Water vapor transmission rate (WVTR) is the steady-state rate at which water vapor passes through a film under certain temperature and relative humidity conditions.
-testleri.jpg "WVTR (Water Vapor Transmission Rate) Tests")
A critical function of flexible packaging is to keep potato chips, bagels, cookies and similar dry products and cheese, cakes, chewing gum and similar moist products moist. Without protective packaging, products quickly gain or lose moisture until they reach equilibrium with the relative humidity around them. At this point, crunchy products are wet, chewy products are hard and dry.
Water vapor transmission rate is the standard measurement for the ability of films to resist moisture transmission, with lower values indicating better moisture retention.
Briefly, the water vapor transfer rate is the amount of water vapor that passes through a substance or material for a certain period of time. Knowing this value is an important factor in controlling humidity across a wide range of products. Manufacturers in many different industries use strict moisture control methods to ensure the integrity and shelf life of products, including food, pharmaceuticals and building materials.
To control moisture in other applications, such as food packaging, manufacturers rely on a combination of barrier coatings and product packaging.
Measurements for controlling humidity vary widely by industry and application. Some industries use gravimetric techniques that measure moisture gain or loss by mass, while others use specialized instrumentation and standards.
The conditions in which products are manufactured, shipped, and applied are an important factor for moisture management, and these conditions greatly affect how testers measure water vapor transmission rate (WVTR).
The ASTM E96/E96M-16 standard, developed by the American Testing and Materials Organization (ASTM), defines standard test methods for water vapor transmission of materials. These test methods include determining the water vapor transmission of materials for which water vapor transmission is important, such as paper, plastic films, other board materials, fibreboards, gypsum and gypsum products, wood products and plastics.
Our organization also provides WVTR (water vapor transmission rate) testing services 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.
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