pipe fitting gasket, also calledflange gaskets, it produced by wide range of materials: such as rubbers, non-asbestos, and graphite,PTFE .
we are a factory for rubber & PTFE . we offer thise gasket as customer's request .
As a general rule, you should chose the thinnest material possible for your application.
Gaskets can be bought either full faced (i.e. with bolt holes), or inner bolt circle .