ISO 23936-2 (formerly API 6A Appendix F) specifies even harsher RGD protocols with mixed gases (10% H2S/90% CO2) at 210 bar and 150°C. Decompression rate reaches 35 bar/minute. Only advanced tetrafluoroelastomers and specially cured FFKM pass without extrusion or splitting, proving suitability for the most severe sour HPHT service. https://globalsealstech.com/product/rgd-rapid-gas-decompression-o-rings/