FKM (Viton) seals power high-temp downhole tools to 200°C, resisting amines and steam in SAGD. Low set for repeated actuation in safety valves. In chevron stacks, pairs with PEEK for 15,000 PSI. Terpolymers add low-temp flexibility to -30°C. Gulf of Mexico valves show 7-year life. Limitations: RGD in gas, addressed by dense cures. DuPont’s Viton GLT passes ISO 23936-2. Essential for c... https://globalsealstech.com/product-category/oil-gas-seals/downhole-completion-tools-seals/