Nonwoven standard procedures (NWSP) are designed to provide a standard set of test methods for the various properties desired in nonwoven and engineered fabrics. One of these is the NWSP 500.RO (100) standard for determining water vapor transmission rates between 070.4 and 15 thousand grams per square meter per day.
In this regard, the ASTM D6701-16 standard, also published by the American Society for Testing and Materials (ASTM), provides a test method for determining the water vapor transmission rate ranging from 500 to 100.000 g / m2 / day from non-woven and plastic barrier materials. The full name of this standard is as follows: ASTM D6701-16 Standard test method for determining water vapor transmission rates across nonwoven and plastic barriers.
The test method in the said standard covers films, barriers made of single or multi-layer synthetic or natural polymers, non-woven fabrics and non-woven fabrics covered with films up to 3 mm in thickness.
The purpose of the test method in both standards 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. The data obtained from these test methods are considered appropriate as a peer testing method, provided that the buyer and seller have agreed on the sampling processes, test conditions and acceptance criteria.
Briefly, these test methods are applied to determine the water vapor transmission rate and water vapor permeability.
Moisture vapor transmission rate, sometimes referred to as water vapor transmission rate, is a measure of the passage of water vapor through a substance over a period of time. There are many industries that require a high level of humidity control to ensure the integrity and shelf life of products, including foods, pharmaceuticals and building materials. A combination of coating and product packaging is being developed to control moisture that can be found in food packaging, while coatings are being developed to control the moisture found in liquid applied membranes in the construction industry.
With the experience gained over many years, our organization also provides water vapor transmission rates between 070.4-15 g / m500 / day, within the framework of laboratory services of the materials with a trained and expert staff, to the enterprises that demand.
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