Filled PTFE variants, such as glass-filled or bronze-filled, enhance abrasion resistance in LNG ball valves. These composites improve dimensional stability under load while retaining cryogenic flexibility. Used in seat rings, they minimize particle generation and support bubble-tight sealing per API 598 Class VI after thermal cycling https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/