Perfluoroelastomers (FFKM) offer the highest RGD resistance due to fully fluorinated backbones and minimal unsaturated sites. Brands like Kalrez® 0090 and Tecnoflon® PFR consistently survive 20+ decompression cycles at 20,000 psi and 200°C with zero cracking, making them the preferred choice for critical subsea and downhole HPHT sealing. https://globalsealstech.com/product/rgd-rapid-gas-decompression-o-rings/