Composite, high temperature, dynamic seal and method of making same

An interference-type rotary seal adapted for use in a high temperature environment between a first member and a second member allowed to move relative to the first member, the rotary seal comprising a seal body of generally ring-shaped configuration, said seal body comprising:

• a first layer composed of a tetrafluoroethylene and propylene copolymer-based elastomer compound, said first layer defining at least a portion of a dynamic sealing surface;
• and
• a second layer composed of a fluorocarbon rubber-based elastomer compound, said second layer defining at least a portion of a static sealing surface,
• wherein said tetrafluoroethylene and propylene copolymer-based elastomer compound of said first layer and said fluorocarbon rubber-based elastomer compound of said second layer are chemically cross-linked to each other and the bond between said tetrafluoroethylene and propylene copolymer-based elastomer compound of said first layer and said fluorocarbon rubber-based compound of said second layer exceeding the strength of said fluorocarbon rubber-based compound.

A dynamic seal comprising a seal body of generally ring-shaped configuration, said seal body comprising:

• a first layer composed of tetrafluoroethylene and propylene copolymer compound having a first modulus of elasticity, said first layer defining at least a portion of a dynamic sealing surface and having a first layer thickness;
• and
• a second layer composed of fluorocarbon rubber compound having a second modulus of elasticity approximately equal to said first modulus of elasticity, said second layer defining at least a portion of a static sealing surface and having a second layer thickness, said second layer thickness being greater than said first layer thickness,
• wherein said first and second layers are chemically cross-linked to each other and the bond between said first and second layers exceeding the strength of said second layer.