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Water vapor permeability

Determining water vapor permeability: how well does your paint "breathe"?

The water vapor permeability test is used to determine the “breathability” of a paint. This is an important property, because water vapor permeability allows moisture to escape from walls without problems such as the formation of blisters, cracks and mold.

We use ISO 7783 to perform this test.

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How do we determine water vapor permeability?

A film is made from the paint to be examined. If the paint is not sufficiently self-supporting, the film is made on a porous support. The film is then stretched over a special permeability cup. Depending on the chosen method (wet or dry cup), this is placed in a dry or very humid environment. The weight of the cup with contents is weighed daily, until the moment when the decrease or increase in weight is within the limits set in the standard.

Based on the time, the layer thickness, the surface of the film and the weight, we calculate the water vapor permeability of the paint.

Reporting and advice

Within five working days of completing the water vapor permeability test, you will receive a report with the results. After reading the report, you may still need advice on how to improve the quality of the product. As specialists in the field of industrial surface treatment, our staff always have advice to help you with this.

Call +31 (0)13 463 06 88 for more information on turnaround times for your required laboratory tests.