ASTM C1263:95(R2021) pdf free download – Standard Test Method for Thermal Integrity of Flexible Water Vapor Retarders.
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 effectiveness as a vaw retarder material.
5. Apparatus
5.1 in. (25 mm) Outside Dic,n,eier Solid, Mild Steel Mandrel.
5.2 Luhorciton Oven, capable of maintaining ±3°F (2°C) up to a temperature of 150°F (66°C).
5.3 Liihara:orv Freezer, capable of maintaining ±3°F (2°C) down to a temperature of —20°F (—29°C).
5.4 Riom or capable of maintaining 73.4 ± 3°F (23 ± 2CC) and 50 ± 2 % relative humidity.
5.5 Insulated Gloves.
6. Test Specimen
6.1 From each sampled vapor retarder, test three I 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 24 h.
7.2 Expose the specimen and the mandrel to the test temperatures of —20 and I SOF (—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 l80 in 3 ± 2 s so that the opposing sides are parallel. If the two surfaces of the test specimen arc materially dith,rcnt. six specimens shall be tested with three specimens of each surface tested on the outside of the bend.
Note I —When test conditions specify both low temperature and high tenipcraluxc exposure conditions on the same vapor retarder. it is satis factors to use the same specimen or to select separate specimens for each of the exposed temperatures, unless the spccitication or contract explicitly states that exposure tests must be conducted on the same specimen. If the latter is so, the tcsi specimen must be reconditioncd before submitting it to the test.
7.4 Immediately examine each specimen, while in the bent condition, for any cracks or delamination
Nmr 2—Where multiple specimens are being examined, it is pennissible to remtwc the tested specimen. while s*ill in the bent condition. from the mandrel to allow for rapid reuse of the mandrel. The specimen must be restrained in the bent condition ith paper clips or other suitabk means until ii returns to mom temperature and is then esamined.
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 of cracking or delamination on any of the three specimens shall Constitute failure.
1. Report
8.1 Report the following inkwmation.