ASTM E96 is a standard test method for measuring the water vapor transmission rate of materials. It is based on the following principle:

When materials and water vapor are in different humidity environments, the water vapor will move from the high-humidity environment to the low-humidity environment, a process called water vapor diffusion. The water vapor transmission rate of the material is to reflect the rate of water vapor diffusion of the material index.

ASTM E96 test method is divided into two kinds: dry conduction method and humidity difference method. The dry conduction method is to install the sample in a box with a dry environment, and then calculate the water vapor transmission rate by detecting the change in the weight of moisture in the material within a certain period of time. The humidity difference method is to install the sample between two environments with different humidity and calculate the water vapor transmission rate by detecting the change of moisture in the two environments.

With these two methods, ASTM E96 can measure the water vapor transmission rate of various materials, such as paper, plastic film, coating materials, fabrics, etc. This test method is widely used in construction materials, plastic films, and fabrics. This test method is widely used in construction materials, packaging materials, garments, etc.

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