Body gaskets in API 6D use spiral-wound Inconel 625 with graphite filler, sealing 10,000 psi. Cameron’s SW gaskets compress to 0.175-inch, with inner rings preventing buckling. In LNG pipelines, these gaskets maintain seal after 500 thermal shocks from -196°C to 100°C https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/