{"id":5782,"date":"2026-08-05T17:10:46","date_gmt":"2026-08-05T09:10:46","guid":{"rendered":"https:\/\/walleglobal.com\/?p=5782"},"modified":"2026-08-18T14:11:39","modified_gmt":"2026-08-18T06:11:39","slug":"ffkm-seals-semiconductor-manufacturing","status":"publish","type":"post","link":"https:\/\/walleglobal.com\/de\/2026\/08\/ffkm-seals-semiconductor-manufacturing\/","title":{"rendered":"FFKM-Dichtungen f\u00fcr die Halbleiterfertigung: Plasmabest\u00e4ndigkeit, Vakuum und Kontaminationskontrolle"},"content":{"rendered":"\n<style data-wp-block-html=\"css\">\n\/* WordPress CSS \u6a21\u5757\uff1a\u590d\u5236\u672c\u6587\u4ef6\u5168\u90e8\u5185\u5bb9\uff0c\u4e0d\u8981\u6dfb\u52a0 <style> \u6807\u7b7e\u3002 *\/\n.wpsc-page,.wpsc-page 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cx=\"405\" cy=\"128\" r=\"4\"\/><circle cx=\"454\" cy=\"148\" r=\"5\"\/>\n    <\/g>\n    <g transform=\"translate(67 413)\">\n      <rect width=\"188\" height=\"90\" rx=\"20\" fill=\"#0a1b31\" stroke=\"#294564\"\/>\n      <text x=\"20\" y=\"31\" fill=\"#7f96ad\" font-size=\"12\" letter-spacing=\"1.8\">PROCESS WINDOW<\/text>\n      <text x=\"20\" y=\"61\" fill=\"#fff\" font-size=\"20\" font-weight=\"800\">Plasma + Vacuum<\/text>\n      <text x=\"20\" y=\"81\" fill=\"#ff8a63\" font-size=\"13\">Purity under pressure<\/text>\n    <\/g>\n    <g transform=\"translate(456 414)\">\n      <circle cx=\"68\" cy=\"44\" r=\"43\" fill=\"#0a1b31\" stroke=\"#294564\"\/>\n      <circle cx=\"68\" cy=\"44\" r=\"27\" fill=\"none\" stroke=\"#ff714c\" stroke-width=\"12\"\/>\n      <text x=\"68\" y=\"103\" text-anchor=\"middle\" fill=\"#9bb0c5\" font-size=\"12\" letter-spacing=\"1.4\">FFKM SEAL<\/text>\n    <\/g>\n  <\/svg>\n<\/div>\n    <\/div>\n  <\/header>\n\n  <div class=\"wpsc-content-shell\" data-wpsc-shell>\n    <aside class=\"wpsc-sidebar\" data-wpsc-sidebar aria-label=\"Article navigation\">\n      <div class=\"wpsc-sidebar-card\" data-wpsc-sidebar-card>\n        <div class=\"wpsc-sidebar-title\"><span>On this page<\/span><button type=\"button\" data-wpsc-toc-toggle aria-expanded=\"false\">Contents <b>+<\/b><\/button><\/div>\n        <nav class=\"wpsc-toc\" data-wpsc-toc><a href=\"#wpsc-why-are-seals-critical-in-semiconductor-equipment\"><span>01<\/span><em>Why Are Seals Critical in Semiconductor Equipment?<\/em><\/a>\n<a href=\"#wpsc-why-is-ffkm-used-in-semiconductor-manufacturing\"><span>02<\/span><em>Why Is FFKM Used in Semiconductor Manufacturing?<\/em><\/a>\n<a href=\"#wpsc-semiconductor-processes-have-different-sealing-requirements\"><span>03<\/span><em>Semiconductor Processes Have Different Sealing Requirements<\/em><\/a>\n<a href=\"#wpsc-ffkm-seals-in-plasma-processes\"><span>04<\/span><em>FFKM Seals in Plasma Processes<\/em><\/a>\n<a href=\"#wpsc-plasma-erosion-is-not-the-only-concern\"><span>05<\/span><em>Plasma Erosion Is Not the Only Concern<\/em><\/a>\n<a href=\"#wpsc-how-ffkm-fillers-affect-particle-generation\"><span>06<\/span><em>How FFKM Fillers Affect Particle Generation<\/em><\/a>\n<a href=\"#wpsc-particle-contamination-control\"><span>07<\/span><em>Particle Contamination Control<\/em><\/a>\n<a href=\"#wpsc-trace-metal-contamination\"><span>08<\/span><em>Trace-Metal Contamination<\/em><\/a>\n<a href=\"#wpsc-outgassing-in-high-vacuum\"><span>09<\/span><em>Outgassing in High Vacuum<\/em><\/a>\n<a href=\"#wpsc-permeation-and-vacuum-seal-stability\"><span>10<\/span><em>Permeation and Vacuum Seal Stability<\/em><\/a>\n<a href=\"#wpsc-compression-set-and-thermal-stability\"><span>11<\/span><em>Compression Set and Thermal Stability<\/em><\/a>\n<a href=\"#wpsc-wet-process-semiconductor-seals\"><span>12<\/span><em>Wet-Process Semiconductor Seals<\/em><\/a>\n<a href=\"#wpsc-cleanroom-manufacturing-and-packaging\"><span>13<\/span><em>Cleanroom Manufacturing and Packaging<\/em><\/a>\n<a href=\"#wpsc-static-vs-dynamic-semiconductor-seals\"><span>14<\/span><em>Static vs Dynamic Semiconductor Seals<\/em><\/a>\n<a href=\"#wpsc-common-semiconductor-ffkm-failure-modes\"><span>15<\/span><em>Common Semiconductor FFKM Failure Modes<\/em><\/a>\n<a href=\"#wpsc-how-to-select-a-semiconductor-ffkm-compound\"><span>16<\/span><em>How to Select a Semiconductor FFKM Compound<\/em><\/a>\n<a href=\"#wpsc-semiconductor-ffkm-rfq-checklist\"><span>17<\/span><em>Semiconductor FFKM RFQ Checklist<\/em><\/a>\n<a href=\"#wpsc-total-cost-of-ownership\"><span>18<\/span><em>Total Cost of Ownership<\/em><\/a>\n<a href=\"#wpsc-common-selection-mistakes\"><span>19<\/span><em>Common Selection Mistakes<\/em><\/a>\n<a href=\"#wpsc-conclusion\"><span>20<\/span><em>Conclusion<\/em><\/a>\n<a href=\"#wpsc-frequently-asked-questions\"><span>21<\/span><em>Frequently Asked Questions<\/em><\/a>\n<a href=\"#wpsc-need-a-custom-semiconductor-ffkm-seal\"><span>22<\/span><em>Need a Custom Semiconductor FFKM Seal?<\/em><\/a><\/nav>\n        <div class=\"wpsc-sidebar-note\"><span>Key principle<\/span><p>Select by the actual process recipe, vacuum, temperature, movement and contamination limits\u2014not by \u201cFFKM\u201d alone.<\/p><\/div>\n      <\/div>\n    <\/aside>\n\n    <main class=\"wpsc-main\" data-wpsc-main>\n      <article class=\"wpsc-article\" data-wpsc-article>\n        <section class=\"wpsc-intro\"><div class=\"wpsc-tags\"><span>FFKM Seals<\/span><span>Semiconductor Seals<\/span><span>Plasma Seals<\/span><span>Vacuum Seals<\/span><\/div><p>Semiconductor manufacturing exposes seals to a combination of aggressive plasma, reactive process gases, high vacuum, elevated temperatures and strict contamination limits.<\/p>\n<p>A seal must do more than prevent leakage. It may also need to resist plasma erosion, retain sealing force during thermal cycling and minimize the release of particles, trace metals, extractables and volatile compounds.<\/p>\n<p>For these reasons, perfluoroelastomer\u2014commonly identified by the ASTM designation <strong>FFKM<\/strong>\u2014is widely used in critical semiconductor manufacturing equipment.<\/p>\n<p>However, not every FFKM compound is suitable for every semiconductor process.<\/p>\n<p>A formulation developed for fluorine plasma may behave differently in oxygen plasma. A compound optimized for extreme heat may not provide the lowest outgassing. A mineral-filled FFKM may resist erosion but release unacceptable particles after the surrounding polymer is attacked.<\/p>\n<p>The key principle is:<\/p>\n<blockquote>\n<p><strong>Semiconductor FFKM seals should be selected according to the specific process chemistry, plasma type, vacuum level, temperature, seal movement and contamination limits\u2014not by material name alone.<\/strong><\/p>\n<\/blockquote>\n<p>This guide explains how FFKM seals are selected for semiconductor plasma, vacuum and wet-processing applications, and which properties equipment manufacturers and fabrication facilities should evaluate.<\/p>\n<\/section>\n        <section class=\"wpsc-section\" id=\"wpsc-why-are-seals-critical-in-semiconductor-equipment-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">01<\/span><h2 id=\"wpsc-why-are-seals-critical-in-semiconductor-equipment\">Why Are Seals Critical in Semiconductor Equipment?<\/h2><\/div>\n<figure class=\"wpsc-visual wpsc-equipment-visual\">\n  <div class=\"wpsc-visual-head\"><span>Equipment map<\/span><strong>Small seals protect high-value process zones<\/strong><\/div>\n  <svg viewBox=\"0 0 900 410\" role=\"img\" aria-label=\"Semiconductor chamber equipment sealing locations\">\n    <defs><linearGradient id=\"wpsc-chamber\" x1=\"0\" x2=\"1\"><stop stop-color=\"#142b46\"\/><stop offset=\"1\" stop-color=\"#091727\"\/><\/linearGradient><\/defs>\n    <rect x=\"238\" y=\"70\" width=\"424\" height=\"268\" rx=\"72\" fill=\"url(#wpsc-chamber)\" stroke=\"#496784\" stroke-width=\"5\"\/>\n    <ellipse cx=\"450\" cy=\"214\" rx=\"130\" ry=\"70\" fill=\"#1b3150\" stroke=\"#42d8ff\" stroke-width=\"4\"\/>\n    <ellipse cx=\"450\" cy=\"232\" rx=\"92\" ry=\"38\" fill=\"#6e79ff\" opacity=\".8\"\/>\n    <path d=\"M270 102H630M270 306H630\" stroke=\"#ff744f\" stroke-width=\"11\" stroke-linecap=\"round\"\/>\n    <g fill=\"#fff\" font-size=\"14\" font-weight=\"700\">\n      <text x=\"32\" y=\"72\">Chamber lid<\/text><text x=\"35\" y=\"170\">Gas manifold<\/text><text x=\"32\" y=\"278\">Gate valve<\/text>\n      <text x=\"706\" y=\"72\">Showerhead<\/text><text x=\"706\" y=\"170\">Vacuum port<\/text><text x=\"706\" y=\"278\">Pump connection<\/text>\n    <\/g>\n    <g stroke=\"#6f91b2\" stroke-width=\"2\" fill=\"none\"><path d=\"M130 68H230L286 105\"\/><path d=\"M130 166H240L311 177\"\/><path d=\"M130 274H236L286 292\"\/><path d=\"M704 68H670L613 110\"\/><path d=\"M704 166H670L622 198\"\/><path d=\"M704 274H665L614 286\"\/><\/g>\n    <g fill=\"#ff744f\"><circle cx=\"286\" cy=\"105\" r=\"7\"\/><circle cx=\"311\" cy=\"177\" r=\"7\"\/><circle cx=\"286\" cy=\"292\" r=\"7\"\/><circle cx=\"613\" cy=\"110\" r=\"7\"\/><circle cx=\"622\" cy=\"198\" r=\"7\"\/><circle cx=\"614\" cy=\"286\" r=\"7\"\/><\/g>\n  <\/svg>\n  <figcaption>Seal performance can influence vacuum stability, chamber cleanliness, uptime, repeatability and yield.<\/figcaption>\n<\/figure><p>Seals are used throughout wafer-processing equipment, including:<\/p>\n<ul>\n<li>Process chamber lids<\/li>\n<li>Slit and gate valves<\/li>\n<li>Gas inlet systems<\/li>\n<li>Showerheads and gas manifolds<\/li>\n<li>Isolation valves<\/li>\n<li>Vacuum forelines<\/li>\n<li>Chamber doors<\/li>\n<li>Pump connections<\/li>\n<li>Wafer-transfer systems<\/li>\n<li>Chemical containers<\/li>\n<li>Flow controllers<\/li>\n<li>Filters and connectors<\/li>\n<li>Wet-processing valves and fittings<\/li>\n<\/ul>\n<p>Although these components may represent a small portion of the equipment cost, their performance can affect:<\/p>\n<ul>\n<li>Vacuum stability<\/li>\n<li>Process-gas containment<\/li>\n<li>Chamber cleanliness<\/li>\n<li>Equipment uptime<\/li>\n<li>Preventive-maintenance intervals<\/li>\n<li>Wafer contamination<\/li>\n<li>Process repeatability<\/li>\n<li>Yield<\/li>\n<\/ul>\n<p>DuPont identifies particulate contamination, outgassing and extractables caused by seal deterioration as important concerns in semiconductor production. Its semiconductor sealing guidance covers etching, deposition, ashing, oxidation, diffusion and wet processes.<\/p>\n<p>A seal that continues to prevent visible leakage may still be unsuitable if its surface is eroding or releasing contamination into the process chamber.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-why-is-ffkm-used-in-semiconductor-manufacturing-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">02<\/span><h2 id=\"wpsc-why-is-ffkm-used-in-semiconductor-manufacturing\">Why Is FFKM Used in Semiconductor Manufacturing?<\/h2><\/div><p>FFKM has a highly fluorinated polymer structure that generally provides broader resistance to heat, chemicals and plasma environments than conventional elastomers such as FKM and silicone.<\/p>\n<p>Semiconductor-specific FFKM compounds may be engineered to provide:<\/p>\n<ul>\n<li>Low plasma erosion<\/li>\n<li>Low particle generation<\/li>\n<li>Low trace-metal content<\/li>\n<li>Low outgassing<\/li>\n<li>Low extractables<\/li>\n<li>High-temperature stability<\/li>\n<li>Low compression set<\/li>\n<li>Broad wet-chemical resistance<\/li>\n<li>Reliable sealing under vacuum<\/li>\n<li>Controlled cleanroom manufacturing and packaging<\/li>\n<\/ul>\n<p>Trelleborg describes semiconductor-grade FFKM materials as combining high purity, very low trace-metal content, plasma resistance, reduced particle generation and ultra-low outgassing in high-vacuum conditions.<\/p>\n<p>These properties make FFKM an important option for both front-end wafer-processing equipment and the fluid-delivery systems that support it.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-semiconductor-processes-have-different-sealing-requirements-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">03<\/span><h2 id=\"wpsc-semiconductor-processes-have-different-sealing-requirements\">Semiconductor Processes Have Different Sealing Requirements<\/h2><\/div>\n<figure class=\"wpsc-visual wpsc-process-visual\">\n  <div class=\"wpsc-visual-head\"><span>Process landscape<\/span><strong>Three process families, three different priorities<\/strong><\/div>\n  <div class=\"wpsc-process-grid\">\n    <div><span class=\"wpsc-process-icon\">\u26a1<\/span><b>Plasma &amp; dry<\/b><p>Erosion, particles, plasma chemistry and dynamic wear.<\/p><small>ETCH \u00b7 PECVD \u00b7 ASH<\/small><\/div>\n    <div><span class=\"wpsc-process-icon\">\u25c9<\/span><b>Vacuum &amp; thermal<\/b><p>Outgassing, permeation, compression set and heat.<\/p><small>PVD \u00b7 ALD \u00b7 DIFFUSION<\/small><\/div>\n    <div><span class=\"wpsc-process-icon\">\u25c7<\/span><b>Wet chemical<\/b><p>Compatibility, extractables, ions and trace metals.<\/p><small>CLEAN \u00b7 STRIP \u00b7 PLATE<\/small><\/div>\n  <\/div>\n  <figcaption>A compound qualified for one process family should not be assumed suitable for the others.<\/figcaption>\n<\/figure><p>Semiconductor seal selection can be divided into three broad process groups:<\/p>\n<ol>\n<li>Plasma and dry processes<\/li>\n<li>Vacuum and thermal processes<\/li>\n<li>Wet chemical processes<\/li>\n<\/ol>\n<p>A compound that performs well in one group should not automatically be approved for another.<\/p>\n<table>\n<thead>\n<tr>\n<th>Process environment<\/th>\n<th>Main seal requirements<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Plasma etching<\/td>\n<td>Plasma resistance, low erosion and low particles<\/td>\n<\/tr>\n<tr>\n<td>CVD, PECVD and ALD<\/td>\n<td>Gas compatibility, purity, heat and vacuum stability<\/td>\n<\/tr>\n<tr>\n<td>PVD<\/td>\n<td>Vacuum sealing, heat resistance and low outgassing<\/td>\n<\/tr>\n<tr>\n<td>Ashing and stripping<\/td>\n<td>Oxygen-plasma resistance and low contamination<\/td>\n<\/tr>\n<tr>\n<td>Thermal processing<\/td>\n<td>Compression-set resistance and high-temperature stability<\/td>\n<\/tr>\n<tr>\n<td>Wet etching and cleaning<\/td>\n<td>Chemical resistance, low extractables and low trace metals<\/td>\n<\/tr>\n<tr>\n<td>Slit and gate valves<\/td>\n<td>Low particles, wear resistance and dynamic seal reliability<\/td>\n<\/tr>\n<tr>\n<td>Gas delivery<\/td>\n<td>Chemical compatibility, permeation control and purity<\/td>\n<\/tr>\n<tr>\n<td>High vacuum<\/td>\n<td>Low outgassing, low permeation and seal-force retention<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>DuPont\u2019s semiconductor material-selection system similarly separates semiconductor applications into plasma\/gas, thermal and wet-process groups rather than using one general FFKM recommendation.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-ffkm-seals-in-plasma-processes-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">04<\/span><h2 id=\"wpsc-ffkm-seals-in-plasma-processes\">FFKM Seals in Plasma Processes<\/h2><\/div>\n<figure class=\"wpsc-visual wpsc-plasma-visual\">\n  <div class=\"wpsc-visual-head\"><span>Plasma interaction<\/span><strong>Chemical radicals and energetic ions attack differently<\/strong><\/div>\n  <div class=\"wpsc-plasma-stage\">\n    <div class=\"wpsc-plasma-cloud\"><i><\/i><i><\/i><i><\/i><i><\/i><i><\/i><span>Reactive plasma<\/span><\/div>\n    <div class=\"wpsc-attack-arrow chemical\">RADICALS<br><small>chemical erosion<\/small><\/div>\n    <div class=\"wpsc-seal-cutaway\"><div class=\"wpsc-seal-surface\"><\/div><strong>FFKM surface<\/strong><small>polymer \u00b7 filler \u00b7 cure system<\/small><\/div>\n    <div class=\"wpsc-attack-arrow physical\">IONS<br><small>physical sputtering<\/small><\/div>\n    <div class=\"wpsc-plasma-notes\"><span>Gas chemistry<\/span><span>RF power<\/span><span>Pressure<\/span><span>Temperature<\/span><span>Seal location<\/span><\/div>\n  <\/div>\n  <figcaption>\u201cPlasma-resistant\u201d is incomplete without the actual reactor, recipe and exposure conditions.<\/figcaption>\n<\/figure><p>Plasma is used in semiconductor manufacturing for processes such as:<\/p>\n<ul>\n<li>Reactive ion etching<\/li>\n<li>Inductively coupled plasma etching<\/li>\n<li>Plasma-enhanced chemical vapor deposition<\/li>\n<li>Plasma-enhanced atomic layer deposition<\/li>\n<li>Resist stripping<\/li>\n<li>Ashing<\/li>\n<li>Chamber cleaning<\/li>\n<li>Surface treatment<\/li>\n<\/ul>\n<p>Common plasma and process gases may include:<\/p>\n<ul>\n<li>Oxygen<\/li>\n<li>Nitrogen trifluoride<\/li>\n<li>Carbon tetrafluoride<\/li>\n<li>Chlorine<\/li>\n<li>Boron trichloride<\/li>\n<li>Sulfur hexafluoride<\/li>\n<li>Fluorocarbon mixtures<\/li>\n<li>Hydrogen-containing gases<\/li>\n<\/ul>\n<p>These environments can attack elastomer surfaces and shorten seal life.<\/p>\n<h3>How plasma attacks an elastomer seal<\/h3>\n<p>Plasma attack may involve chemical or physical mechanisms.<\/p>\n<p>In chemical attack, reactive radicals interact with the seal material and form volatile degradation products. In physical attack, energetic ions bombard and remove material from the seal surface.<\/p>\n<p>The dominant mechanism depends on:<\/p>\n<ul>\n<li>Plasma reactor configuration<\/li>\n<li>Gas chemistry<\/li>\n<li>RF power<\/li>\n<li>Pressure<\/li>\n<li>Temperature<\/li>\n<li>Flow rate<\/li>\n<li>Ion energy<\/li>\n<li>Seal location<\/li>\n<li>Direct or remote exposure<\/li>\n<\/ul>\n<p>DuPont\u2019s plasma-seal research explains that reactive ion etch, inductively coupled plasma and downstream plasma systems can expose seals to very different conditions. It also distinguishes radical-driven chemical erosion from ion-driven physical sputtering.<\/p>\n<p>This is why a statement such as \u201cplasma-resistant FFKM\u201d is not a complete specification.<\/p>\n<h3>Plasma chemistry matters<\/h3>\n<p>Different plasma chemistries can produce different degradation behavior.<\/p>\n<p>For example:<\/p>\n<ul>\n<li>Oxygen plasma may oxidize and remove organic components.<\/li>\n<li>Fluorine plasma may attack particular fillers or polymer structures.<\/li>\n<li>Chlorine-containing plasma may create different compatibility demands.<\/li>\n<li>Remote plasma may produce mainly radical-driven chemical attack.<\/li>\n<li>Direct plasma exposure may include more energetic ion bombardment.<\/li>\n<\/ul>\n<p>A compound that produces low weight loss in one plasma recipe may not provide the same performance in another.<\/p>\n<p>For material evaluation, provide:<\/p>\n<ul>\n<li>Complete gas mixture<\/li>\n<li>Gas-flow ratios<\/li>\n<li>Chamber pressure<\/li>\n<li>Plasma power<\/li>\n<li>Exposure time<\/li>\n<li>Seal location<\/li>\n<li>Chamber temperature<\/li>\n<li>Cleaning chemistry<\/li>\n<li>Maintenance interval<\/li>\n<\/ul>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-plasma-erosion-is-not-the-only-concern-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">05<\/span><h2 id=\"wpsc-plasma-erosion-is-not-the-only-concern\">Plasma Erosion Is Not the Only Concern<\/h2><\/div><p>Low erosion is important, but the seal must also degrade cleanly.<\/p>\n<p>A compound may lose relatively little weight while still leaving particles or metallic residues in the chamber. Another compound may experience controlled erosion but produce mainly volatile products that can be removed through the vacuum system.<\/p>\n<p>This means plasma performance should be evaluated using several measurements:<\/p>\n<ul>\n<li>Weight loss<\/li>\n<li>Surface cracking<\/li>\n<li>Particle count<\/li>\n<li>Particle size<\/li>\n<li>Particle composition<\/li>\n<li>Trace-metal release<\/li>\n<li>Seal-force retention<\/li>\n<li>Leakage after exposure<\/li>\n<\/ul>\n<p>DuPont\u2019s published research shows that filler selection can significantly affect particle and metallic-contamination behavior during plasma exposure.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-how-ffkm-fillers-affect-particle-generation-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">06<\/span><h2 id=\"wpsc-how-ffkm-fillers-affect-particle-generation\">How FFKM Fillers Affect Particle Generation<\/h2><\/div>\n<figure class=\"wpsc-visual wpsc-filler-visual\">\n  <div class=\"wpsc-visual-head\"><span>Contamination pathway<\/span><strong>Low weight loss does not always mean low contamination<\/strong><\/div>\n  <div class=\"wpsc-filler-grid\">\n    <div class=\"wpsc-filler-card mineral\"><span>01<\/span><b>Polymer erodes<\/b><div class=\"wpsc-material-sample\"><i><\/i><i><\/i><i><\/i><i><\/i><\/div><p>Plasma removes the surrounding elastomer.<\/p><\/div>\n    <div class=\"wpsc-flow-arrow\">\u2192<\/div>\n    <div class=\"wpsc-filler-card exposed\"><span>02<\/span><b>Fillers exposed<\/b><div class=\"wpsc-material-sample\"><i><\/i><i><\/i><i><\/i><i><\/i><\/div><p>Hard inorganic particles remain at the surface.<\/p><\/div>\n    <div class=\"wpsc-flow-arrow\">\u2192<\/div>\n    <div class=\"wpsc-filler-card particles\"><span>03<\/span><b>Particles detach<\/b><div class=\"wpsc-particle-field\"><i><\/i><i><\/i><i><\/i><i><\/i><i><\/i><i><\/i><\/div><p>Particles and trace elements can enter the chamber.<\/p><\/div>\n  <\/div>\n  <figcaption>Evaluate particle count, size, composition and metal release\u2014not erosion alone.<\/figcaption>\n<\/figure><p>Conventional FFKM compounds may contain:<\/p>\n<ul>\n<li>Carbon black<\/li>\n<li>Silica<\/li>\n<li>Mineral fillers<\/li>\n<li>Metallic-oxide fillers<\/li>\n<li>Polymeric fillers<\/li>\n<\/ul>\n<p>These fillers can improve hardness, strength, thermal behavior or processability. However, they can also affect contamination performance.<\/p>\n<h3>Mineral and metallic fillers<\/h3>\n<p>Some mineral fillers resist plasma erosion better than the surrounding polymer.<\/p>\n<p>As the polymer is removed, filler particles may remain exposed and eventually detach into the chamber. Depending on their composition, these particles may also introduce metallic or ionic contamination.<\/p>\n<p>DuPont\u2019s plasma research notes that plasma-resistant fillers such as certain oxides can shield the polymer but may increase particle-generation risk after the polymer around them has eroded.<\/p>\n<h3>Polymeric-filled and unfilled compounds<\/h3>\n<p>Polymeric-filled or unfilled FFKM compounds may reduce the risk of leaving hard inorganic particles behind.<\/p>\n<p>Some formulations are designed so that the seal and filler degrade into volatile products more uniformly. This can reduce particulate and metallic contamination in certain plasma environments.<\/p>\n<p>However, an unfilled material is not automatically best for every application. Fillers may be necessary for:<\/p>\n<ul>\n<li>Mechanical reinforcement<\/li>\n<li>Dimensional stability<\/li>\n<li>Wear resistance<\/li>\n<li>Extrusion resistance<\/li>\n<li>Dynamic seal performance<\/li>\n<\/ul>\n<p>The compound must balance plasma cleanliness with the mechanical requirements of the seal location.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-particle-contamination-control-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">07<\/span><h2 id=\"wpsc-particle-contamination-control\">Particle Contamination Control<\/h2><\/div><p>Particles released from a seal can come from:<\/p>\n<ul>\n<li>Plasma erosion<\/li>\n<li>Surface cracking<\/li>\n<li>Abrasion<\/li>\n<li>Dynamic valve movement<\/li>\n<li>Poor installation<\/li>\n<li>Excessive compression<\/li>\n<li>Sticking and tearing<\/li>\n<li>Chemical degradation<\/li>\n<li>Exposed fillers<\/li>\n<\/ul>\n<p>Dynamic seals can be particularly important particle sources because their surfaces repeatedly move against hardware.<\/p>\n<p>Common dynamic locations include:<\/p>\n<ul>\n<li>Slit valves<\/li>\n<li>Gate valves<\/li>\n<li>Isolation valves<\/li>\n<li>Moving chamber doors<\/li>\n<li>Reciprocating mechanisms<\/li>\n<\/ul>\n<p>Greene Tweed reports that a semiconductor FFKM developed using dynamic testing generated substantially fewer particles than a benchmark material during a 60,000-cycle test. The result illustrates why static immersion or plasma tests alone may not predict performance in a moving valve.<\/p>\n<h3>Reducing particle generation<\/h3>\n<p>Particle-control measures may include:<\/p>\n<ul>\n<li>Selecting a low-particle semiconductor compound<\/li>\n<li>Matching the compound to the plasma chemistry<\/li>\n<li>Improving groove design<\/li>\n<li>Preventing seal rolling or twisting<\/li>\n<li>Reducing unnecessary friction<\/li>\n<li>Controlling surface finish<\/li>\n<li>Using an appropriate lubricant where permitted<\/li>\n<li>Selecting a purpose-designed valve seal<\/li>\n<li>Establishing preventive replacement intervals<\/li>\n<\/ul>\n<p>DuPont has developed specialized bonded door and TriLobe seal designs for gate- and slit-valve applications where installation behavior, movement and particle control are important.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-trace-metal-contamination-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">08<\/span><h2 id=\"wpsc-trace-metal-contamination\">Trace-Metal Contamination<\/h2><\/div><p>Trace metals can originate from:<\/p>\n<ul>\n<li>Compound fillers<\/li>\n<li>Pigments<\/li>\n<li>Processing equipment<\/li>\n<li>Mold-release agents<\/li>\n<li>Cleaning processes<\/li>\n<li>Packaging<\/li>\n<li>Seal degradation<\/li>\n<\/ul>\n<p>Relevant elements may include:<\/p>\n<ul>\n<li>Aluminum<\/li>\n<li>Calcium<\/li>\n<li>Iron<\/li>\n<li>Magnesium<\/li>\n<li>Sodium<\/li>\n<li>Titanium<\/li>\n<li>Copper<\/li>\n<li>Zinc<\/li>\n<li>Other process-sensitive metals<\/li>\n<\/ul>\n<p>Plasma can break down the seal surface and release material in atomic, ionic or particulate form. DuPont notes that conventional mineral-filled compounds may contain elements capable of contributing metallic contamination, while certain polymeric-filled or unfilled compounds contain fewer inorganic constituents.<\/p>\n<p>When trace metals are critical, buyers should request actual analytical data for the proposed compound rather than relying on a general statement such as \u201chigh purity.\u201d<\/p>\n<p>Relevant test methods may include:<\/p>\n<ul>\n<li>ICP-MS<\/li>\n<li>Extractable-metal testing<\/li>\n<li>Surface analysis<\/li>\n<li>SEM\/EDX particle analysis<\/li>\n<li>Ion chromatography<\/li>\n<li>Lot-specific contamination testing<\/li>\n<\/ul>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-outgassing-in-high-vacuum-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">09<\/span><h2 id=\"wpsc-outgassing-in-high-vacuum\">Outgassing in High Vacuum<\/h2><\/div>\n<figure class=\"wpsc-visual wpsc-vacuum-visual\">\n  <div class=\"wpsc-visual-head\"><span>Vacuum behavior<\/span><strong>Outgassing and permeation are different gas loads<\/strong><\/div>\n  <div class=\"wpsc-vacuum-stage\">\n    <div class=\"wpsc-vacuum-gauge\"><div class=\"needle\"><\/div><b>10\u207b\u2077<\/b><small>mbar<\/small><\/div>\n    <div class=\"wpsc-vacuum-chamber\">\n      <div class=\"wpsc-vacuum-seal\"><\/div>\n      <div class=\"molecule m1\">\u2022<\/div><div class=\"molecule m2\">\u2022<\/div><div class=\"molecule m3\">\u2022<\/div><div class=\"molecule m4\">\u2022<\/div>\n      <span class=\"out-label\">OUTGASSING<br><small>from the seal<\/small><\/span>\n      <span class=\"perm-label\">PERMEATION \u2192<br><small>through the seal<\/small><\/span>\n    <\/div>\n    <div class=\"wpsc-vacuum-impact\"><b>Process impact<\/b><span>Longer pump-down<\/span><span>Higher background gas<\/span><span>Film contamination<\/span><span>Vacuum instability<\/span><\/div>\n  <\/div>\n  <figcaption>Compare vacuum data only when temperature, pressure, duration, sample and preconditioning are similar.<\/figcaption>\n<\/figure><p>Outgassing is the release of volatile compounds from a material under vacuum, heat or plasma exposure.<\/p>\n<p>Possible sources include:<\/p>\n<ul>\n<li>Residual processing aids<\/li>\n<li>Cure by-products<\/li>\n<li>Absorbed moisture<\/li>\n<li>Low-molecular-weight ingredients<\/li>\n<li>Material-degradation products<\/li>\n<li>Cleaning residues<\/li>\n<\/ul>\n<p>Outgassing can:<\/p>\n<ul>\n<li>Increase pump-down time<\/li>\n<li>Reduce vacuum stability<\/li>\n<li>Contaminate chamber surfaces<\/li>\n<li>Interfere with deposited films<\/li>\n<li>Increase background gases<\/li>\n<li>Shorten maintenance intervals<\/li>\n<\/ul>\n<p>Semiconductor FFKM suppliers therefore develop and test compounds for low outgassing as well as chemical resistance.<\/p>\n<p>Trelleborg states that its semiconductor FFKM range is designed for ultra-low outgassing in high-vacuum conditions, while Greene Tweed identifies low outgassing as a selection feature for specific dry- and wet-process compounds.<\/p>\n<h3>Outgassing data must be compared carefully<\/h3>\n<p>Published outgassing results may use different:<\/p>\n<ul>\n<li>Temperatures<\/li>\n<li>Vacuum levels<\/li>\n<li>Exposure times<\/li>\n<li>Sample sizes<\/li>\n<li>Analytical methods<\/li>\n<li>Preconditioning procedures<\/li>\n<\/ul>\n<p>Two compounds cannot be compared reliably unless the test conditions are similar.<\/p>\n<p>For a critical chamber, request:<\/p>\n<ul>\n<li>Total mass loss<\/li>\n<li>Collected volatile condensable material<\/li>\n<li>Residual gas analysis<\/li>\n<li>Specific detected species<\/li>\n<li>Test temperature<\/li>\n<li>Vacuum level<\/li>\n<li>Bake-out history<\/li>\n<\/ul>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-permeation-and-vacuum-seal-stability-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">10<\/span><h2 id=\"wpsc-permeation-and-vacuum-seal-stability\">Permeation and Vacuum Seal Stability<\/h2><\/div><p>Outgassing and permeation are related but different.<\/p>\n<ul>\n<li><strong>Outgassing<\/strong> comes from substances released by the seal itself.<\/li>\n<li><strong>Permeation<\/strong> is the movement of external gas through the elastomer.<\/li>\n<\/ul>\n<p>Under high vacuum, excessive gas permeation can contribute to:<\/p>\n<ul>\n<li>Increased gas load<\/li>\n<li>Longer pump-down time<\/li>\n<li>Difficulty reaching base pressure<\/li>\n<li>Background contamination<\/li>\n<li>Process instability<\/li>\n<\/ul>\n<p>Seal geometry, cross-section and exposed surface area influence permeation as well as the compound itself.<\/p>\n<p>For high-vacuum applications, evaluate:<\/p>\n<ul>\n<li>Target vacuum level<\/li>\n<li>Acceptable leak rate<\/li>\n<li>Process gas<\/li>\n<li>Seal cross-section<\/li>\n<li>Seal temperature<\/li>\n<li>Pressure differential<\/li>\n<li>Exposure area<\/li>\n<li>Pumping capacity<\/li>\n<li>Required pump-down time<\/li>\n<\/ul>\n<p>DuPont has highlighted low-permeation FFKM seals for high-temperature and high-vacuum semiconductor use, illustrating that vacuum performance may require a dedicated material or design rather than a general-purpose O-ring.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-compression-set-and-thermal-stability-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">11<\/span><h2 id=\"wpsc-compression-set-and-thermal-stability\">Compression Set and Thermal Stability<\/h2><\/div><p>A seal can be chemically resistant and still fail because it loses elastic sealing force.<\/p>\n<p>Compression set becomes especially important in:<\/p>\n<ul>\n<li>Heated process chambers<\/li>\n<li>Diffusion systems<\/li>\n<li>CVD and ALD equipment<\/li>\n<li>Vacuum flanges<\/li>\n<li>Chamber lids<\/li>\n<li>Equipment with long maintenance cycles<\/li>\n<\/ul>\n<p>Possible symptoms include:<\/p>\n<ul>\n<li>Failure to reach vacuum<\/li>\n<li>Leakage after chamber cooldown<\/li>\n<li>Longer pump-down time<\/li>\n<li>Leakage after maintenance<\/li>\n<li>Permanent flattening<\/li>\n<li>Reduced contact pressure<\/li>\n<\/ul>\n<p>A semiconductor FFKM compound should be reviewed for:<\/p>\n<ul>\n<li>Compression set<\/li>\n<li>Seal-force retention<\/li>\n<li>Maximum continuous temperature<\/li>\n<li>Thermal cycling<\/li>\n<li>Vacuum performance<\/li>\n<li>Chemical exposure at temperature<\/li>\n<\/ul>\n<p>The highest published temperature rating is not always the best selection. A compound optimized for extreme heat may have different plasma, outgassing or purity characteristics from a grade designed for deposition or etching.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-wet-process-semiconductor-seals-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">12<\/span><h2 id=\"wpsc-wet-process-semiconductor-seals\">Wet-Process Semiconductor Seals<\/h2><\/div>\n<figure class=\"wpsc-visual wpsc-wet-visual\">\n  <div class=\"wpsc-visual-head\"><span>Wet process<\/span><strong>Compatibility must include chemistry and contamination<\/strong><\/div>\n  <div class=\"wpsc-wet-grid\">\n    <div class=\"wpsc-chem-vessel acid\"><div class=\"liquid\"><\/div><b>ACIDS<\/b><small>HF \u00b7 H\u2082SO\u2084 \u00b7 HNO\u2083<\/small><\/div>\n    <div class=\"wpsc-plus\">+<\/div>\n    <div class=\"wpsc-chem-vessel base\"><div class=\"liquid\"><\/div><b>BASES<\/b><small>NH\u2084OH \u00b7 SC-1<\/small><\/div>\n    <div class=\"wpsc-plus\">+<\/div>\n    <div class=\"wpsc-chem-vessel solvent\"><div class=\"liquid\"><\/div><b>SOLVENTS<\/b><small>NMP \u00b7 IPA \u00b7 DMSO<\/small><\/div>\n    <div class=\"wpsc-wet-checks\"><span>Low extractables<\/span><span>Low ionic contamination<\/span><span>Low trace metals<\/span><span>Controlled packaging<\/span><\/div>\n  <\/div>\n  <figcaption>Dry-plasma qualification alone does not establish suitability for wet benches or chemical delivery.<\/figcaption>\n<\/figure><p>FFKM is also used in wet wafer-processing and chemical-delivery systems.<\/p>\n<p>Typical fluids include:<\/p>\n<ul>\n<li>Ultrapure water<\/li>\n<li>Hydrofluoric acid<\/li>\n<li>Sulfuric acid<\/li>\n<li>Nitric acid<\/li>\n<li>Phosphoric acid<\/li>\n<li>Hydrogen peroxide<\/li>\n<li>Ammonium hydroxide<\/li>\n<li>Piranha solutions<\/li>\n<li>SC-1 and SC-2 cleaning solutions<\/li>\n<li>Photoresist strippers<\/li>\n<li>NMP<\/li>\n<li>Hydroxylamine<\/li>\n<li>IPA<\/li>\n<li>DMSO<\/li>\n<li>Copper-plating solutions<\/li>\n<\/ul>\n<p>DuPont\u2019s wet-process selection guide lists wafer preparation, wet etching, stripping and copper plating as semiconductor applications for specialized high-purity FFKM seals.<\/p>\n<h3>Wet-process selection criteria<\/h3>\n<p>For wet processes, prioritize:<\/p>\n<ul>\n<li>Chemical compatibility<\/li>\n<li>Low extractables<\/li>\n<li>Low ionic contamination<\/li>\n<li>Low trace-metal content<\/li>\n<li>Resistance to swelling<\/li>\n<li>Mechanical-property retention<\/li>\n<li>Cleanroom processing and packaging<\/li>\n<\/ul>\n<p>Greene Tweed reports low total organic carbon, low leachable trace metals and low ionic contamination for semiconductor wet-process seal materials.<\/p>\n<p>A seal compound selected for dry plasma should not automatically be used in a wet bench. The wet-process chemistry and contamination specifications must be reviewed separately.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-cleanroom-manufacturing-and-packaging-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">13<\/span><h2 id=\"wpsc-cleanroom-manufacturing-and-packaging\">Cleanroom Manufacturing and Packaging<\/h2><\/div>\n<figure class=\"wpsc-visual wpsc-cleanroom-visual\">\n  <div class=\"wpsc-visual-head\"><span>Clean handling chain<\/span><strong>Purity can be lost after molding<\/strong><\/div>\n  <div class=\"wpsc-clean-flow\">\n    <div><span>01<\/span><i>\u25cc<\/i><b>Mold<\/b><small>Controlled tooling<\/small><\/div><em>\u2192<\/em>\n    <div><span>02<\/span><i>\u2726<\/i><b>Clean<\/b><small>Validated process<\/small><\/div><em>\u2192<\/em>\n    <div><span>03<\/span><i>\u25ce<\/i><b>Inspect<\/b><small>Particles &amp; defects<\/small><\/div><em>\u2192<\/em>\n    <div><span>04<\/span><i>\u25a3<\/i><b>Double bag<\/b><small>Cleanroom packaging<\/small><\/div><em>\u2192<\/em>\n    <div><span>05<\/span><i>\u2713<\/i><b>Trace<\/b><small>Lot &amp; certificate<\/small><\/div>\n  <\/div>\n  <figcaption>Specify cleaning, bagging, lot identification, contamination limits and packaging material.<\/figcaption>\n<\/figure><p>A high-purity compound can be contaminated after molding if it is handled, cleaned or packaged incorrectly.<\/p>\n<p>Possible contamination sources include:<\/p>\n<ul>\n<li>Dust<\/li>\n<li>Skin contact<\/li>\n<li>Cutting debris<\/li>\n<li>Mold-release residue<\/li>\n<li>Cleaning chemicals<\/li>\n<li>Packaging materials<\/li>\n<li>Uncontrolled storage<\/li>\n<li>Mixed production equipment<\/li>\n<\/ul>\n<p>For critical semiconductor seals, buyers may need to specify:<\/p>\n<ul>\n<li>Cleanroom manufacturing class<\/li>\n<li>Cleaning method<\/li>\n<li>Ultrapure-water rinsing<\/li>\n<li>Particle inspection<\/li>\n<li>Double bagging<\/li>\n<li>Lot identification<\/li>\n<li>Date code<\/li>\n<li>Certificate of conformance<\/li>\n<li>Trace-metal limits<\/li>\n<li>Packaging material<\/li>\n<\/ul>\n<p>Trelleborg states that selected semiconductor FFKM seals are manufactured and packaged in controlled cleanroom conditions, emphasizing that process cleanliness extends beyond the compound formulation itself.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-static-vs-dynamic-semiconductor-seals-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">14<\/span><h2 id=\"wpsc-static-vs-dynamic-semiconductor-seals\">Static vs Dynamic Semiconductor Seals<\/h2><\/div>\n<figure class=\"wpsc-visual wpsc-motion-visual\">\n  <div class=\"wpsc-visual-head\"><span>Seal movement<\/span><strong>Dynamic locations add wear and particle risks<\/strong><\/div>\n  <div class=\"wpsc-motion-grid\">\n    <div><span>STATIC<\/span><svg viewBox=\"0 0 350 170\"><rect x=\"28\" y=\"24\" width=\"294\" height=\"38\" rx=\"7\"\/><rect x=\"28\" y=\"108\" width=\"294\" height=\"38\" rx=\"7\"\/><ellipse cx=\"175\" cy=\"85\" rx=\"66\" ry=\"40\" class=\"seal\"\/><ellipse cx=\"175\" cy=\"85\" rx=\"34\" ry=\"18\" class=\"hole\"\/><path d=\"M102 8V58M248 8V58M102 162V112M248 162V112\"\/><\/svg><b>Retained contact<\/b><p>Vacuum retention, compression set and thermal stability.<\/p><\/div>\n    <div><span>DYNAMIC<\/span><svg viewBox=\"0 0 350 170\"><rect x=\"20\" y=\"20\" width=\"310\" height=\"130\" rx=\"20\"\/><rect x=\"75\" y=\"64\" width=\"210\" height=\"42\" rx=\"21\" class=\"shaft\"\/><ellipse cx=\"105\" cy=\"85\" rx=\"34\" ry=\"58\" class=\"seal\"\/><ellipse cx=\"105\" cy=\"85\" rx=\"17\" ry=\"36\" class=\"hole\"\/><path d=\"M165 49H278M165 121H278\" class=\"move\"\/><\/svg><b>Movement + recovery<\/b><p>Wear, friction, sticking, tearing and generated particles.<\/p><\/div>\n  <\/div>\n  <figcaption>Dynamic seals require representative cycle testing; static material data is not enough.<\/figcaption>\n<\/figure><h3>Static seal locations<\/h3>\n<p>Examples include:<\/p>\n<ul>\n<li>Chamber lids<\/li>\n<li>Gas-manifold connections<\/li>\n<li>Vacuum flanges<\/li>\n<li>Sensor housings<\/li>\n<li>Chemical fittings<\/li>\n<\/ul>\n<p>Key requirements include:<\/p>\n<ul>\n<li>Compression-set resistance<\/li>\n<li>Low outgassing<\/li>\n<li>Chemical compatibility<\/li>\n<li>Vacuum retention<\/li>\n<li>Thermal stability<\/li>\n<\/ul>\n<h3>Dynamic seal locations<\/h3>\n<p>Examples include:<\/p>\n<ul>\n<li>Slit valves<\/li>\n<li>Gate valves<\/li>\n<li>Isolation valves<\/li>\n<li>Moving chamber components<\/li>\n<\/ul>\n<p>Dynamic locations also require:<\/p>\n<ul>\n<li>Wear resistance<\/li>\n<li>Low friction<\/li>\n<li>Tear resistance<\/li>\n<li>Particle control<\/li>\n<li>Resistance to sticking<\/li>\n<li>Stable installation geometry<\/li>\n<\/ul>\n<p>Do not select a dynamic seal using only static plasma-erosion or chemical-immersion data.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-common-semiconductor-ffkm-failure-modes-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">15<\/span><h2 id=\"wpsc-common-semiconductor-ffkm-failure-modes\">Common Semiconductor FFKM Failure Modes<\/h2><\/div><table>\n<thead>\n<tr>\n<th>Failure symptom<\/th>\n<th>Possible cause<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Chamber particles increase<\/td>\n<td>Plasma erosion, filler release or abrasion<\/td>\n<\/tr>\n<tr>\n<td>Seal surface becomes rough<\/td>\n<td>Plasma or chemical attack<\/td>\n<\/tr>\n<tr>\n<td>Vacuum pump-down becomes slower<\/td>\n<td>Outgassing, permeation or compression set<\/td>\n<\/tr>\n<tr>\n<td>Seal sticks to valve hardware<\/td>\n<td>Heat, chemical degradation or excessive compression<\/td>\n<\/tr>\n<tr>\n<td>Seal cracks after chamber cleaning<\/td>\n<td>Incompatible plasma chemistry or thermal cycling<\/td>\n<\/tr>\n<tr>\n<td>Metallic contamination increases<\/td>\n<td>Inorganic filler or handling contamination<\/td>\n<\/tr>\n<tr>\n<td>Seal swells in wet process<\/td>\n<td>Incorrect chemical compatibility<\/td>\n<\/tr>\n<tr>\n<td>Leakage occurs after cooldown<\/td>\n<td>Loss of elastic recovery or compression set<\/td>\n<\/tr>\n<tr>\n<td>Valve creates particles<\/td>\n<td>Dynamic wear, twisting or unsuitable seal geometry<\/td>\n<\/tr>\n<tr>\n<td>Maintenance interval shortens<\/td>\n<td>Wrong compound for process conditions<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Failure analysis should examine the seal together with chamber history, plasma recipe, cleaning cycle and hardware condition.<\/p>\n<p>Useful techniques may include:<\/p>\n<ul>\n<li>Optical inspection<\/li>\n<li>Weight-loss measurement<\/li>\n<li>Hardness testing<\/li>\n<li>Dimensional measurement<\/li>\n<li>SEM\/EDX<\/li>\n<li>Surface spectroscopy<\/li>\n<li>Particle counting<\/li>\n<li>Leak testing<\/li>\n<li>Compression-set evaluation<\/li>\n<\/ul>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-how-to-select-a-semiconductor-ffkm-compound-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">16<\/span><h2 id=\"wpsc-how-to-select-a-semiconductor-ffkm-compound\">How to Select a Semiconductor FFKM Compound<\/h2><\/div>\n<figure class=\"wpsc-visual wpsc-selection-visual\">\n  <div class=\"wpsc-visual-head\"><span>Qualification workflow<\/span><strong>Eight inputs lead to one named, validated compound<\/strong><\/div>\n  <div class=\"wpsc-selection-grid\">\n    <div><span>01<\/span><b>Process<\/b><small>Etch \u00b7 Deposition \u00b7 Wet<\/small><\/div><div><span>02<\/span><b>Chemistry<\/b><small>Gases \u00b7 Liquids \u00b7 By-products<\/small><\/div>\n    <div><span>03<\/span><b>Plasma<\/b><small>Type \u00b7 Power \u00b7 Pressure<\/small><\/div><div><span>04<\/span><b>Thermal\/Vacuum<\/b><small>Temperature \u00b7 Base pressure<\/small><\/div>\n    <div><span>05<\/span><b>Purity<\/b><small>Particles \u00b7 Metals \u00b7 Outgassing<\/small><\/div><div><span>06<\/span><b>Movement<\/b><small>Static \u00b7 Dynamic \u00b7 Cycles<\/small><\/div>\n    <div><span>07<\/span><b>Hardware<\/b><small>Groove \u00b7 Squeeze \u00b7 Finish<\/small><\/div><div><span>08<\/span><b>Validate<\/b><small>Lab \u00b7 Dynamic \u00b7 Chamber<\/small><\/div>\n  <\/div>\n  <div class=\"wpsc-selection-result\"><i><\/i><strong>Named compound + approved manufacturing process<\/strong><\/div>\n  <figcaption>The final specification should not stop at \u201csemiconductor-grade FFKM.\u201d<\/figcaption>\n<\/figure><p>Use the following selection process.<\/p>\n<h3>1. Identify the process segment<\/h3>\n<p>Specify whether the seal is used in:<\/p>\n<ul>\n<li>Etch<\/li>\n<li>Deposition<\/li>\n<li>Ashing or stripping<\/li>\n<li>Thermal processing<\/li>\n<li>Ion implantation<\/li>\n<li>Wet cleaning<\/li>\n<li>Chemical distribution<\/li>\n<li>Vacuum transfer<\/li>\n<\/ul>\n<h3>2. Define the complete chemistry<\/h3>\n<p>Provide:<\/p>\n<ul>\n<li>Process gases<\/li>\n<li>Plasma gases<\/li>\n<li>Cleaning gases<\/li>\n<li>Wet chemicals<\/li>\n<li>Concentrations<\/li>\n<li>Gas-flow ratios<\/li>\n<li>Reaction by-products<\/li>\n<\/ul>\n<h3>3. Define plasma conditions<\/h3>\n<p>Include:<\/p>\n<ul>\n<li>Direct or remote plasma<\/li>\n<li>Reactor type<\/li>\n<li>RF power<\/li>\n<li>Pressure<\/li>\n<li>Temperature<\/li>\n<li>Exposure duration<\/li>\n<li>Seal location<\/li>\n<\/ul>\n<h3>4. Define temperature and vacuum<\/h3>\n<p>Provide:<\/p>\n<ul>\n<li>Normal temperature<\/li>\n<li>Peak temperature<\/li>\n<li>Bake-out temperature<\/li>\n<li>Base pressure<\/li>\n<li>Operating pressure<\/li>\n<li>Acceptable leak rate<\/li>\n<li>Pump-down requirement<\/li>\n<\/ul>\n<h3>5. Define contamination limits<\/h3>\n<p>Specify requirements for:<\/p>\n<ul>\n<li>Particle generation<\/li>\n<li>Trace metals<\/li>\n<li>Outgassing<\/li>\n<li>Extractables<\/li>\n<li>Ionic contamination<\/li>\n<li>Total organic carbon<\/li>\n<\/ul>\n<h3>6. Define seal movement<\/h3>\n<p>Identify:<\/p>\n<ul>\n<li>Static or dynamic use<\/li>\n<li>Valve cycle rate<\/li>\n<li>Speed<\/li>\n<li>Stroke<\/li>\n<li>Surface finish<\/li>\n<li>Lubrication restrictions<\/li>\n<\/ul>\n<h3>7. Review the seal design<\/h3>\n<p>Provide:<\/p>\n<ul>\n<li>O-ring dimensions<\/li>\n<li>Groove width and depth<\/li>\n<li>Seal squeeze<\/li>\n<li>Stretch<\/li>\n<li>Extrusion clearance<\/li>\n<li>Hardware tolerances<\/li>\n<li>Drawing or physical sample<\/li>\n<\/ul>\n<h3>8. Validate the actual compound<\/h3>\n<p>For critical applications, consider:<\/p>\n<ul>\n<li>Plasma erosion testing<\/li>\n<li>Particle testing<\/li>\n<li>Outgassing analysis<\/li>\n<li>Trace-metal analysis<\/li>\n<li>Chemical immersion<\/li>\n<li>Thermal cycling<\/li>\n<li>Dynamic cycle testing<\/li>\n<li>Chamber-level qualification<\/li>\n<\/ul>\n<p>The final specification should identify a named compound and approved manufacturing process rather than simply stating \u201csemiconductor-grade FFKM.\u201d<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-semiconductor-ffkm-rfq-checklist-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">17<\/span><h2 id=\"wpsc-semiconductor-ffkm-rfq-checklist\">Semiconductor FFKM RFQ Checklist<\/h2><\/div><table>\n<thead>\n<tr>\n<th>Information<\/th>\n<th>Details required<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Process type<\/td>\n<td>Etch, CVD, ALD, PVD, ash, thermal or wet<\/td>\n<\/tr>\n<tr>\n<td>Process gases<\/td>\n<td>Complete gas and plasma chemistry<\/td>\n<\/tr>\n<tr>\n<td>Cleaning chemistry<\/td>\n<td>NF3, O2, CF4 or other cleaning media<\/td>\n<\/tr>\n<tr>\n<td>Wet chemicals<\/td>\n<td>Names, concentrations and mixtures<\/td>\n<\/tr>\n<tr>\n<td>Temperature<\/td>\n<td>Minimum, normal, maximum and bake-out<\/td>\n<\/tr>\n<tr>\n<td>Vacuum<\/td>\n<td>Base pressure and acceptable leak rate<\/td>\n<\/tr>\n<tr>\n<td>Plasma<\/td>\n<td>Type, power, pressure and exposure time<\/td>\n<\/tr>\n<tr>\n<td>Movement<\/td>\n<td>Static or dynamic<\/td>\n<\/tr>\n<tr>\n<td>Cycles<\/td>\n<td>Valve cycles or maintenance interval<\/td>\n<\/tr>\n<tr>\n<td>Purity<\/td>\n<td>Particle, metal, outgassing and extractable limits<\/td>\n<\/tr>\n<tr>\n<td>Dimensions<\/td>\n<td>Seal size and groove drawing<\/td>\n<\/tr>\n<tr>\n<td>Existing seal<\/td>\n<td>Current material and compound if known<\/td>\n<\/tr>\n<tr>\n<td>Failure mode<\/td>\n<td>Erosion, particles, sticking, leakage or swelling<\/td>\n<\/tr>\n<tr>\n<td>Packaging<\/td>\n<td>Cleanroom and bagging requirements<\/td>\n<\/tr>\n<tr>\n<td>Quantity<\/td>\n<td>Prototype and annual demand<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-total-cost-of-ownership-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">18<\/span><h2 id=\"wpsc-total-cost-of-ownership\">Total Cost of Ownership<\/h2><\/div>\n<figure class=\"wpsc-visual wpsc-tco-visual\">\n  <div class=\"wpsc-visual-head\"><span>Lifecycle economics<\/span><strong>Seal price is only one part of process cost<\/strong><\/div>\n  <div class=\"wpsc-tco-grid\">\n    <div class=\"wpsc-tco-price\"><span>SEAL PRICE<\/span><b>$<\/b><p>Visible purchase cost<\/p><\/div>\n    <div class=\"wpsc-tco-vs\">VS<\/div>\n    <div class=\"wpsc-tco-ops\"><span>OPERATING RISK<\/span><div><i style=\"--v:88%\">Downtime<\/i><i style=\"--v:73%\">Lost wafers<\/i><i style=\"--v:62%\">Cleaning<\/i><i style=\"--v:55%\">Requalification<\/i><\/div><\/div>\n  <\/div>\n  <figcaption>The least costly qualified material is the one that meets process, purity and reliability requirements over its service interval.<\/figcaption>\n<\/figure><p>Semiconductor FFKM seals can have a high initial purchase price, but seal cost should be evaluated against:<\/p>\n<ul>\n<li>Chamber downtime<\/li>\n<li>Preventive-maintenance labor<\/li>\n<li>Lost wafers<\/li>\n<li>Chamber cleaning<\/li>\n<li>Requalification<\/li>\n<li>Yield loss<\/li>\n<li>Spare-parts inventory<\/li>\n<li>Valve or hardware damage<\/li>\n<\/ul>\n<p>DuPont\u2019s lifecycle-cost guidance recommends comparing seal price with mean time between repair, unscheduled downtime and the operational costs associated with replacement.<\/p>\n<p>A more expensive compound may provide lower total cost when it:<\/p>\n<ul>\n<li>Reduces particle generation<\/li>\n<li>Extends chamber-cleaning intervals<\/li>\n<li>Improves valve cycle life<\/li>\n<li>Reduces vacuum failures<\/li>\n<li>Prevents contamination<\/li>\n<li>Supports longer maintenance intervals<\/li>\n<\/ul>\n<p>The best compound is not necessarily the one with the highest temperature rating or purchase price. It is the least costly qualified material that meets the process, purity and reliability requirements.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-common-selection-mistakes-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">19<\/span><h2 id=\"wpsc-common-selection-mistakes\">Common Selection Mistakes<\/h2><\/div><h3>Selecting one FFKM for every semiconductor process<\/h3>\n<p>Etching, deposition, wet processing and thermal equipment create different sealing conditions.<\/p>\n<h3>Evaluating only plasma weight loss<\/h3>\n<p>A compound may have low erosion but still generate particles or trace-metal contamination.<\/p>\n<h3>Ignoring filler chemistry<\/h3>\n<p>Filler type can influence particle and metallic-residue behavior.<\/p>\n<h3>Using a dry-process compound in a wet application<\/h3>\n<p>Plasma resistance does not confirm compatibility with acids, bases, solvents or strippers.<\/p>\n<h3>Ignoring dynamic particle generation<\/h3>\n<p>A slit-valve seal should be evaluated under representative movement and cycle conditions.<\/p>\n<h3>Comparing outgassing values from different test methods<\/h3>\n<p>Temperature, pressure, duration and sample preparation must be comparable.<\/p>\n<h3>Specifying only \u201chigh-purity FFKM\u201d<\/h3>\n<p>The exact compound, cleaning process, packaging and contamination limits should be defined.<\/p>\n<h3>Ignoring the groove and hardware<\/h3>\n<p>Even the correct compound can fail because of excessive squeeze, poor surface finish, twisting or insufficient groove volume.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-conclusion-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">20<\/span><h2 id=\"wpsc-conclusion\">Conclusion<\/h2><\/div><p>FFKM seals help semiconductor equipment operate in environments involving plasma, reactive gases, high vacuum, extreme temperatures and aggressive wet chemicals.<\/p>\n<p>However, successful semiconductor sealing requires more than broad chemical resistance.<\/p>\n<p>The selected compound must provide the right balance of:<\/p>\n<ul>\n<li>Plasma resistance<\/li>\n<li>Low erosion<\/li>\n<li>Low particle generation<\/li>\n<li>Low trace-metal content<\/li>\n<li>Low outgassing<\/li>\n<li>Low extractables<\/li>\n<li>Vacuum stability<\/li>\n<li>Compression-set resistance<\/li>\n<li>Wet-chemical compatibility<\/li>\n<li>Mechanical performance<\/li>\n<li>Cleanroom processing<\/li>\n<\/ul>\n<p>Different etch, deposition, thermal and wet processes may require different FFKM formulations.<\/p>\n<p>For critical applications, compound selection should be based on the complete plasma recipe, process chemistry, temperature, vacuum level, seal movement and contamination requirements. Qualification testing should reproduce the actual process as closely as practical.<\/p>\n<\/section>\n<section class=\"wpsc-section\" id=\"wpsc-frequently-asked-questions-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">21<\/span><h2 id=\"wpsc-frequently-asked-questions\">Frequently Asked Questions<\/h2><\/div><div class=\"wpsc-faq-list\"><details class=\"wpsc-faq-item\"><summary>Why is FFKM used in semiconductor equipment?<span>+<\/span><\/summary><div class=\"wpsc-faq-answer\"><p>FFKM provides a combination of chemical resistance, temperature stability and elastic sealing performance. Semiconductor-specific grades can also offer low particles, low outgassing and low trace-metal contamination.<\/p>\n<\/div><\/details><details class=\"wpsc-faq-item\"><summary>Is every FFKM suitable for plasma?<span>+<\/span><\/summary><div class=\"wpsc-faq-answer\"><p>No. Plasma performance depends on the polymer, filler, cure system, plasma chemistry, power, pressure and seal location.<\/p>\n<\/div><\/details><details class=\"wpsc-faq-item\"><summary>Which FFKM is best for oxygen plasma?<span>+<\/span><\/summary><div class=\"wpsc-faq-answer\"><p>A compound specifically tested for oxygen-plasma resistance should be selected. General chemical compatibility does not confirm oxygen-plasma performance.<\/p>\n<\/div><\/details><details class=\"wpsc-faq-item\"><summary>Which FFKM is best for NF3 chamber cleaning?<span>+<\/span><\/summary><div class=\"wpsc-faq-answer\"><p>Use a compound evaluated under representative fluorine-containing plasma conditions. Gas concentration, plasma source, temperature and exposure time must be considered.<\/p>\n<\/div><\/details><details class=\"wpsc-faq-item\"><summary>Can fillers cause semiconductor contamination?<span>+<\/span><\/summary><div class=\"wpsc-faq-answer\"><p>Yes. Certain inorganic or metallic fillers may remain as particles or release trace elements after the surrounding polymer is eroded.<\/p>\n<\/div><\/details><details class=\"wpsc-faq-item\"><summary>What is the difference between outgassing and permeation?<span>+<\/span><\/summary><div class=\"wpsc-faq-answer\"><p>Outgassing is the release of volatile material from the seal itself. Permeation is gas passing through the elastomer from one side to the other.<\/p>\n<\/div><\/details><details class=\"wpsc-faq-item\"><summary>Are black FFKM seals unsuitable for semiconductor applications?<span>+<\/span><\/summary><div class=\"wpsc-faq-answer\"><p>Not automatically. Color alone does not define purity or plasma performance. The actual filler system, compound test data and application requirements should be reviewed.<\/p>\n<\/div><\/details><details class=\"wpsc-faq-item\"><summary>Can the same FFKM seal be used for dry and wet processes?<span>+<\/span><\/summary><div class=\"wpsc-faq-answer\"><p>Possibly, but this should not be assumed. The compound must meet both plasma or vacuum requirements and the complete wet-chemical compatibility profile.<\/p>\n<\/div><\/details><details class=\"wpsc-faq-item\"><summary>How can seal-generated particles be reduced?<span>+<\/span><\/summary><div class=\"wpsc-faq-answer\"><p>Use an application-specific low-particle compound, optimize the seal and groove design, prevent twisting, control friction and validate the seal under representative plasma or movement cycles.<\/p>\n<\/div><\/details><details class=\"wpsc-faq-item\"><summary>Should semiconductor seals be cleanroom packaged?<span>+<\/span><\/summary><div class=\"wpsc-faq-answer\"><p>Cleanroom cleaning and packaging may be required when particle, metal-ion or organic contamination limits are strict. The required cleanliness level should be stated on the purchase specification.<\/p>\n<\/div><\/details><\/div><\/section>\n<section class=\"wpsc-section wpsc-contact-section\" id=\"wpsc-need-a-custom-semiconductor-ffkm-seal-section\" data-wpsc-section><div class=\"wpsc-section-heading\"><span class=\"wpsc-section-index\">22<\/span><h2 id=\"wpsc-need-a-custom-semiconductor-ffkm-seal\">Need a Custom Semiconductor FFKM Seal?<\/h2><\/div><div class=\"wpsc-contact-grid\"><div class=\"wpsc-contact-copy\"><p>Walle Seals manufactures custom FFKM O-rings, chamber seals, valve seals, gaskets and molded sealing components for semiconductor plasma, vacuum, thermal and wet-processing equipment.<\/p>\n<p>Send us:<\/p>\n<ul>\n<li>Process and cleaning gases<\/li>\n<li>Plasma type and operating parameters<\/li>\n<li>Wet chemicals and concentrations<\/li>\n<li>Operating and peak temperatures<\/li>\n<li>Vacuum and pressure conditions<\/li>\n<li>Static or dynamic seal requirements<\/li>\n<li>Groove drawing or physical sample<\/li>\n<li>Particle, trace-metal and outgassing requirements<\/li>\n<li>Current seal material and failure symptoms<\/li>\n<li>Required packaging and traceability<\/li>\n<\/ul>\n<p>Our engineering team will review your process conditions and recommend an appropriate FFKM compound and seal configuration.<\/p>\n<\/div><aside class=\"wpsc-contact-card\"><span>ENGINEERING REVIEW<\/span><strong>Send the complete process window\u2014not just the material name.<\/strong><p>Include chemistry, plasma, temperature, vacuum, movement, dimensions and contamination limits.<\/p><a class=\"wpsc-button wpsc-button-primary\" href=\"\/contact-us\/\">Discuss your application <b>\u2192<\/b><\/a><small>Replace <code>\/contact-us\/<\/code> with your actual contact page.<\/small><\/aside><\/div><\/section>\n      <\/article>\n    <\/main>\n  <\/div>\n  <button class=\"wpsc-back-top\" type=\"button\" data-wpsc-back-top aria-label=\"Back to top\">\u2191<\/button>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Industry ApplicationsSemiconductor sealing guide FFKM Seals for Semiconductor Manufacturing: Plasma, Vacuum and Contamination Control Plasma resistance is only the beginning. Build a sealing specification around chemistry, vacuum, thermal cycling, particles, outgassing and trace-metal limits. Explore the guide \u2193View RFQ checklist 3process families 8selection inputs 1named validated compound PROCESS WINDOW Plasma + Vacuum Purity under pressure [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5784,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[85,110],"tags":[],"class_list":["post-5782","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-industry-applications"],"_links":{"self":[{"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/posts\/5782","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=5782"}],"version-history":[{"count":2,"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/posts\/5782\/revisions"}],"predecessor-version":[{"id":5785,"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/posts\/5782\/revisions\/5785"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/media\/5784"}],"wp:attachment":[{"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/media?parent=5782"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/categories?post=5782"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/walleglobal.com\/de\/wp-json\/wp\/v2\/tags?post=5782"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}