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Full Description

This document describes general test methods for determining the water vapour transmission rate of sheet materials by means of a dynamic gas method or a static gas method. Depending on the method and specific apparatus employed, materials up to 38 mm thick and with water vapour transmission rates in the range from 0,05 g/(m2·d) to 65 g/(m2·d) can be tested. The basis of the function of the instrumental techniques is briefly described. Advice on calibration is given in Annex B.

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Document History

  1. BS ISO 9932:2021

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    Paper and board. Determination of water vapour transmission rate of sheet materials. Dynamic sweep and static gas methods

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  2. BS 7406:1991


    Methods for determination of water vapour transmission rate of sheet materials (paper and board) by dynamic sweep and static gas methods

    • Historical Version