Pipe flange ring joint gasket 1.R,RX,BX type 2.304,321,347,F5, ... ASNI , EN and so on. MaterialHardnessTemperatureSignHB Soft Iron90540DCarbon Steel120540S410SS170600410304SS160760304316SS160760316347SS160925347 R-Type, Oval Type Standard oval type metal ring joint gasket ... is applied to flange with standard fillister.R-Type, Octagonal TypeStandard octagonaltype metal ring joint gasket is ...