p>WATER + SALTS<\/p><h2>Water and Buffer Solutions<\/h2><\/div><\/div>\n          <p>Water itself is manageable for many seal materials, but aqueous mobile phases introduce buffer salts, biological growth, pH extremes and corrosion. \u201cWater-compatible\u201d does not automatically mean \u201cbuffer-compatible.\u201d<\/p>\n          <div class=\"hsc-buffer-process\"><div><span>DISSOLVED BUFFER<\/span><b>Phosphate \u00b7 acetate \u00b7 citrate \u00b7 ammonium salts<\/b><\/div><i>\u2192<\/i><div><span>SOLVENT EVAPORATES<\/span><b>Behind the high-pressure seal<\/b><\/div><i>\u2192<\/i><div class=\"is-crystal\"><span>SALT CRYSTALS<\/span><b>Abrasive particles form<\/b><\/div><i>\u2192<\/i><div class=\"is-damage\"><span>DAMAGE<\/span><b>Scratched piston + worn lip<\/b><\/div><\/div>\n          <div class=\"hsc-five-checks\"><span>BUFFER COMPATIBILITY IS A SYSTEM ISSUE<\/span><div><b>Polymer<\/b><b>Crystallization<\/b><b>Seal wash<\/b><b>Piston surface<\/b><b>Maintenance<\/b><\/div><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-ph\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">09<\/span><div><p>pH EXTREMES<\/p><h2>High-pH and Acidic Mobile Phases<\/h2><\/div><\/div>\n          <div class=\"hsc-ph-scale\"><article class=\"is-acid\"><span>LOW pH<\/span><b>Formic \u00b7 acetic \u00b7 TFA \u00b7 phosphoric<\/b><p>Dilute additives are often tolerated, but the complete polymer and metal flow path must be checked.<\/p><\/article><div><i><\/i><strong>pH<\/strong><i><\/i><\/div><article class=\"is-base\"><span>HIGH pH<\/span><b>Ammonium hydroxide \u00b7 ammonia<\/b><p>Prolonged exposure can shorten the lifetime of certain UHMWPE seals in documented pump families.<\/p><\/article><\/div>\n          <div class=\"hsc-callout is-warning\"><span>BEFORE CHANGING MATERIAL<\/span><p>Confirm compatibility with the piston, pump model and pressure rating. Use OEM-approved high-pH or filled-PTFE options where applicable.<\/p><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-materials\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">10<\/span><div><p>MATERIAL BEHAVIOR<\/p><h2>HPLC Seal Materials in Solvent Service<\/h2><\/div><\/div>\n          <div class=\"hsc-material-stack\">\n            <article class=\"is-ptfe\"><div><span>PTFE<\/span><h3>Broadest chemistry, very low friction<\/h3><\/div><p>Excellent solvent compatibility, but virgin PTFE has creep, moderate wear resistance and lower mechanical strength. Pump seals usually need engineered geometry or fillers.<\/p><ul><li>THF and ketone screening<\/li><li>Low friction<\/li><li>Design-dependent pressure<\/li><\/ul><\/article>\n            <article class=\"is-filled\"><div><span>FILLED PTFE<\/span><h3>Improved wear and dimensional stability<\/h3><\/div><p>Carbon, graphite, glass or polymer fillers can improve wear, pressure resistance and creep behavior while changing abrasion, purity and solvent compatibility.<\/p><ul><li>Harsh-solvent duty<\/li><li>Filler-specific behavior<\/li><li>Piston-wear review<\/li><\/ul><\/article>\n            <article class=\"is-uhmwpe\"><div><span>UHMWPE<\/span><h3>Excellent routine wear performance<\/h3><\/div><p>Combines low friction, toughness and strong sealing performance in many reversed-phase applications, but selected designs have documented limits with THF, ketones and NH\u2084OH.<\/p><ul><li>Routine ACN\/water<\/li><li>Excellent wear<\/li><li>Not universal<\/li><\/ul><\/article>\n            <article class=\"is-peek\"><div><span>PEEK<\/span><h3>High-strength structural polymer<\/h3><\/div><p>Often used in valve parts, support rings, fittings and specialized designs. It is stiffer and generally higher-friction than PTFE, so it is not automatically the best primary piston-seal material.<\/p><ul><li>High mechanical strength<\/li><li>Valve and support roles<\/li><li>Function-specific selection<\/li><\/ul><\/article>\n          <\/div>\n          <div class=\"hsc-elastomer-row\"><article><span>FKM<\/span><p>Good with many oils, hydrocarbons and solvents; limits can include ketones, amines and polar media.<\/p><\/article><article><span>EPDM<\/span><p>Strong candidate for water, aqueous buffers and dilute acids\/bases; poor with many hydrocarbon solvents.<\/p><\/article><article><span>FFKM<\/span><p>Broad resistance at high cost; most relevant to aggressive mixed-media static seals rather than routine pump pistons.<\/p><\/article><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-screening\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">11<\/span><div><p>PRELIMINARY MATRIX<\/p><h2>Quick HPLC Solvent Compatibility Screening Table<\/h2><\/div><\/div>\n          <div class=\"hsc-table-wrap\" role=\"region\" aria-label=\"HPLC solvent screening table\" tabindex=\"0\"><table><thead><tr><th>Mobile phase \/ solvent<\/th><th>UHMWPE<\/th><th>PTFE \/ filled PTFE<\/th><th>Main concern<\/th><\/tr><\/thead><tbody>\n            <tr><td>Water<\/td><td><span class=\"hsc-rating is-good\">Generally suitable<\/span><\/td><td>Excellent<\/td><td>Buffers and microbial growth<\/td><\/tr><tr><td>Methanol<\/td><td><span class=\"hsc-rating is-good\">Generally suitable<\/span><\/td><td>Excellent<\/td><td>Check complete flow path<\/td><\/tr><tr><td>Acetonitrile<\/td><td><span class=\"hsc-rating is-good\">Generally suitable<\/span><\/td><td>Excellent<\/td><td>High-pH additives can change result<\/td><\/tr><tr><td>ACN + NH\u2084OH<\/td><td><span class=\"hsc-rating is-review\">Lifetime concern<\/span><\/td><td>Often preferred for harsh duty<\/td><td>High pH<\/td><\/tr><tr><td>IPA<\/td><td><span class=\"hsc-rating is-good\">Generally suitable<\/span><\/td><td>Excellent<\/td><td>Wash-system compatibility<\/td><\/tr><tr><td>THF<\/td><td><span class=\"hsc-rating is-alert\">Known concern in some seals<\/span><\/td><td>Often better candidate<\/td><td>Swelling or degradation<\/td><\/tr><tr><td>Ketones<\/td><td><span class=\"hsc-rating is-alert\">Known concern in some seals<\/span><\/td><td>Often better candidate<\/td><td>Polymer attack<\/td><\/tr><tr><td>Hexane<\/td><td><span class=\"hsc-rating is-review\">System-dependent<\/span><\/td><td>Good candidate<\/td><td>Normal-phase configuration<\/td><\/tr><tr><td>Aqueous buffers<\/td><td><span class=\"hsc-rating is-good\">Generally suitable<\/span><\/td><td>Generally suitable<\/td><td>Salt crystallization<\/td><\/tr><tr><td>High-pH phase<\/td><td><span class=\"hsc-rating is-review\">Grade-dependent<\/span><\/td><td>Often stronger candidate<\/td><td>Seal lifetime<\/td><\/tr><tr><td>Dilute acidic phase<\/td><td><span class=\"hsc-rating is-good\">Often suitable<\/span><\/td><td>Excellent<\/td><td>Complete flow-path compatibility<\/td><\/tr>\n          <\/tbody><\/table><\/div>\n          <p class=\"hsc-table-note\">Instrument manufacturer requirements take priority over this preliminary screening matrix.<\/p>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-wash\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">12<\/span><div><p>SECONDARY FLUID<\/p><h2>Seal-Wash Solvent Compatibility<\/h2><\/div><\/div>\n          <p>Primary-seal compatibility and seal-wash compatibility are different questions. The wash must dissolve leaked mobile phase, remove buffer residue, remain system-compatible and avoid precipitation.<\/p>\n          <div class=\"hsc-wash-grid\"><article><span>REVERSED PHASE<\/span><h3>Aqueous wash + modest organic content<\/h3><div><b>90\/10<\/b><small>Water \/ methanol example<\/small><\/div><div><b>80\/20<\/b><small>Water \/ MeOH or ACN examples<\/small><\/div><p>Follow the specific instrument manual and application requirements.<\/p><\/article><article><span>NORMAL PHASE<\/span><h3>Compatible organic wash<\/h3><div class=\"is-wide\"><b>IPA<\/b><small>Common option for selected hexane or THF systems<\/small><\/div><p>Verify miscibility with the mobile phase and every wash-path component.<\/p><\/article><\/div>\n          <div class=\"hsc-callout\"><span>DO NOT USE<\/span><p>Nonvolatile buffer salts as seal wash. They can damage or clog wash-path components.<\/p><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-precipitation\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">13<\/span><div><p>PRECIPITATION CONTROL<\/p><h2>Why Seal Wash Must Never Precipitate the Mobile Phase<\/h2><\/div><\/div>\n          <p>If an organic-rich wash contacts a water-soluble buffer with poor organic solubility, salt can precipitate directly where the piston and seal need a clean lubricated interface.<\/p>\n          <div class=\"hsc-precip-visual\"><div><span>BUFFERED MOBILE PHASE<\/span><i class=\"hsc-droplet\"><\/i><b>Dissolved salt<\/b><\/div><em>+<\/em><div><span>INCOMPATIBLE WASH<\/span><i class=\"hsc-droplet is-organic\"><\/i><b>Organic-rich wash<\/b><\/div><em>\u2192<\/em><div class=\"is-crystals\"><span>PRECIPITATION<\/span><i><b><\/b><b><\/b><b><\/b><b><\/b><\/i><strong>Hard salt particles<\/strong><\/div><em>\u2192<\/em><div class=\"is-damage\"><span>MECHANICAL DAMAGE<\/span><i><\/i><strong>Scratched piston + seal wear<\/strong><\/div><\/div>\n          <blockquote><p><strong>Where the mobile phase contains water-soluble salts, an aqueous-based seal wash can help prevent crystals from becoming friction agents.<\/strong><\/p><\/blockquote>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-failures\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">14<\/span><div><p>FIELD DIAGNOSIS<\/p><h2>Common Solvent-Related Seal Failure Symptoms<\/h2><\/div><\/div>\n          <div class=\"hsc-failure-grid\"><article><span>01<\/span><h3>Swelling<\/h3><p>Dimensions increase, friction rises and removal becomes difficult.<\/p><small>Solvent incompatibility \u00b7 incorrect polymer<\/small><\/article><article><span>02<\/span><h3>Softening<\/h3><p>Seal deforms, extrudes or begins leaking under pressure.<\/p><small>Polymer attack \u00b7 long exposure<\/small><\/article><article><span>03<\/span><h3>Excessive wear<\/h3><p>Lip material disappears faster than the expected interval.<\/p><small>Wrong material \u00b7 deposits \u00b7 pressure \u00b7 rough piston<\/small><\/article><article><span>04<\/span><h3>Salt deposits<\/h3><p>Crystals collect behind the primary seal and abrade the interface.<\/p><small>Buffer \u00b7 ineffective wash \u00b7 dry wash path<\/small><\/article><article><span>05<\/span><h3>Pressure instability<\/h3><p>Flow repeatability falls or the pump struggles to hold pressure.<\/p><small>Worn seal \u00b7 deformation \u00b7 valves \u00b7 air<\/small><\/article><\/div>\n          <p>Solvent compatibility should be investigated together with piston condition, check valves, installation and the complete mechanical pump state.<\/p>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-pressure\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">15<\/span><div><p>COUPLED LOADS<\/p><h2>How Solvent Compatibility Changes With Pressure<\/h2><\/div><\/div>\n          <p>Immersion charts do not reproduce mechanical compression, reciprocating motion, high contact stress and extrusion gaps. Moderate swelling can become premature failure when pressure and dynamic wear are added.<\/p>\n          <div class=\"hsc-pressure-stage\"><div><span>CHEMICAL EFFECT<\/span><b>Swelling or softening<\/b><small>May look moderate in a beaker<\/small><\/div><i>\u00d7<\/i><div><span>DYNAMIC EFFECT<\/span><b>Friction + millions of cycles<\/b><small>Generates wear and heat<\/small><\/div><i>\u00d7<\/i><div><span>PRESSURE EFFECT<\/span><b>Extrusion force<\/b><small>Loads the lip and clearance<\/small><\/div><i>=<\/i><div class=\"is-result\"><span>ACTUAL LIFE<\/span><b>Pump-specific outcome<\/b><small>Cannot be predicted independently<\/small><\/div><\/div>\n          <div class=\"hsc-pressure-compare\"><article><span>HPLC EXAMPLE<\/span><strong>200 bar<\/strong><i><\/i><p>Material may provide acceptable wear and extrusion control.<\/p><\/article><article><span>UHPLC EXAMPLE<\/span><strong>1,000 bar<\/strong><i><\/i><p>The same chemistry can produce unacceptable mechanical life.<\/p><\/article><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-uhplc\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">16<\/span><div><p>SAME CHEMISTRY \u00b7 GREATER STRESS<\/p><h2>HPLC vs UHPLC Solvent Compatibility<\/h2><\/div><\/div>\n          <p>UHPLC usually creates higher contact stress, stronger extrusion forces, tighter clearances and more demanding leakage limits. The most chemically resistant polymer is not automatically the longest-lasting UHPLC seal.<\/p>\n          <div class=\"hsc-balance\"><span>THE UHPLC BALANCE<\/span><div><article><b>01<\/b><p>Chemical compatibility<\/p><\/article><article><b>02<\/b><p>Mechanical strength<\/p><\/article><article><b>03<\/b><p>Wear resistance<\/p><\/article><article><b>04<\/b><p>Low friction<\/p><\/article><article><b>05<\/b><p>Pressure stability<\/p><\/article><\/div><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-selection\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">17<\/span><div><p>NEW METHOD WORKFLOW<\/p><h2>How to Select an HPLC Seal for a New Mobile Phase<\/h2><\/div><\/div>\n          <div class=\"hsc-steps\"><article><span>01<\/span><div><h3>List every solvent<\/h3><p>Give percentages and do not omit minor components.<\/p><\/div><\/article><article><span>02<\/span><div><h3>Include the full gradient<\/h3><p>Both 5% and 95% organic endpoints matter.<\/p><\/div><\/article><article><span>03<\/span><div><h3>List pH modifiers<\/h3><p>Formic acid, TFA, NH\u2084OH and other additives.<\/p><\/div><\/article><article><span>04<\/span><div><h3>Define buffer salts<\/h3><p>Chemical name and concentration.<\/p><\/div><\/article><article><span>05<\/span><div><h3>Provide pressure<\/h3><p>Normal and maximum operating values.<\/p><\/div><\/article><article><span>06<\/span><div><h3>Identify the pump model<\/h3><p>Seal, piston coating and limits are pump-specific.<\/p><\/div><\/article><article><span>07<\/span><div><h3>Validate the seal wash<\/h3><p>Dissolve residue without precipitating salts.<\/p><\/div><\/article><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-specification\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">18<\/span><div><p>CUSTOM-SEAL INPUTS<\/p><h2>Information Required for a Custom HPLC Seal<\/h2><\/div><\/div>\n          <div class=\"hsc-table-wrap\" role=\"region\" aria-label=\"Custom HPLC seal information\" tabindex=\"0\"><table><thead><tr><th>Parameter<\/th><th>Information required<\/th><th>Engineering use<\/th><\/tr><\/thead><tbody><tr><td>Instrument<\/td><td>Manufacturer and model<\/td><td>Identifies platform constraints<\/td><\/tr><tr><td>Pump model<\/td><td>Exact designation if available<\/td><td>Links seal and piston pairing<\/td><\/tr><tr><td>System<\/td><td>HPLC or UHPLC<\/td><td>Defines pressure class<\/td><\/tr><tr><td>Seal type<\/td><td>Piston, plunger, wash or valve<\/td><td>Defines movement and geometry<\/td><\/tr><tr><td>Mobile phase A<\/td><td>Complete formulation<\/td><td>Establishes chemistry endpoint<\/td><\/tr><tr><td>Mobile phase B<\/td><td>Complete formulation<\/td><td>Establishes chemistry endpoint<\/td><\/tr><tr><td>Gradient<\/td><td>Composition range<\/td><td>Captures every exposure state<\/td><\/tr><tr><td>Additives<\/td><td>Acids, bases and modifiers<\/td><td>Reveals hidden compatibility risks<\/td><\/tr><tr><td>Buffers<\/td><td>Type and concentration<\/td><td>Predicts crystallization risk<\/td><\/tr><tr><td>Pressure<\/td><td>Normal and maximum<\/td><td>Defines extrusion and contact load<\/td><\/tr><tr><td>Temperature<\/td><td>Normal and maximum<\/td><td>Controls aging rate<\/td><\/tr><tr><td>Piston<\/td><td>Material, coating and diameter<\/td><td>Controls mating-surface behavior<\/td><\/tr><tr><td>Current seal<\/td><td>Material if known<\/td><td>Provides the baseline design<\/td><\/tr><tr><td>Failure mode<\/td><td>Leakage, wear or swelling<\/td><td>Supports root-cause analysis<\/td><\/tr><tr><td>Service life<\/td><td>Current and target<\/td><td>Defines the improvement goal<\/td><\/tr><\/tbody><\/table><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-mistakes\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">19<\/span><div><p>AVOIDABLE ERRORS<\/p><h2>Common HPLC Seal Selection Mistakes<\/h2><\/div><\/div>\n          <div class=\"hsc-mistake-list\"><article><b>01<\/b><div><h3>Selecting by solvent name alone<\/h3><p>Water content, gradient endpoints, buffers and pH modifiers can change the result.<\/p><\/div><\/article><article><b>02<\/b><div><h3>Assuming PTFE is always better<\/h3><p>Broader chemistry may come with different abrasion, pressure and piston requirements.<\/p><\/div><\/article><article><b>03<\/b><div><h3>Treating all polyethylene as identical<\/h3><p>PE, UHMWPE and proprietary compounds have different behavior.<\/p><\/div><\/article><article><b>04<\/b><div><h3>Ignoring the seal wash<\/h3><p>An incompatible wash can destroy an otherwise suitable primary seal.<\/p><\/div><\/article><article><b>05<\/b><div><h3>Ignoring buffer precipitation<\/h3><p>The polymer can be compatible while salt crystals mechanically abrade it.<\/p><\/div><\/article><article><b>06<\/b><div><h3>Changing material without checking the piston<\/h3><p>The previous seal and piston pairing can influence the life of a replacement compound.<\/p><\/div><\/article><article><b>07<\/b><div><h3>Looking only at chemical resistance<\/h3><p>Pressure, wear, friction, extrusion and geometry are equally important.<\/p><\/div><\/article><\/div>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-troubleshooting\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">20<\/span><div><p>PRACTICAL EXAMPLE<\/p><h2>Troubleshooting a High-pH HILIC Seal Problem<\/h2><\/div><\/div>\n          <div class=\"hsc-case-head\"><div><span>MOBILE PHASE<\/span><b>90% ACN \/ 10% H\u2082O + NH\u2084OH<\/b><\/div><div><span>SYMPTOMS<\/span><b>Short seal life \u00b7 small leaks \u00b7 pressure variation<\/b><\/div><\/div>\n          <div class=\"hsc-case-steps\"><article><span>01<\/span><p>Confirm pump model and current seal material.<\/p><\/article><article><span>02<\/span><p>Check whether UHMWPE is approved for this formulation.<\/p><\/article><article><span>03<\/span><p>Review ammonium-hydroxide concentration.<\/p><\/article><article><span>04<\/span><p>Inspect pistons for scratches or coating damage.<\/p><\/article><article><span>05<\/span><p>Verify that the seal-wash system is operating.<\/p><\/article><article><span>06<\/span><p>Screen an OEM-approved filled-PTFE option.<\/p><\/article><article><span>07<\/span><p>Reconfirm pressure rating after the material change.<\/p><\/article><\/div>\n          <blockquote><p><strong>This process is more reliable than simply ordering \u201ca more chemical-resistant seal.\u201d<\/strong><\/p><\/blockquote>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-summary\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">21<\/span><div><p>FINAL DECISION<\/p><h2>Engineering Summary<\/h2><\/div><\/div>\n          <p>A successful HPLC or UHPLC pump seal must combine chemical resistance, low friction, wear resistance, pressure capability and dimensional stability in the actual pump.<\/p>\n          <div class=\"hsc-summary-grid\"><article><span>FORMULATION<\/span><h3>List every component<\/h3><p>Mobile phases, gradients, pH modifiers and buffers.<\/p><\/article><article><span>MECHANICS<\/span><h3>Define the load<\/h3><p>Pressure, piston, speed, cycle count and temperature.<\/p><\/article><article><span>WASH SYSTEM<\/span><h3>Control deposits<\/h3><p>Dissolve residue and prevent salt crystallization.<\/p><\/article><article><span>VALIDATION<\/span><h3>Respect the pump design<\/h3><p>Use approved material, geometry and piston pairing.<\/p><\/article><\/div>\n          <blockquote><p><strong>The best solution is the material and geometry that provide adequate solvent compatibility and reliable mechanical performance together.<\/strong><\/p><\/blockquote>\n        <\/section>\n\n        <section class=\"hsc-section\" id=\"hsc-faq\">\n          <div class=\"hsc-section-heading\"><span class=\"hsc-section-index\">22<\/span><div><p>QUICK ANSWERS<\/p><h2>Frequently Asked Questions<\/h2><\/div><\/div>\n          <div class=\"hsc-faq-list\">\n            <div class=\"hsc-faq-item\"><button type=\"button\" aria-expanded=\"false\"><span>Are HPLC seals resistant to acetonitrile?<\/span><i><\/i><\/button><div class=\"hsc-faq-answer\"><p>Many reversed-phase seals are designed for ACN\/water. High-pH additives such as ammonium hydroxide can change compatibility and shorten the life of some UHMWPE seals.<\/p><\/div><\/div>\n            <div class=\"hsc-faq-item\"><button type=\"button\" aria-expanded=\"false\"><span>Are HPLC pump seals resistant to methanol?<\/span><i><\/i><\/button><div class=\"hsc-faq-answer\"><p>Many standard materials are suitable for methanol, but the complete flow path should be reviewed, especially with anhydrous methanol or acidic modifiers.<\/p><\/div><\/div>\n            <div class=\"hsc-faq-item\"><button type=\"button\" aria-expanded=\"false\"><span>Can UHMWPE seals be used with THF?<\/span><i><\/i><\/button><div class=\"hsc-faq-answer\"><p>Some manufacturers specifically warn that THF can damage their UHMWPE piston seals. An approved PTFE-based alternative may be required for compatible pump configurations.<\/p><\/div><\/div>\n            <div class=\"hsc-faq-item\"><button type=\"button\" aria-expanded=\"false\"><span>Is PTFE the best material for HPLC seals?<\/span><i><\/i><\/button><div class=\"hsc-faq-answer\"><p>Not always. PTFE offers broad chemistry and low friction, while UHMWPE can offer excellent wear in routine duty. The pump, solvent and pressure determine the best balance.<\/p><\/div><\/div>\n            <div class=\"hsc-faq-item\"><button type=\"button\" aria-expanded=\"false\"><span>Can HPLC seals be used with hexane?<\/span><i><\/i><\/button><div class=\"hsc-faq-answer\"><p>Yes, depending on the pump and seal. Normal-phase systems may require dedicated materials, compatible wash solvents and careful solvent-transition procedures.<\/p><\/div><\/div>\n            <div class=\"hsc-faq-item\"><button type=\"button\" aria-expanded=\"false\"><span>Can buffers damage HPLC pump seals?<\/span><i><\/i><\/button><div class=\"hsc-faq-answer\"><p>Yes. Dried salts can form abrasive deposits on the piston and accelerate wear even when the seal polymer is chemically compatible.<\/p><\/div><\/div>\n            <div class=\"hsc-faq-item\"><button type=\"button\" aria-expanded=\"false\"><span>What seal material should be used with ammonium hydroxide?<\/span><i><\/i><\/button><div class=\"hsc-faq-answer\"><p>It depends on the pump. Some UHMWPE seals have documented concerns, while OEM-approved filled-PTFE alternatives may be available.<\/p><\/div><\/div>\n            <div class=\"hsc-faq-item\"><button type=\"button\" aria-expanded=\"false\"><span>What is the best seal wash for reversed-phase HPLC?<\/span><i><\/i><\/button><div class=\"hsc-faq-answer\"><p>Follow the instrument manual. Aqueous wash with a modest organic component is common for many reversed-phase applications.<\/p><\/div><\/div>\n            <div class=\"hsc-faq-item\"><button type=\"button\" aria-expanded=\"false\"><span>What is the best seal wash for THF or normal-phase solvents?<\/span><i><\/i><\/button><div class=\"hsc-faq-answer\"><p>IPA or another compatible organic wash may be recommended, depending on the instrument and mobile-phase miscibility.<\/p><\/div><\/div>\n            <div class=\"hsc-faq-item\"><button type=\"button\" aria-expanded=\"false\"><span>Why does a chemically compatible HPLC seal still fail?<\/span><i><\/i><\/button><div class=\"hsc-faq-answer\"><p>High pressure, piston damage, salt crystals, poor seal wash, installation, friction and geometry can all cause failure despite acceptable chemical resistance.<\/p><\/div><\/div>\n          <\/div>\n        <\/section>\n\n        <section class=\"hsc-contact\" id=\"hsc-contact\">\n          <div class=\"hsc-contact-copy\"><span>APPLICATION-SPECIFIC REVIEW<\/span><h2>Need Help Selecting an HPLC Seal for Your Solvent System?<\/h2><p>Send the full mobile-phase and pump specification. Walle Seals can review solvent compatibility, pressure, piston pairing and seal geometry together.<\/p><a class=\"hsc-button hsc-button-primary\" href=\"\/contact-us\/\">Discuss your application <b>\u2192<\/b><\/a><\/div>\n          <div class=\"hsc-contact-spec\"><span>INCLUDE WITH YOUR REQUEST<\/span><ul><li>Instrument and pump model<\/li><li>Complete mobile phases A and B<\/li><li>Gradient, buffers and modifiers<\/li><li>Normal and maximum pressure<\/li><li>Piston material and diameter<\/li><li>Current seal and failure symptoms<\/li><li>Current and target service life<\/li><\/ul><\/div>\n        <\/section>\n      <\/article>\n    <\/main>\n  <\/div>\n\n  <button class=\"hsc-back-top\" type=\"button\" data-hsc-back-top aria-label=\"Back to top\"><span>\u2191<\/span><\/button>\n<\/div>\n  <script>\n\/* WordPress JavaScript \u6a21\u5757\uff1a\u590d\u5236\u672c\u6587\u4ef6\u5168\u90e8\u5185\u5bb9\uff0c\u4e0d\u8981\u6dfb\u52a0 script \u6807\u7b7e\uff1b\u65e0\u9700 jQuery\u3002 *\/\n(function () {\n  \"use strict\";\n\n  function init(root) {\n    if (!root) return;\n    if (root.dataset.hscReady === \"true\") return;\n    root.dataset.hscReady = \"true\";\n\n    var article = root.querySelector(\"[data-hsc-article]\");\n    var progress = root.querySelector(\"[data-hsc-progress]\");\n    var backTop = root.querySelector(\"[data-hsc-back-top]\");\n    var toc = root.querySelector(\"[data-hsc-toc]\");\n    var toggle = root.querySelector(\"[data-hsc-toc-toggle]\");\n    var shell = root.querySelector(\"[data-hsc-shell]\");\n    var sidebar = root.querySelector(\"[data-hsc-sidebar]\");\n    var card = root.querySelector(\"[data-hsc-sidebar-card]\");\n    var links = toc ? 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Screen the mobile phase \u2193 Open the specification list 11solvent environments [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7075,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[85,106],"tags":[],"class_list":["post-7074","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-materials-compatibility"],"_links":{"self":[{"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/posts\/7074","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/comments?post=7074"}],"version-history":[{"count":1,"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/posts\/7074\/revisions"}],"predecessor-version":[{"id":7076,"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/posts\/7074\/revisions\/7076"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/media\/7075"}],"wp:attachment":[{"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/media?parent=7074"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/categories?post=7074"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/tags?post=7074"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}