PTFE composites in Downhole Seal Stacks provide low-friction V-rings filled with glass or carbon for extrusion resistance up to 260°C. Inert to solvents, they excel in dynamic sleeves. 15% graphite filler cuts wear in mud motors. Limitations: poor elasticity, needing energizers. Fluoroloy AO2 variants offer cryogenic flexibility. In subsea tools, they reduce torque by 60%, per Saint-G... https://globalsealstech.com/media/