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BS 7406 91st Edition, January 31, 1991
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Methods for Determination of Water Vapour Transmission Rate of Sheet Materials (Paper and Board) by Dynamic Sweep and Static Gas Methods
Includes all amendments and changes through Reaffirmation Notice , November 1, 2013
Additional Comments: SAME AS ISO 9932
Page Count:14
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Can measure WVTR's as low as 0.05 g/(m2.d) and be used on materials up to 38 mm thick.