IS 3400 Pt.21-1980

标准号：IS 3400 Pt.21-1980
发布日期：1981/2/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 This standard ( Part XXI ) prescribes the method for determination of permeability of vulcanized rubbers to gases at steady state condition, when a constant pressure is maintained on each of the end faces of the rubber to be tested. Results obtained by this test procedure should not be extra-polated to thickness of material considerably different from that of the test piece.1.1.1 This method applies to solid rubber of a hardness not less than 35 IRHD and to gases, such as air, nitrogen, oxygen, hydrogen, liquefied petroleum gas (in gaseous form ) and coal gas. Errors may be introduced if the gas used, appreciately swells the rubber under test.