This standard prescribes the requirements and the methods of sampling and test for sheet rubber jointing and rubber insertion jointing for use between flanges and similar joints subjected to water pressure, air pressure or low pressure steam.
Note — The recommended low pressure steam is up to 350 kN/m2 ( approximately 3·5kgf/cm2).
IS 638-1979 history
1979IS 638-1979 Specification for sheet rubber joints and rubber insert joints