Ring Type Joints Gasket

As a result of metal to metal sealing media they are made to be free of indentations, tool marks etc and have a surface finish of maximum:R, RX – 63 microinches Ra (1.6 micrometer Ra).
BX – 32 microinches Ra (0.8 micrometer Ra).
The working of ring joint gaskets can be explained by the axial compressive load causing them to deform and flow to irregularities in the flange grooves that it seals. As load bearing area of ring joint gaskets are small high surface stresses are produced between the sealing face and the groove, making it poor in recovery characteristics and unfit for reuse.