1、Designation:C126395(Reapproved 2015)Standard Test Method forThermal Integrity of Flexible Water Vapor Retarders1This standard is issued under the fixed designation C1263;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of las
2、t revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the visual determination of thethermal integrity of flexible water vapor retarders for thosematerials
3、classified under Specification C1136,includingplastic,foil,or paper and composites of two or more of thesematerials to temperatures listed in the specification or purchasecontract.The vapor retarders are intended for use at tempera-tures of 20 to 150F(29 to 66C).This test method does notcover mastic
4、s or barrier coatings applied in liquid form ormaterials intended for use as weather barriers.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered s
5、tandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenc
6、ed Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationC1136 Specification for Flexible,Low Permeance VaporRetarders for Thermal Insulation3.Terminology3.1 DefinitionsDefinitions of terms used in this testmethod will be found in Terminology C168.4.Significance and Use4.1 In m
7、any applications,the vapor retarders used on athermal insulation will be exposed to the temperatures listed in7.2.Cracking or delamination of the retarder under theseconditions would,in most cases,cause it to lose its effective-ness as a vapor retarder material.5.Apparatus5.1 1 in.(25 mm)Outside Dia
8、meter Solid,Mild SteelMandrel.5.2 Laboratory Oven,capable of maintaining 63F(2C)up to a temperature of 150F(66C).5.3 Laboratory Freezer,capable of maintaining 63F(2C)down to a temperature of 20F(29C).5.4 Room or Cabinet,capable of maintaining 73.4 6 3F(23 6 2C)and 50 6 2%relative humidity.5.5 Insula
9、ted Gloves.6.Test Specimen6.1 From each sampled vapor retarder,test three 1 ft(305mm)square specimens for each temperature extreme specified.7.Procedure7.1 Condition test specimen at a temperature of 73.4 6 3F(23 6 2C)and a relative humidity of 50 6 2%for a periodof 24 h.7.2 Expose the specimen and
10、the mandrel to the testtemperatures of 20 and 150F(29 and 66C)for a period of4 h.7.3 At the end of the exposure period,with specimen andmandrel at test temperatures,bend each specimen around themandrel once through an angle of 180 in 3 6 2 s so that theopposing sides are parallel.If the two surfaces
11、 of the testspecimen are materially different,six specimens shall be testedwith three specimens of each surface tested on the outside ofthe bend.NOTE1When test conditions specify both low temperature and hightemperature exposure conditions on the same vapor retarder,it is satis-factory to use the sa
12、me specimen or to select separate specimens for eachof the exposed temperatures,unless the specification or contract explicitlystates that exposure tests must be conducted on the same specimen.If thelatter is so,the test specimen must be reconditioned before submitting itto the next test temperature
13、.7.4 Immediately examine each specimen,while in the bentcondition,for any cracks or delamination.1This test method is under the jurisdiction ofASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.33Current edition approved Aug.1,2015.Published September 2015.O
14、riginallyapproved in 1994.Last previous edition approved in 2005 as C1263 95(2010).DOI:10.1520/C1263-95R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards
15、Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE2Where multiple specimens are being examined,it is permis-sible to remove the tested specimen,while still in the bent condition,fromthe mandrel t
16、o allow for rapid reuse of the mandrel.The specimen mustbe restrained in the bent condition with paper clips or other suitable meansuntil it returns to room temperature and is then examined.7.5 To inspect for delamination,let each specimen return toroom temperature,open to a flat condition and examine.7.6 Any visible evidence of cracking or delamination on anyof the three specimens shall constitute failure.8.Report8.1 Report the following information:8.1.1 Identification of the material tested,i
