Rapid gas decompression (RGD) resistant seals are mandatory for high-pressure gas wellheads. Specially processed AFLAS, HNBR, and FFKM grades tested to NORSOK M-710 RGD protocols prevent blistering and cracking when pressure drops from 15,000 psi to atmospheric in minutes during emergency shutdown scenarios. https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/