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Bonded seal
A bonded seal is a hybrid sealing component that combines a metal washer with an elastomeric sealing ring bonded to its inner diameter. This design creates a reliable, leak-proof seal around bolts, screws, and flanged connections in static applications such as hydraulic and pneumatic systems. Originally developed by the Dowty Group, these seals are also commonly known as Dowty seals or bonded washers.
Back-up Ring
Categories : Industrial Parts & Safety Gear
A Back-up Ring is an essential sealing component designed to be used in conjunction with O-rings to prevent seal extrusion and premature failure in high-pressure, high-temperature, or large-clearance applications. By providing firm structural support to the O-ring, the back-up ring effectively blocks extrusion gaps, ensuring sealing stability, extended service life, and reliable performance under demanding operating conditions. Back-up rings are widely used in hydraulic and pneumatic systems, where pressure spikes and dynamic motion can compromise standard elastomer seals. Available in materials such as PTFE (Teflon) and Nylon, they offer excellent resistance to pressure, wear, and chemical attack, making them ideal for industrial, oil & gas, and heavy-duty engineering applications.