... be the first choice for sealing gaskets RTJ Gasket(gasket ring,seal gasket)Raw materials: carbon steel ,stainless steel 304,316 ... ,321,soft iron. Shapes: lens , octagonal ,or ellipticTechnical data: temperature: -200~800oC pressure: 0~ ... other light industries ,pharmacy ,pipeline of nature gas,valve etc. Ring joint gasket(Seal gasket, lens gasket, RTJ gasket)