Metallic gaskets are fabricated from one or a combination of metals to the desired shape and size. Often used metallic gaskets are ring-type-joint gaskets (RTJ). They are always applied to special, accompanying flanges which ensure good, reliable sealing with the correct choice of profiles and material.
A gasket sheet - often referred to as 'gasket paper', despite usually being made from silicone rubber, cork, nitrile or any other robust flexible material - is a large piece of sheeting intended to be used in making quick, cost-effective gaskets (seals), for joining surfaces or components together.