ASTM C1263-95 (R2021) pdf free download.Standard Test Method for Thermal Integrity of Flexible Water Vapor Retarders.
1 .1 This test method covers the visual determination of the thermal integrity of flexible water vapor retarders for those materials classified under Specification Cl 136, 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 temperatures 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 he 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.
4. Significance and Use
4.1 In many applications, the vapor retarders used on a thermal insulation will he 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 effectiveness as a vapor retarder material.
5. Apparatus
5. 1 1 in. (25 nun) Outside I)iameter Solid, Mild Steel Mandrel.
5.2 Laboratory Oven, capable of maintaining ±3°F (2°C) up to a temperature of 150°F (66°C).
5.3 Laboratoi Freecer, capable of maintaining ±3°F (2°C) down to a temperature of —20°F (—29°C).
5.4 Room or cabinet, capable of maintaining 73.4 ± 3°F (23 ± 2°C) and 50 ± 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 ± 3°F (23 ± 2°C) and a relative humidity of 50 ± 2 % for a period of 24h.
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 4h.
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 ± 2s 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.ASTM C1263 pdf download.