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1.1 These test methods cover the determination of the rate at which water vapor passes through films of paint, varnish, lacquer, and other organic coatings. The films may be free films or they may be applied to porous substrates.
1.2 Two test methods are covered as follows:
1.2.1 Test Method A—Dry Cup Method, and
1.2.2 Test Method B—Wet Cup Method.
1.2.3 Agreement should not be expected between results obtained by different methods or test conditions. The method that most closely approaches the conditions of use should be selected.
1.3 The values stated in inch-pound units are to be designated as the standard. Factors for conversion are stated in 22.214.171.124 and 126.96.36.199.
1.4 This standard does not purport to address the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
D1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
D1193 Specification for Reagent Water
D4708 Practice for Preparation of Uniform Free Films of Organic Coatings
E96 Test Methods for Water Vapor Transmission of Materials
E104 Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions
ICS Number Code 25.220.60 (Organic coatings)
UNSPSC Code 46181533(Protective coats)
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ASTM D1653-03, Standard Test Methods for Water Vapor Transmission of Organic Coating Films, ASTM International, West Conshohocken, PA, 2003, www.astm.orgBack to Top