The B04 profile represents a high-performance, single-acting non-metallic backup ring featuring an asymmetrical cross-section with a pronounced chamfer on its lower outer corner. Engineered explicitly to safeguard elastomeric sealing elements from gap extrusion and structural degradation, it acts as a rigid sacrificial structural barrier that fills the mechanical clearance gap on the low-pressure side of the seal assembly. While it provides no independent fluid sealing function, its unique chamfered geometry allows it to settle seamlessly into specialized stepped or radiused groove hardware configurations, maximizing backing efficiency without binding.

The solid backup body (shown in teal) is precision-machined from premium high-modulus engineering plastics, most commonly Virgin Polytetrafluoroethylene (PTFE), carbon-filled or bronze-filled PTFE compounds, Polyoxymethylene (POM), or high-strength Thermoplastic Polyurethane (TPU). The chosen compound provides exceptional shear resistance, high compressive strength, and minimal cold flow tendencies under intense mechanical load. It operates reliably within a wide temperature spectrum from -50°C to +135°C (up to +200°C when utilizing high-spec fluoropolymer variants) and demonstrates complete chemical compatibility with standard mineral hydraulic oils, synthetic lubricants, water-glycol fluids, and aggressive process chemicals.

The distinctive lower corner chamfer provides an optimized fit that accommodates hardware corner radiuses or specialized step transitions within the installation gland, preventing the backup ring from riding up or tilting during assembly. By presenting a clean, flat backing wall to the primary elastomeric seal, the B04 profile ensures uniform distribution of pre-load forces across the main seal body, completely eliminating localized stress concentrations and micro-shaving failures. Its robust structural cross-section comfortably elevates the pressure handling capacity of standard elastomeric seals up to 50 MPa or higher, significantly extending seal life in systems characterized by large clearance gaps or intense cyclical pressure loading.

The B04 chamfered backup ring is widely utilized across heavy-duty industrial, mobile hydraulic, and high-pressure fluid handling infrastructure where space constraints, specific hardware radiuses, or extreme clearance gaps pose an extrusion risk to standard seals. It is standardly equipped in high-pressure SAE hydraulic flanges, cartridge valve housings, multi-stage control manifolds, and heavy-duty hydraulic cylinder piston or rod glands. Additionally, its superior anti-extrusion efficiency and low-friction wear properties make it the ideal selection for chemical processing metering pumps, high-pressure industrial pipe fittings, injection molding machines, and subsea oil and gas control valves.