Rapid Gas Decompression testing per API 6A Annex F requires 10 cycles at 80% rated pressure and maximum temperature. Seals must show no external leakage or cracking (0000 rating). Only FFKM, FEPM, and special HNBR grades consistently pass PR2F with RGD https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/