Backup ring materials in RGD resistant HPHT seals include virgin PTFE, PEEK, and polyimide for optimal extrusion resistance. These non-elastomeric components support the primary seal at high pressures while allowing gas escape during decompression. Their temperature stability up to 315°C complements advanced elastomers in the most extreme HPHT applications. https://globalsealstech.com/product/rgd-rapid-gas-decompression-o-rings/