Failure modes for API 6A seals include extrusion, blowout, chemical degradation, thermal damage, and mechanical damage. Extrusion occurs when seals squeeze into clearance gaps under excessive pressure. Blowout results from inadequate seal retention or material failure. Chemical incompatibility degrades seal properties. Thermal exposure beyond material limits causes hardening or cracking. https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/