Plastic film and paper testing

This standard specifies the determination of the water vapor permeability of plastic materials in a test cup containing a desiccant. This standard is applicable to the determination of the water vapor permeability of plastic films (including composite plastic films), sheets, artificial leather, and other materials. Definition 21 Water Vapor Permeability (wVT) - The amount of water vapor that a 1 m 'sample can penetrate within 24 hours under specified temperature, relative humidity, a certain water vapor pressure difference, and a certain thickness. 2.2 Water Vapor Permeability Coefficient (P,) - The amount of water vapor that passes through a unit thickness and unit area of a sample per unit time and unit water vapor pressure difference in a specified temperature and relative humidity environment. The principle of this standard is to maintain a certain water vapor pressure difference on both sides of the sample under specified temperature and relative humidity conditions, measure the water vapor volume of the selected sample, and calculate the water vapor transmittance and water vapor transmittance coefficient

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6. If urgent or priority processing is required

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