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Description of ASTM-C1878 2019ASTM C1878-19Active Standard: Standard Test Method for Surface Water Resistance of Vapor Retarders for Thermal InsulationASTM C1878Scope 1.1 This test method details a procedure for the determination of the surface water resistance of a vapor retarder by measurement of the quantity of water absorbed in a specified time by the service-exposed surface of a vapor retarder intended for use on thermal insulation. 1.2 This test method covers vapor retarders that are expected to withstand intermittent or occasional exposure to liquid water on the exposed side. Examples of this exposure are condensation and light rain during installation before a structure is enclosed. 1.3 This method does not cover vapor retarders intended for exposure to the elements in outdoor applications. 1.4 This method does not cover thermal insulation products that also act as vapor retarders, such as elastomeric foam and cellular glass. 1.5 In the test, the specimen is exposed to a specified volume of water over a given exposure area, with a resultant head pressure. 1.6 The test method is based on Test Method D3285 (withdrawn), the so-called “Cobb” test used for paper. 1.7 The values stated in SI units are to be regarded as standard. 1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. Keywords Cobb test; surface water resistance; ICS Code ICS Number Code 91.100.50 (Binders. Sealing materials) DOI: 10.1520/C1878-19 This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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