The B02 profile represents a high-performance, single-acting non-metallic backup ring featuring a specialized concave (curved) inner face. It is specifically designed to protect elastomeric sealing elements, such as O-rings, from structural damage and gap extrusion in both static and dynamic high-pressure fluid applications. While it provides no independent fluid sealing function, the B02 profile acts as a rigid support barrier that bridges the hardware clearance gap behind the primary seal. The unique concave contour is precision-engineered to perfectly match the outer curvature of an O-ring, ensuring uniform load distribution and preserving the seal’s cross-sectional geometry under extreme operating pressures.

The solid backup body (shown in teal) is precision-machined from advanced high-modulus engineering plastics, most commonly Virgin Polytetrafluoroethylene (PTFE), carbon-filled or bronze-filled PTFE compounds, Polyoxymethylene (POM), or high-strength Thermoplastic Polyurethane (TPU). These high-spec compounds deliver exceptional shear resistance, high compressive strength, and minimal cold flow tendencies under intense 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 signature concave inner face offers a distinct mechanical advantage over flat backup rings: it cradles the elastomeric O-ring under pressure, preventing the O-ring from flattening, distorting, or twisting inside the installation groove. By maintaining the natural round shape of the primary seal, the B02 profile maximizes the seal’s elastic recovery and ensures consistent radial contact pressure. This robust structural cross-section fills the mechanical clearance gap directly behind the seal’s low-pressure side, elevating the pressure handling capacity of standard elastomeric seals up to 50 MPa or higher and entirely eliminating micro-shaving and nibbling failures during intense cyclical pressure loading.

The B02 concave backup ring is widely utilized across heavy-duty industrial, mobile hydraulic, and high-pressure fluid handling infrastructure where high system pressure, aggressive cycling, 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.