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BS 7406:1991 Methods for determination of water vapour transmission rate of sheet materials (paper and board) by dynamic sweep and static gas methods
standard by BSI Group, 01/31/1991
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Can measure WVTR's as low as 0.05 g/(m^2.d) and be used on materials up to 38 mm thick.Cross References:
BS 3177
BS 3430
BS 3431