Temperature service classifications include cold (minus 75°F to plus 180°F), standard (minus 20°F to plus 250°F), and high temperature (minus 20:F to plus 350:F) designations. Seals must maintain elasticity and sealing effectiveness across these temperature ranges. Extreme conditions require specialized compounds that resist hardening, cracking, or degradation when exposed to thermal ... https://globalsealstech.com/product-category/oil-gas-seals/api-6a-gate-valve-seals/