ASTM_D_3771_-_15_2022.pdf

Designation:D377115(Reapproved 2022)Standard Specification forRubber Seals Used in Concentrating Solar Collectors1This standard is issued under the fixed designation D3771;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 specification covers the general requirements formaterials used in rubber seals of concentrating solar collectors.Particular applications may necessitate other requirements thatwould take precedence over these requirements when speci-fied.1.2 Design requirement pertains only to permissible deflec-tions of the rubber during thermal expansion or contraction ofthe seal in use and the tolerances in dimensions of molded andextruded seals.1.3 This specification does not include requirements per-taining to the fabrication or installation of the seals.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 The following safety hazards caveat pertains only to thetest methods portion,Section 9,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety,health,andenvironmental practices and determine the applicability ofregulatory 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:2C661 Test Method for Indentation Hardness of Elastomeric-Type Sealants by Means of a DurometerC717 Terminology of Building Seals and SealantsC719 Test Method for Adhesion and Cohesion of Elasto-meric Joint Sealants Under Cyclic Movement(HockmanCycle)D395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD865 Test Method for RubberDeterioration by Heating inAir(Test Tube Enclosure)D1149 Test Methods for Rubber DeteriorationCracking inan Ozone Controlled EnvironmentD1229 Test Method for Rubber PropertyCompression Setat Low TemperaturesD1349 Practice for RubberStandard Conditions for Test-ingD1415 Test Method for Rubber PropertyInternationalHardnessD1566 Terminology Relating to RubberD2137 Test Methods for Rubber PropertyBrittleness Pointof Flexible Polymers and Coated FabricsD2240 Test Method for Rubber PropertyDurometer Hard-nessD3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD3183 Practice for RubberPreparation of Pieces for TestPurposes from ProductsG7 Practice for Natural Weathering of MaterialsG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG155 Practice for Operating XenonArc LampApparatus forExposure of Materials2.2 Other Standards:RMA Handbook Rubber Products:Molded,Extruded,Lathe Cut,and Cellular33.Terminology3.1 Refer to the definitions of terms in Terminology C717and Terminology D1566.1This specification is under the jurisdiction ofASTM Committee D11 on Rubberand Rubber-like Materials and is the direct responsibility of Subcommittee D11.37on Coated Fabrics,Rubber Threads and Seals.Current edition approved Oct.1,2022.Published November 2022.Originallyapproved in 1979.Last previous edition approved in 2015 as D3771 15.DOI:10.1520/D3771-15R22.2For 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 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.14.Classification4.1 Types:4.1.1 Type C,intended for use in cold climates(be-low 10C in winter).4.1.2 TypeW,intendedforuseinwarmclimates(above 10C in winter).4.2 Grades4.2.1 Grade designations represent differing degrees ofhardness in accordance with Test Methods D1415 and D2240as follows:4.2.1.1 Grade 2,hardness of 20 6 5.4.2.1.2 Grade 3,hardness of 30 6 5.4.2.1.3 Grade 4,hardness of 40 6 5.4.2.1.4 Grade 5,hardness of 50 6 5.4.2.1.5 Gra