STANDARD TEST METHODS FOR WATER VAPOR TRANSMISSION OF MATERIALS
|Publication Date:||31 October 1980|
|ICS Code (Other methods of testing of metals):||77.040.99|
These methods cover the determination of water vapor transmission (WVT) of materials through which the passage of water vapor may be of importance, such as paper, plastic mms, other sheet materials, fiberboards, gypsum and plaster products, wood products, and plastics. The methods are limited to specimens not over 1 1/4 in. (32 mm) in thickness except as provided in Section 9. Two basic methods, the Desiccant Method and the Water Method, are provided for the measurement of permeance, and two variations include service conditions with one side wetted and service conditions with low humidity on one side and high humidity on the other. Agreement should not be expected between results obtained by different methods. That method should be selected which more nearly approaches the conditions of use.
The values stated in inch-pound units are to be regarded as the standard. Metric inch-pound conversion factors for WVT, permeance, and permeability are stated in Table 1. All conversions of mm Hg to Pa are made at a temperature of o°C.