... : carbon steel ,stainless steel 304,316,321,soft iron. Shapes: lens , octagonal ,or ellipticTechnical data: temperature: -200~800oC pressure: 0~40MpaApplication ... high temperature and pressure pipingsIt is widely applied in petroleum processing,oil refining ,electricity generated by firepower,textile and other light ... of nature gas,valve etc. Ring joint gasket(Seal gasket, lens gasket, RTJ gasket)