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ASTM C1263-95(R2021) pdf free download

ASTM C1263-95(R2021) pdf free download.Standard Test Method for Thermal Integrity of Flexible Water Vapor Retarders
1. Scope
1.1 This test method covers the visual determination of the thermal integrity of flexible water vapor retarders for those materials classified under Specification C1136, including plastic, foil, or paper and composites of two or more of these materials to temperatures listed in the specification or purchase contract. The vapor retarders are intended for use at tempera- tures of −20 to 150°F (−29 to 66°C). This test method does not cover mastics or barrier coatings applied in liquid form or materials intended for use as weather barriers. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Significance and Use
4.1 In many applications, the vapor retarders used on a thermal insulation will be exposed to the temperatures listed in 7.2. Cracking or delamination of the retarder under these conditions would, in most cases, cause it to lose its effective- ness as a vapor retarder material.
5. Apparatus
5.1 1 in. (25 mm) Outside Diameter Solid, Mild Steel Mandrel. 5.2 Laboratory Oven, capable of maintaining 63°F (2°C) up to a temperature of 150°F (66°C). 5.3 Laboratory Freezer, capable of maintaining 63°F (2°C) down to a temperature of −20°F (−29°C). 5.4 Room or Cabinet, capable of maintaining 73.4 6 3°F (23 6 2°C) and 50 6 2 % relative humidity. 5.5 Insulated Gloves.
6. Test Specimen
6.1 From each sampled vapor retarder, test three 1 ft (305 mm) square specimens for each temperature extreme specified.
7. Procedure
7.1 Condition test specimen at a temperature of 73.4 6 3°F (23 6 2°C) and a relative humidity of 50 6 2 % for a period of 24 h. 7.2 Expose the specimen and the mandrel to the test temperatures of −20 and 150°F (−29 and 66°C) for a period of 4 h. 7.3 At the end of the exposure period, with specimen and mandrel at test temperatures, bend each specimen around the mandrel once through an angle of 180° in 3 6 2 s so that the opposing sides are parallel. If the two surfaces of the test specimen are materially different, six specimens shall be tested with three specimens of each surface tested on the outside of the bend. N OTE 1—When test conditions specify both low temperature and high temperature exposure conditions on the same vapor retarder, it is satis- factory to use the same specimen or to select separate specimens for each of the exposed temperatures, unless the specification or contract explicitly states that exposure tests must be conducted on the same specimen. If the latter is so, the test specimen must be reconditioned before submitting it to the next test temperature. 7.4 Immediately examine each specimen, while in the bent condition, for any cracks or delamination. N OTE 2—Where multiple specimens are being examined, it is permis- sible to remove the tested specimen, while still in the bent condition, from the mandrel to allow for rapid reuse of the mandrel. The specimen must be restrained in the bent condition with paper clips or other suitable means until it returns to room temperature and is then examined. 7.5 To inspect for delamination, let each specimen return to room temperature, open to a flat condition and examine. 7.6 Any visible evidence ofcracking or delamination on any of the three specimens shall constitute failure.

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