ASTM C1257-2006a Standard Test Method for Accelerated Weathering of Solvent-Release-Type Sealants《溶剂释放型密封剂加速老化的标准试验方法》.pdf
《ASTM C1257-2006a Standard Test Method for Accelerated Weathering of Solvent-Release-Type Sealants《溶剂释放型密封剂加速老化的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1257-2006a Standard Test Method for Accelerated Weathering of Solvent-Release-Type Sealants《溶剂释放型密封剂加速老化的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C 1257 06aStandard Test Method forAccelerated Weathering of Solvent-Release-Type Sealants1This standard is issued under the fixed designation C 1257; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last rev
2、ision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method includes two laboratory acceleratedexposure procedures for predicting the effects of ultraviolet orultraviol
3、et/visible radiation, heat, and moisture on color, chalk-ing, cracking, and adhesion of solvent-release sealants.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety
4、 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.1.4 The committee with jurisdiction over this standard is notaware of any com
5、parable standards published by other orga-nizations.2. Referenced Documents2.1 ASTM Standards:2C 717 Terminology of Building Seals and SealantsC 1442 Practice for Conducting Tests on Sealants UsingArtificial Weathering ApparatusG113 Terminology Relating to Natural and ArtificialWeathering Tests of N
6、onmetallic MaterialsG 151 Practice for Exposing Nonmetallic Materials in Ac-celerated Test Devices that Use Laboratory Light SourcesG 154 Practice for Operating Fluorescent Light Apparatusfor UV Exposure of Nonmetallic MaterialsG 155 Practice for Operating Xenon Arc Light Apparatusfor Exposure of No
7、n-Metallic Materials3. Terminology3.1 Definitions3.1.1 Refer to Terminology C 717 and G113for definitionsof terms used in this test method.4. Summary of Test Method4.1 Four test specimens are prepared in U-shaped aluminumchannels. After curing, three of the specimens are exposed inthe laboratory acc
8、elerated weathering device and the fourthspecimen is stored under standard conditions as an unexposedfile specimen.At the end of the exposure period, the specimensare examined for chalking, color change, center cracking, edgecracking, and loss of adhesion versus the unexposed filespecimen.5. Signifi
9、cance and Use5.1 It is difficult to establish a precise correlation betweenlaboratory accelerated and natural weathering because of (1)geographical climatic variations, local weather variation fromnormal, and local pollutants and (2) the fact that the accelera-tion factor is material dependent, vary
10、ing with the type ofmaterial as well as its formulation. This test method is used todetermine the resistance of a sealant to laboratory acceleratedweathering and, if a control material with known outdoorweathering performance is used, the relative weathering per-formance of the sealant against that
11、of the control material.5.2 This test method is conducted using aluminum channels.Other substrate materials may show different results.6. Apparatus6.1 Exposure Apparatus:6.1.1 Fluorescent UV/Condensation Apparatus, that con-forms to the requirements in Practices G 151 and G 154 withUVA-340 type lamp
12、s.6.1.2 Xenon-Arc Apparatus, that conforms to the require-ments in Practices G 151 and G 155 with daylight type filters.6.2 Four-Mill Finish Aluminum U-Channels, 76 mm longby 19 mm wide by 9.5 mm deep (3 by34 by38 in.) insidedimensions. Additional substrate materials may be specified.6.3 Steel Spatu
13、la.1This test method is under the jurisdiction ofASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.40 onWeathering.Current edition approved Sept. 1, 2006. Published September 2006. Originallyapproved in 1994. Last previous edition approved in 2006
14、as C 1257-06.2For 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 Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor D
15、rive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Procedure7.1 Condition sufficient compound in an original closedcontainer for at least 24 h at standard conditions. Standardconditions are to be a temperature of 23 6 2C (73 6 3.6F)and relative humidity of 50 6 5%.7.2 Prepare four
16、 sealant test specimens in aluminumU-channels.7.2.1 Thoroughly clean channels using a suitable solventsuch as methyl ethyl ketone (MEK). Allow to dry before fillingwith sealant.7.2.2 Block the ends of the U-channels with masking tapeand overfill the entire channel with conditioned compoundfrom the b
17、ottom up being careful to avoid air entrapment.Strike the channel off flat with a spatula. Do not remove themasking tape. It is to stay in place for the entire test. Removingit may disturb the uncured or cured sealant.7.3 Cure the test specimens at standard conditions for 21days.NOTE 1The producer m
18、ay request conditions other than those speci-fied in 7.3 for the curing period, provided they meet the followingrequirements: the curing period must extend for 21 days, and thetemperature during the curing period shall not exceed 70C (158F).7.4 After the curing period, place three of the specimens i
19、none of the laboratory accelerated exposure devices listedbelow. Choice of the type of apparatus shall be by mutualagreement among the interested parties. Because of differencesin type of light source and test conditions, test results maydiffer with the type of apparatus used. Consult Practices G 15
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