Designation:D3771−15(Reapproved2022)StandardSpecificationforRubberSealsUsedinConcentratingSolarCollectors1ThisstandardisissuedunderthefixeddesignationD3771;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversthegeneralrequirementsformaterialsusedinrubbersealsofconcentratingsolarcollectors.Particularapplicationsmaynecessitateotherrequirementsthatwouldtakeprecedenceovertheserequirementswhenspeci-fied.1.2Designrequirementpertainsonlytopermissibledeflec-tionsoftherubberduringthermalexpansionorcontractionofthesealinuseandthetolerancesindimensionsofmoldedandextrudedseals.1.3Thisspecificationdoesnotincluderequirementsper-tainingtothefabricationorinstallationoftheseals.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thefollowingsafetyhazardscaveatpertainsonlytothetestmethodsportion,Section9,ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafety,health,andenvironmentalpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2C661TestMethodforIndentationHardnessofElastomeric-TypeSealantsbyMeansofaDurometerC717TerminologyofBuildingSealsandSealantsC719TestMethodforAdhesionandCohesionofElasto-mericJointSealantsUnderCyclicMovement(HockmanCycle)D395TestMethodsforRubberProperty—CompressionSetD412TestMethodsforVulcanizedRubberandThermo...
