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In the ASTM E96 standard developed by the American Testing and Materials Association (ASTM), test methods for determining the water vapor transmission of materials such as paper, plastic films, other sheet materials, chipboards, gypsum and plaster products, wood products and plastics where water vapor transmission is important are presented. The test methods here are limited to materials not more than 32 mm thick, except as specified. The full name of this standard is as follows: ASTM E96 / E96M-16 Standard test methods for water vapor transmission of materials.
Two basic methods are presented for measuring permeability in accordance with this standard: the desiccant method and the water method. There are also two variations: wet service conditions on one side and service conditions with low humidity on one side and high humidity on the other.
The purpose of the test methods described in the ASTM E96 standard is to obtain reliable water vapor transfer values expressed in appropriate units from permeable and semi-permeable materials with simple devices. These values are used in design, production and marketing activities. However, a permeability value obtained under a number of test conditions may show different values under different conditions. Therefore, the test conditions that are closest to the usage conditions should be selected. When reporting the conditions used, the standard conditions that are useful are included in the standard appendix.
Briefly, the tests here evaluate the water vapor transfer through semi-permeable and permeable samples. The data is used by manufacturers and designers and is often used by amIt is important in ballast applications.
While testing, it is filled with distilled water leaving a small gap between the sample and the water. The container is then sealed to prevent loss of steam. An initial weight of the apparatus is taken and then regularly weighed over time until the results are linear. Care must be taken to ensure that all weight loss is due to water vapor transmission through the sample.
With the experience gained over many years, our organization also provides standard testing services for ASTM E96 / E96M-16 materials for water vapor transmission within the framework of laboratory services of materials with a trained and expert staff.
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