Metal-to-metal / metal-plastic seals
These are seals composed of a metal washer with an elastomeric ring firmly bonded to the inside of the bore. The metal washer limits deformation and prevents over-compression of the elastomeric ring. Sealing rings were originally designed to replace copper washers in high-pressure systems, and are now an integral component in a variety of mechanical, hydraulic and pneumatic applications.
They are used to protect critical bolted connections and mounting elements in sensitive applications such as pipe connections and couplings. While elastomer-only gaskets can sometimes be used to provide sealing pressure, bonded gaskets combine a metal washer with an elastomer ring to create a stronger and more powerful leak-proof seal.
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