We are offering an Expanded PTFE Gasket, which is made from PTFE sheet gasket material. This all-purpose gasket can take the place of all other PTFE gasket varieties. All hostile chemicals in the pH range of 0 to 14 will be sealed, with the exception of molten alkali metals and elemental fluorine. Our PTFE gasket, which is not only resistant to chemical attack but also will not contaminate or alter the color of finished goods.