ASTM_C_1501_-_19.pdf

Designation:C150119Standard Test Method forColor Stability of Building Construction Sealants asDetermined by Laboratory Accelerated WeatheringProcedures1This standard is issued under the fixed designation C1501;the number immediately following the designation indicates the year oforiginal adoption or,in the case of 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.1.Scope1.1 This test method describes laboratory acceleratedweathering procedures using either fluorescent ultraviolet orxenon arc test devices for determining the color stability ofbuilding construction sealants.1.2 Color stability rankings provided by these two proce-dures may not agree.1.3 The values stated in SI units are to be regarded as thestandard.Values given in parentheses are for information only.1.4 There is no equivalent ISO standard for this test method.1.5 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and SealantsC1442 Practice for Conducting Tests on Sealants UsingArtificial Weathering ApparatusD1729 Practice for Visual Appraisal of Colors and ColorDifferences of Diffusely-Illuminated Opaque MaterialsD2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesE284 Terminology of AppearanceE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE1164 Practice for Obtaining Spectrometric Data for Object-Color EvaluationG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG154 Practice for Operating Fluorescent Ultraviolet(UV)Lamp Apparatus for Exposure of Nonmetallic MaterialsG155 Practice for Operating Xenon Arc Light Apparatus forExposure of Non-Metallic Materials2.2 CIE Documents:CIE Publication Number 85:1989,Technical Report-SolarSpectral Irradiance33.Terminology3.1 DefinitionsDefinitions of the following terms arefound in Terminology C717:standard conditions,compound,cure,sealant,and substrate.Definitions of the following termsare found in Terminology G113:sample,file specimen,control,fluorescent ultraviolet lamp,xenon arc,irradiance,radiantexposure,spectral power distribution.4.Summary of Test Method4.1 Specimens for this procedure are prepared in which thesealant to be tested adheres to flat aluminum panels.While anysurface can be specified and used,this test method wasdeveloped with aluminum panels.At least four replicates ofeach sealant being tested are required.After curing,onereplicate of each sealant being tested is retained as a filespecimen and at least three replicates are exposed to actinicradiation,heat and moisture.At the end of the exposure period,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 May 1,2019.Published May 2019.Originallyapproved in 2001.Last previous edition approved in 2014 as C150114.DOI:10.1520/C1501-19.2For 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.3CIE Central Bureau,Vienna,Kegelgasse 27,A-1030 Wien,AustriaCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 the test sealant is examined for color change by comparison tothe unexposed file specimen.4.2 As recommended in Practice G151 Section 4.2,unlessseveral test sealants are exposed to determine their relativecolor stabilities,one or two control sealants of similar compo-sition and construction to the test specimen and having knowncolor stability should be exposed simultaneously w