The films may be free films or they may be applied to porous substrates. The method that most closely approaches the conditions of use should be selected.
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Telecommunications Standards. AWS D1. Means, Inc. Active Only. Complete Document. Includes all amendments and changes through Reapproval Notice , Detail Summary View all details. Factors for conversion are stated in They run essentially the same kinds of tests as in the ASTM methods, but do so instrumentally. However, it appears that no side-by-side tests have been run comparing results from measurements with such instruments to these ASTM methods for precision and accuracy.
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All paint and coatings are permeable to water, just to different degrees. See the slide below for more information about the correction. Materials can be classified by the magnitude of their permeance as follows.
It can also be produced by the boiling of water, but the steam that you can see coming out x your kettle technically is not water vapor. Absorption of water may make a coating less dense, thus allowing moisture to diffuse easily and cause a much higher moisture vapor transmission rate, WVTR than would occur in drier environments.
In either case, the slope of the plot is the rate f weight change and its units are mass per time. Water vapor is the aztm phase of water. The films may be free films or they may be applied to porous substrates. If the container is filled with desiccant, the method is called the dry cup method or the desiccant method.
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