Low-temperature flexibility prevents brittleness in cryogenic seals. PCTFE and special PTFE grades retain elongation below -150°C, avoiding catastrophic failure. This property supports reliable operation in LNG storage tanks and carrier loading systems exposed to ambient-to-cryogenic transitions. https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/