BLACK-MAX gasket-made from foil-reinforced, exfoliated graphite. These gaskets are made from multiple layers of exfoliated graphite foil and 316 stainless steel foil insuring gasket stability. You can use them in virtually any situation, in environments that run from a cryogenic -400°F to 1,200°F steam temperature up to 2,000 psi. Now you can standardize your gasket selection, they are available in popular shapes: Oval, obround, rectangular, round, and square