Temperature service classifications include standard (-20°F to +250°F), low temperature (-75°F to +180°F), and high temperature (-20°F to +350°F or higher) designations. Seals must maintain elasticity and sealing effectiveness across these ranges while resisting thermal degradation. Temperature extremes occur during production startups, shutdowns, and thermal recovery operations. Mate... https://globalsealstech.com/product-category/oil-gas-seals/api-6a-wellhead-equipment-seals/