Explosive Decompression (ED) testing follows standards like NORSOK M-710, ISO 23936-2, and API 6A Annex F. Seals are saturated at high pressure/temperature with CO₂ or mixed gas, then decompressed at 20–50 bar/min. Post-test, cross-sections are examined for cracks. Rating 0000 (no cracks) is required for critical HPHT service; 4444 indicates total failure. https://globalsealstech.com/oil-gas-seals/