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ASTM D 6701 Water Vapor Transmission Rate




ASTM D 6701


Water Vapor Transmission Rate


The ASTM D 6701 test method covers a procedure for determining the rate of water vapor transmission ranging between 500 to 100,000 g/m2day through nonwoven and plastic barrier materials. The method is applicable to films, barriers consisting of single or multilayer synthetic or natural polymers, nonwoven fabric, and nonwoven fabrics coated with films up to 3 mm (0.1 in.) in thickness.

Significance and Use

The purpose of this test method is to obtain values for the water vapor transmission rate of barrier materials.

Water vapor transmission rate is an important property of materials and can be related to shelf life; product stability, breath-ability, and wearing comfort.

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