... surface, high accuracy and excellent perfomance, 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: 0~40MpaApplication ... of nature gas,valve etc. Ring joint gasket(Seal gasket, lens gasket, RTJ gasket)