ASTM C793-2005(2010) Standard Test Method for Effects of Laboratory Accelerated Weathering on Elastomeric Joint Sealants《加速风化对弹性接缝密封胶影响的标准试验方法》.pdf
《ASTM C793-2005(2010) Standard Test Method for Effects of Laboratory Accelerated Weathering on Elastomeric Joint Sealants《加速风化对弹性接缝密封胶影响的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C793-2005(2010) Standard Test Method for Effects of Laboratory Accelerated Weathering on Elastomeric Joint Sealants《加速风化对弹性接缝密封胶影响的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C793 05 (Reapproved 2010)Standard Test Method forEffects of Laboratory Accelerated Weathering onElastomeric Joint Sealants1This standard is issued under the fixed designation C793; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、 revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test meth
3、od covers a laboratory procedure fordetermining the effects of accelerated weathering on cured-in-place elastomeric joint sealants (single- and multicomponent)for use in building construction.1.2 The values stated in SI units are to be regarded as thestandard. The values in parentheses are for infor
4、mation only.1.3 The committee with jurisdiction over this standard is notaware of any comparable standards published by other ASTMcommittees or other organizations.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the
5、 user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and SealantsC1442 Practice for Conducting Tests on Sealants UsingArtifici
6、al Weathering ApparatusG151 Practice for Exposing Nonmetallic Materials in Ac-celerated Test Devices that Use Laboratory Light Sources3. Terminology3.1 DefinitionsSee Terminology C717 for applicable defi-nitions of the following terms: cure, elastomeric, joint, sealant,and substrate.4. Summary of Te
7、st Method4.1 Three sealant specimens are spread on aluminum platesand exposed in one of the laboratory accelerated weatheringchambers specified in Section 6 and operated in accordancewith specifications in Section 8 and Practice C1442.4.2 Following this treatment the specimens are exposed for24 h in
8、 a freezer maintained at 26 6 2C (15 6 4F).4.3 At the end of the cold exposure, the specimens are bentover a mandrel within1satthespecified temperature.5. Significance and Use5.1 It is known that solar radiation contributes to thedegradation of sealants in exterior building joints. The use of alabor
9、atory accelerated weathering machine with actinic radia-tion, moisture and heat appears to be a feasible means to giveindications of early degradation by the appearance of sealantcracking. However, simulated weather factors in combinationwith extension may produce more severe degradation thanweather
10、 factors only. Therefore, the effect of the weatheringtest is made more sensitive by the addition of the bending ofthe specimen at cold temperature.6. Apparatus6.1 Exposure ApparatusThe exposure apparatus shall beone of the three types of laboratory accelerated weatheringdevices described in Practic
11、e C1442 that use either xenon arc,fluorescent UV, or open flame carbon arc radiation. ConsultPractice C1442, Section 7 for the differences in test parametersamong the devices. Because of differences in test conditions,test results may differ with the type of device used. The choiceof device shall be
12、 by mutual agreement among the interestedparties.6.2 Freezer or Cold Box, having a temperature controlledat 26 6 2C (15 6 4F).6.3 Rectangular Brass Frame, with inside dimensions 130by40by3mm(5by112 by18 in.).6.4 Aluminum Plates, three, each 152 by 80 by 0.3 mm (6 by3 by 0.01 in.).6.5 Steel Mandrel,
13、12.7 mm (12 in.) in diameter and about102 mm (4 in.) long.6.6 Thin-Bladed Knife.6.7 Straightedge, metal or plastic, about 152 mm (6 in.)long.6.8 Spatula, steel, about 152 mm (6 in.) long.1This test method is under the jurisdiction ofASTM Committee C24 on BuildingSeals and Sealants and is the direct
14、responsibility of Subcommittee C24.40 onWeathering.Current edition approved June 1, 2010. Published July 2010. Originally approvedin 1975. Last previous edition approved in 2005 as C793 05. DOI: 10.1520/C0793-05R10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM
15、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 Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Standard Test Conditions7.1
16、Unless otherwise specified by those authorizing the test,standard conditions shall be as described in Terminology C717.8. Procedure8.1 Test of Multicomponent Sealants:8.1.1 Condition at least 200 g of base compound andappropriate amount of curing agent and pigment, if required, ina closed container
17、for at least 24 h at standard conditions; thenmix thoroughly for 5 min.8.1.2 Fill the brass frame, after centering it on the aluminumplate, with a portion of the mixed compound and strike if offflat with a straightedge. Immediately lift the frame from thesealant after separating it by running a thin
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