BS 7406 91st Edition, January 31, 1991
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
Published By:British Standards Institution (BSI)
Can measure WVTR's as low as 0.05 g/(m2.d) and be used on materials up to 38 mm thick.