Moisture permeability (abbreviated as: MP): Moisture permeability is expressed in units of g/m2/24h. It means that under certain standard laboratory conditions, a specific humidity difference is formed on both sides of the sample, and water vapor enters through the sample. On the dry side, by measuring the change in weight of the moisture-permeable cup over time, parameters such as the water vapor transmittance of the sample can be obtained.
There are two testing methods for moisture permeability: straight cup and inverted cup;
Cup correcting method: American standard ASTME-96A, C, E; Japanese standard JISL-1099A1;
Cup pouring method: American standard ASTM-E96, Japanese standard test JIS-L1099B1;
This test uses pre-wash data!
Domestic outdoor practitioners and outdoor enthusiasts all call moisture permeability breathability, or moisture permeability directly called breathability. It is incorrect and imprecise to confuse these two terms together. Breathability and moisture permeability are completely different. This concept needs to be distinguished and correctly understood;
The fabrics with the above three functional indicators are called waterproof and breathable fabrics, also called windproof, waterproof, warm and breathable fabrics. The simple understanding is that rainwater from the outside cannot get in, and the sweat inside is discharged through the pores of the coating and membrane!
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