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Comparison of Test Methods for Moisture Permeability

       Textile moisture permeability refers to the performance of sweat through the fabric, also known as permeable steam, is reflected in the body when the heat to maintain the body heat and heat dissipation of one of the indicators of heat balance.Moisture permeability:(G / m2.h) or grams per square meter of 24 hours (g / m2.h) per gram per square meter of water vapor per unit area of ​​the sample in the specified time under the condition of maintaining the specified temperature and humidity conditions on both sides of the sample, M2.24h).Moisture:(G / m2.Pa.h) per square meter per square meter of water vapor per unit area of ​​the sample, which is vertically passed through the unit water vapor pressure under the condition of the specified temperature and humidity conditions. 

 TheGB, European standard, American standard, the Japanese standard has a moisture permeability test standards, these standards are tested moisture permeability index. From the method point of view, there are mainly absorbent method and evaporation method - positive cup / evaporation method - inverted cup.Moisture method (desiccant):The moisture permeable cup containing the hygroscopic desiccant and sealed with the fabric sample is placed in a sealed environment of the specified temperature and humidity. The moisture permeability of the sample is calculated according to the change of the moisture quality of the moisture permeable cup (desiccant absorb moisture) in a certain period of time Rate, moisture permeability unit in grams per square meter for 24 hours.

 Evaporation method (positive cup method and inverted cup method):The moisture permeability of the sample is calculated according to the change of moisture content (moisture evaporation) of the moisture permeable cup in a sealed environment with a certain temperature of distilled water and sealed with a sample of the fabric.The moisture rate is in grams per square meter of 24 hours. Evaporation method is divided into the cup method and the inverted cup method, the cup method in the test process, the moisture level will be placed on the instrument, and pour the cup is inverted cup on the instrument, so that distilled water and test fabric Reverse direct contact. The pouring method is generally applicable to waterproof breathable fabrics.The difference between the two methods is to test the amount of water volatilization, one is to test the amount of moisture absorption, both are assessed by the performance of sweat through the fabric.

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