... , Factory price We can offer all kinds of PTFE sealing gaskets made of virgin PTFE(standard and modified),and filled grade ... compound) from Dupont,Daikin,3M,Dongyue,3F,etc.PTFE envelope gaskets usually combine PTFE envelope layer and other insert material. ... generally are non metallic material, further improving the resilience and sealing performance of the gasket. Temperature: up to 250℃ (depending ...