ASTM_D_3832_-_79_2011.pdf

Designation:D383279(Reapproved 2011)Standard Specification forRubber Seals Contacting Liquids in Solar Energy Systems1This standard is issued under the fixed designation D3832;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.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This specification covers the general requirements formaterials used in preformed rubber seals that contact thecirculating liquid in solar energy systems.Particular applica-tions may necessitate other requirements that would takeprecedence over these requirements when specified.1.2 This specification does not include requirements per-taining to the design,fabrication,or installation of the seals.2.Referenced Documents2.1 ASTM Standards:2D395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD1149 Test Methods for Rubber DeteriorationCracking inan Ozone Controlled EnvironmentD1229 Test Method for Rubber PropertyCompression Setat Low TemperaturesD1349 Practice for RubberStandard Temperatures forTestingD1415 Test Method for Rubber PropertyInternationalHardnessD1566 Terminology Relating to RubberD2137 Test Methods for Rubber PropertyBrittleness Pointof Flexible Polymers and Coated FabricsD3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD3183 Practice for RubberPreparation of Pieces for TestPurposes from Products2.2 Other Standards:RMA HandbookRubber Products:Molded,Extruded,Lathe Cut,and Cellular33.Terminology3.1 Refer to the definitions of terms in Terminology D1566.4.Classification4.1 Types:4.1.1 Type C,intended for use in cold climates(below10C in winter).4.1.2 Type W,intended for use in warm climates(above10C in winter).4.2 Grades:4.2.1 Grade designations represent differing degrees ofhardness in accordance with Test Method D1415 as follows:4.2.1.1 Grade 3,hardness of 30 6 5.4.2.1.2 Grade 4,hardness of 40 6 5.4.2.1.3 Grade 5,hardness of 50 6 5.4.2.1.4 Grade 6,hardness of 60 6 5.4.2.1.5 Grade 7,hardness of 70 6 5.4.2.1.6 Grade 8,hardness of 80 6 5.NOTE1The grade to be used in a particular application depends on thedesign of the seal and must be specified by the designer.4.3 Classes:4.3.1 Seals shall be classified as follows:4.3.1.1 Class A,seals for use with aqueous liquids at amaximum service temperature of 100C.4.3.1.2 Class AT,seals for use with aqueous liquids at amaximum service temperature above 100C.4.3.1.3 Class N,seals for use with nonaqueous liquids.NOTE2Aqueous liquids include water and antifreeze solutions.5.Ordering Information5.1 Orders for seals under this specification shall include thefollowing information:5.1.1 ASTM designation and year of issue,5.1.2 Type,grade,and class,1This specification is under the jurisdiction ofASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.37 on Coated Fabrics,RubberThreads and Seals.Current edition approved Nov.1,2011.Published January 2012.Originallyapproved in 1979.Last previous edition approved in 2006 as D3832 79(2006).DOI:10.1520/D3832-79R11.2For 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.3Available from the Rubber Manufacturers Association(RMA),444 MadisonAve.,New York,NY 10022.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.3 Design and dimensions of seal,5.1.4 Contacting liquid,5.1.5 Maximum service temperature,and5.1.6 Quantity.6.Dimensions6.1 The tolerances in dimensions shall conform to thefollowing designations in the RMA Handbook.6.1.1 Molded Seals:6.1.1.1 Commercial DimensionsRMA A3-F3-T.032.6.1.1.2 Critical DimensionsRMA A2-F3-T.032.6.1.2 Extruded Seals:6.1.2.1 Commercial DimensionsRMA A2-F3.7.Workmanship,Finish,and Appearance7.1 Seals shall be free of blisters,checks,cracks,and otherimperfections that can affect their ability to make or maintaina liquid-tight seal.8.Test Methods8.1 Prepare the specimens in accordance with PracticeD3183 and test the specimens in accordance with the testmethods given in 8.2.For control of production,specimensmay be taken from standard test sheets prepared in accordancewith Practice D3182,using the same unvulcanized materialused to prepare the seals and vulcanizing the material at thesame temperature used for the seals to an equivalent state ofvulcanization.8.2 Determine ultimate elongation in accordance with TestMethods D412.Determine other requirements in accordancewith the methods