... :R11-105,RX20-215,BX150-303,Inch1/2"-24" Ring joint gasket (RTJ gasket) are manufactured in accordance with JPI-7S23 ... B16.20 and API 6A used on the ring type joint flanges specified in JPI-7S-15, ANSI B16.5, API ... Temperature(degrees)soft iron90450carbon steel120450F51150540304160600316160600michael at rilson com cn Ring Joint Gasket