Water Vapor Transmission Rate ASTM F1249

Water Vapor Transmission Rate ASTM F1249

Determination of Water Vapor Transmission Rate (WVTR) Using a Modulated Infrared Sensor to Measure Permeation of Flexible Barrier Materials is done by ASTM F1249. WVTR is an important property of packaging materials and is most often related directly to shelf life and packaged product stability.


    A water vapor transmission rate (WVTR) or moisture vapor transmission rate (MVTR) is a method to measure the passage of water through a material. This analysis tool using ASTM F1249 helps to calculate or measure the permeability of vapor barriers. In packaging or other industrial applications, finding the rate of vapor transmission through flexible materials is very important. The main important factors involved in the material permeation are the thickness of the material and environmental factors like temperature, relative humidity. Reliable values for the WVTR of plastic film and sheeting are determined through this test. 

    Test Procedure:

    Distilled water is filled in a cup, and a small gap of air space is maintained between the specimen and water. The cup is then sealed, except for the test sample, to avoid vapor loss. The apparatus is weighed at first, and then at regular intervals before the effects become linear. To ensure that all weight loss is due to water vapor transfer through the specimen, the experiment must be carefully monitored. 

    Sample size:

    A sample of 4 x 4 inches is generally used


    The obtained data is plotted as weight vs time or transmission percentage vs time.


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