BS 903-A30:1996 - Physical testing of rubber - Determination of permeability to gases
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This International Standard describes two procedures for measuring the permeability of rubber to gases
under steady-state conditions. One uses a horizontal measuring device for measurements at constant
pressure and the other uses a vertical measuring de- vice for measurements at constant volume or con-stant pressure. The results obtained by these procedures may be extrapolated to thicknesses of material different from that of the test piece providing the rubber is homogeneous and isotropic. The procedures apply to solid rubber of hardness not
less than 35 IRHD and to gases such as air, nitrogen, oxygen, hydrogen, liquified petroleum gas (in gaseous
form) and coal gas. Errors may be introduced if the gas used appreciably swells the rubber under test.