Fire-resistant seal assemblies

A fire-resistant seal assembly, comprising:

• a first seal comprising an elastomeric material;
• a first anti-extrusion seal having a first seal-facing surface for receiving the first seal, wherein the first seal-facing surface defines a groove extending along the first seal-facing surface, and an exterior surface, that when viewed in a longitudinal cross section, has a truncated V-shaped portion and beveled end portions configured for sealing contact with a gland;
• at least one second anti-extrusion seal having a second seal-facing surface for receiving the first anti-extrusion seal, wherein the second seal-facing surface defines a groove extending along the second seal-facing surface, and an exterior surface that, when viewed in a longitudinal cross section, has a truncated V-shaped portion and beveled end portions configured for sealing contact with the gland, wherein the exterior surface of the first anti-extrusion seal is positioned at least partially within the groove of the at least one second anti-extrusion seal such that a portion of the exterior surface of the first anti-extrusion seal contacts the second seal-facing surface of the at least one second anti-extrusion seal;
• and
• at least one backer ring having a third seal-facing surface for receiving the at least one second anti-extrusion seal, wherein the third seal-facing surface defines a groove extending along the third seal-facing surface, and an exterior surface that, when viewed in a longitudinal cross section, has a truncated V-shape, wherein the exterior surface of the at least one second anti-extrusion seal is positioned at least partially within the groove of the at least one backer ring such that a portion of the exterior surface of the at least one second anti-extrusion seal contacts the third seal-facing surface of the at least one backer ring,
• wherein the first anti-extrusion seal comprises a first polymeric material, and the second anti-extrusion seal comprises a second polymeric material;
• wherein a decomposition temperature of the first polymeric material of the first anti-extrusion seal is higher than a decomposition temperature of the elastomeric material of first seal;
• wherein a decomposition temperature of the second polymeric material of the at least one second anti-extrusion seal is higher than a decomposition temperature of the first polymeric material of the first anti-extrusion seal;
• and
• wherein a decomposition temperature is a temperature at which a seal decomposes, deteriorates, or irreversibly fails such that the seal is no longer able to form a seal with a gland.