Designation:B613−76(Reapproved2012)StandardGuideforPreparingSpecificationsforMiniatureBrushesofCompositeMaterialsforSlidingElectricContacts1ThisstandardisissuedunderthefixeddesignationB613;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidedefinesthecriteriaforcomposition,properties,andotherrequirementsforbrushescontainingamatrixofoneormoreconductingmetallicelementsoralloysandoneormorelubricatinglamellarsolids.1.2Theresultingspecificationisintendedforusewherethesize(forexample,5by3by2mm),shape,orotherfactorsprecludethedeterminationofpropertiesonspecimensofthebulkmaterialfromwhichindividualbrushesaremade.1.3Therequirementsrecommendedhereinhavebeenfoundtobedesirableformostbrushmaterialcomposites.Caremustbetakeninpreparingaspecificationforapre-existingmaterialthatimpositionofoneormoreprovisionshereindoesnotalterthematerialoritsperformance.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.ItistheresponsibilityoftheuserofthisstandardtobecomefamiliarwithallhazardsincludingthoseidentifiedintheappropriateMaterialSafetyDataSheet(MSDS)forthisproduct/materialasprovidedbythemanufacturer,toestablishappropriatesafetyandhealthpractices,anddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E18TestMethodsforRockwellHardnessofMetallicMa-terialsE384TestMethodforKnoopandVickersHardnessofMaterials2.2ANSIStandard:C64.1BrushesforElectricalMachines33.Requirements3.1Composition—Eachconstituentshouldbelistedindi-viduallybyweightpercentincludingtolerancesifmutuallyagreeduponbyproduceranduser.Anyanalyticaltechniquemaybeusedasagreeduponbetweentheproduceranduser.3.2Density—Anapparent...
