Designation:B413−97a(Reapproved2017)StandardSpecificationforRefinedSilver1ThisstandardisissuedunderthefixeddesignationB413;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversrefinedsilvercastbar2forminthreegradesasfollows:1.1.1Grade99.90(UNSP07020)—Silverhavingamini-mumfinenessof999.0commonlyreferredtoas“commercialbar”or“bullion.”1.1.2Grade99.95(UNSP07015)—Silverhavingamini-mumfinenessof999.5.1.1.3Grade99.99(UNSP07010)—Apremiumgradehav-ingaminimumfinenessof999.9.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtobecomefamiliarwithallhazards,includingthoseidentifiedintheappropriateSafetyDataSheet(SDS)forthisproduct/materialasprovidedbythemanufacturer,toestablishappropriatesafetyandhealthpractices,anddeterminetheapplicabilityofregulatorylimi-tationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:3E29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecificationsE378TestMethodforSpectrographicAnalysisofSilverbythePowderTechnique(Withdrawn2004)43.MaterialsandManufacture3.1Thesilvershallbeproducedbyanyprocessthatyieldsaproductcapableofmeetingtherequirementsofthisspecifi-cation.3.2Thebarsshallbeofaqualitygenerallyacceptabletothetrade.3.3Themanufacturershallusecaretohaveeachshipmentofasuniformqualityaspossible.4.ChemicalComposition4.1Therefinedsilvershallconformtothechemicalcom-position...
