PTFE seals offer unmatched chemical inertness and low friction (0.02-0.1 μ). Filled compounds like 15% glass or carbon boost wear resistance for unlubricated oilfield valves. Pure PTFE suits rotary unions. High thermal range (-200 to 260°C) fits subsea hydraulics. Drawbacks: poor elasticity requires energizers. API 6D-compliant for ball valves. Machined or molded profiles ensure fit. ... https://globalsealstech.com/hydraulic-seals/