Non Metallic Gasket A non metallic gasket uses zero metal in it composition. Nonmetallic gasket relates to a gasket material that is easily compressed under bolt load. These Non- Metallic Gasket (know as soft gasket) material can be chosen from a large variety of elastomers, compressed non-asbestos, PTFE, flexible graphite and high temperature sheet products. These are used in a large range of applications such as pipe flanges, heat exchanges, compressors, and bonnet valves. It can be bought in a variety of cut shapes or be found in sheet or rolls. For different types of gasket, click here.