Cryogenic temperature requirements demand materials maintaining flexibility and sealing effectiveness at extremely low temperatures. Standard elastomers become brittle and fail below minus 40°F. LNG-compatible materials include PTFE, filled PTFE, and specialized elastomers like perfluoroelastomers retaining properties to minus 320°F. Material selection must prevent thermal shock crack... https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/