The ASTM D6701-21 standard, published by the American Society for Testing and Materials (ASTM) , describes a test method for determining water vapor transmission rates ranging from 500 to 100,000 g/(m²·day) through nonwoven and plastic barrier materials. This test method is applicable to films, barriers made of single or multi-layer synthetic or natural polymers, nonwoven fabrics, and nonwoven fabrics coated with films up to 3 mm thick. This test method...
The purpose of this test method is to obtain the water vapor transmission rate values of the barrier materials. Water vapor transmission rate is an important property of materials and is related to shelf life, product stability, breathability and comfort of use. Moisture vapor transmission rate, also called water vapor transmission rate, is the amount of water vapor that passes through a substance or material over a given period of time. Knowing this value is an important factor in controlling moisture in a wide variety of products. Manufacturers in many different industries use strict moisture control methods to ensure the integrity and shelf life of their products, including food, pharmaceuticals and building materials. For example, coatings based on polymer emulsions have been developed to help control moisture, such as liquid applied membranes in the construction industry. To control moisture in other applications, such as food packaging, manufacturers rely on a combination of barrier coatings and product packaging.
When developing vapor barriers, the range of temperature and humidity levels the application will encounter throughout its lifecycle is evaluated to ensure the barrier provides optimum moisture management . The design of a barrier material has one of the greatest impacts on the rate of moisture vapor transmission. Depending on the product or application design, testing other aspects of material design, such as seams, folds, and openings, is equally critical for effective moisture management.
Our organization provides standard testing services for the determination of water vapor transmission rates over nonwoven and plastic barriers within the scope of ASTM D6701-21 standard, with its trained and expert staff and advanced technological equipment, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors. also gives.
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