Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes.
Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards.
Validating the specifications, value and safety of your raw materials, products and assets.
Maximizing the comfort and function of outdoor and active wear
Water-vapor permeability is also known as the water-vapor transmission rate (WVTR). It indicates breathable performance of textiles, and is a measure of the passage of water vapor through materials. Proper selection and manufacture of materials with high water-vapor permeability can assure comfort for the wearer, especially during outdoor activities.
Water-vapor permeability can be verified by testing the water-vapor transmission through a unit of area under specified conditions of temperature and humidity. Intertek provides a full range of water-vapor permeability tests to help apparel manufacturers improve product quality.
Permeable Cup Method
Permeable Cup is the method normally used to test water-vapor permeability. Water-vapor permeability is calculated after testing the water-vapor transmission rate of the specimen under specified temperatures and relative humidity. The test can be carried out into two ways* based on the same testing principle: Desiccant Method in which water vapor transmits into the test dish, and Water Method in which water vapor transmits out of the test dish.
* Since the environmental conditions and set-up of each method differ, results from one standard are not comparable to those of another.
The result is expressed in grams of water vapor per square meter of fabric per 24-hour period.
Sweating Guarded Hotplate Method
This method determines the water-vapor resistance of textiles by placing the specimen on the sweating hotplate, which simulates the water-vapor transfer processes through materials next to the human skin. Higher water-vapor resistance means weaker breathability.
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