ASTM C1442-2011 Standard Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus《用人工风化仪对密封件进行试验的标准实施规范》.pdf
《ASTM C1442-2011 Standard Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus《用人工风化仪对密封件进行试验的标准实施规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1442-2011 Standard Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus《用人工风化仪对密封件进行试验的标准实施规范》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation:C144206 Designation: C1442 11Standard Practice forConducting Tests on Sealants Using Artificial WeatheringApparatus1This standard is issued under the fixed designation C1442; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, 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.1. Scope1.1 This practice covers three types of laboratory weathering exposure procedures for evaluating the effec
3、t of actinic radiation,heat, and moisture on sealants.1.2 The exposure sources used in the three types of artificial weathering devices are the filtered xenon arc, fluorescent ultravioletlamps, and open flame carbon arc based on Practices G155, G154, and G152, respectively.1.3 The values stated in S
4、I units are to be regarded as the standard. The values given in parentheses are provided for informationonly.1.4 The ISO standard related to this Practice is ISO 11431. Significant differences exist between the procedures. The ISOspecimens are exposed through glass and are elongated prior to examina
5、tion for loss of adhesion or cohesion, or both, followingexposure.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the app
6、licability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and SealantsG113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic MaterialsG141 Guide for Addressing Variability in Exposure Testing of Nonmeta
7、llic MaterialsG147 Practice for Conditioning and Handling of Nonmetallic Materials for Natural and Artificial Weathering TestsG151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light SourcesG152 Practice for Operating Open Flame Carbon Arc Light Apparatu
8、s for Exposure of Nonmetallic MaterialsG154 Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic MaterialsG155 Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials2.2 ISO Standard:ISO 11431 Building ConstructionSealants: Determination o
9、f Adhesion/Cohesion Properties After Exposure to Heat andArtificial Light Through Glass and to Moisture33. Terminology3.1 DefinitionsDefinitions of the following terms are found in Terminology C717: compound, cure, sealant, substrate.Definitions of the following terms are found in Terminology G113:
10、actinic radiation, control material, file specimen, fluorescentultraviolet lamps, irradiance, open flame carbon arc, radiant exposure, sample, solar radiation-ultraviolet, solar radiation-visible,spectral power distribution, xenon arc.4. Summary of Practice4.1 The test sealant may be applied to a va
11、riety of types of substrates or tested as a free film. The configuration depends on theproperties to be evaluated following exposure. At least four replicates of each sealant being tested are required. After curing, onereplicate of each sealant being tested is retained as an unexposed file specimen
12、and three replicates are exposed to actinic radiation,1This practice is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on Weathering.Current edition approved Jan.April 1, 2006.2011. Published February 2006.April 201
13、1. Originally approved in 1999. Last previous edition approved in 20032006 asC1442 036. DOI: 10.1520/C1442-06.10.1520/C1442-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume informatio
14、n, refer to the standards Document Summary page on the ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.1This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what ch
15、anges have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the off
16、icial document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.heat, and moisture. At the end of the exposure period, the test sealant is examined for property change in comparison with theunexposed file specimen and the performance i
17、s compared with that of an exposed control material, if used.4.2 It is recommended that a similar material of known performance under use conditions (a control) be exposed simultaneouslywith the test specimen for evaluation of the performance of the test materials relative to that of the control und
18、er the samelaboratory exposure conditions. It is preferable to use two control materials, one with relatively poor durability and the other withgood durability.5. Significance and Use5.1 This practice determines the effects of actinic radiation, elevated temperature, and moisture on sealants and the
19、ir constituentsunder controlled laboratory artificial weather test conditions.5.2 When conducting exposures in devices which use laboratory light sources, it is important to consider (1) how well theartificial test conditions will reproduce property changes and failure modes caused by end-use enviro
20、nments on the sealant beingtested and (2) the stability ranking of sealants. Refer to Practice G151 for full cautionary guidance regarding laboratory weathering.5.3 Because of differences in the spectral power distributions of the exposure sources (xenon arc, fluorescent UV lamps, andopen flame carb
21、on arc), as well as other conditions used in the three types of laboratory weathering tests, including temperature,type and amount of moisture, and test cycles, these three procedures may not result in the same performance ranking or types offailure modes of sealants. Further, different exposure dur
22、ations may be required for testing the weathering performance of sealantsby the three types of exposures. Comparisons should not be made of the relative stability of sealants exposed in the different typesof apparatus.5.4 Variations in results may be expected when operating conditions are varied wit
23、hin the accepted limits of this practice.Therefore, all test results using this practice must be accompanied by a report of the specific operating conditions as required inSection 10. Refer to Practice G151 for detailed information on the caveats applicable to use of results obtained according to th
24、ispractice.5.5 No laboratory exposure test can be specified as a total simulation of actual use conditions in outdoor environments. Therelative durability of materials in actual use conditions can vary in different locations because of differences in UV radiation, timeof wetness, relative humidity,
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