These full-face flange gaskets are made of inorganic fibers that are blended with a Buna-N binder. The compressed fiber is resistant to high temperatures and doesn’t lose thickness, or creep, when force is applied. Full-face gaskets cover the entire surface area of the flange and include holes to insert flange bolts and ease alignment. The gasket extends to the outside diameter of the flange which prevents dirt and contaminants from entering the joint. These gaskets are typically used with flat-face (FF) flange fittings so that the mating flange components fit flush against the gasket. Full-face gaskets require the joint to be disassembled to install.