Specifies requirements for cork compsition sheets for gaskets made by the compounding of granular cork with natural or synthetic rubber.
1.1 Three types of sheets are covered, and within each type, three grades. Type A is non-oil resistant, Type B has a good resistance to oil and Type C has a very good resistance to oils and petrols.
IS 4253 Pt.2-1980 history
1980IS 4253 Pt.2-1980 Specification for Cork Composition List Part II Cork AMD Rubber