1、Designation:B41397a(Reapproved 2017)Standard Specification forRefined Silver1This standard is issued under the fixed designation B413;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 i
2、ndicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers refined silver cast bar2form inthree grades as follows:1.1.1 Grade 99.90(UNS P07020)Silver having a mini-mum fineness of 999.0 commonly
3、referred to as“commercialbar”or“bullion.”1.1.2 Grade 99.95(UNS P07015)Silver having a mini-mum fineness of 999.5.1.1.3 Grade 99.99(UNS P07010)A premium grade hav-ing a minimum fineness of 999.9.1.2 The values stated in inch-pound units are to be regardedas standard.1.3 This standard does not purport
4、 to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to become familiarwith all hazards,including those identified in the appropriateSafety Data Sheet(SDS)for this product/material as providedby the manufacturer,to establish approp
5、riate safety and healthpractices,and determine the applicability of regulatory limi-tations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of Interna
6、tional Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE378 Test Method for Spectrographic
7、 Analysis of Silver bythe Powder Technique(Withdrawn 2004)43.Materials and Manufacture3.1 The silver shall be produced by any process that yieldsa product capable of meeting the requirements of this specifi-cation.3.2 The bars shall be of a quality generally acceptable to thetrade.3.3 The manufactur
8、er shall use care to have each shipmentof as uniform quality as possible.4.Chemical Composition4.1 The refined silver shall conform to the chemical com-position prescribed in Table 1.5.Lots5.1 A single melt shall constitute a lot for sampling.6.Method of Analysis6.1 The composition of the bars or sa
9、mples shall be deter-mined by any destructive or nondestructive method agreedupon between the manufacturer and the purchaser.Unlessotherwise specifically agreed,chemical methods will be usedfor analysis.The chemical composition of the materials setforth in this specification shall be determined,in c
10、ase ofdisagreement,in accordance with Test Method E378.Theselection of methods for the determination of elements notcovered by that test method shall be a matter of agreementbetween the manufacturer and the purchaser.7.Sampling7.1 The value of this material is such that special attentionmust be paid
11、 to sampling procedures.If the purchaser and themanufacturer agree that samples most representative of theassay value of a melt are required,the samples should be takenfrom the silver melt as it is ready for pouring into molds.Thesamples should consist of shot or cast pins.1This specification is und
12、er the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.05 on Precious Metals and Electrical Contact Materials.Current edition approved April 1,2017.Published April 2017.Originallyapproved in 1964.Last previous edition approved in
13、2012 as B413 97a(2012).DOI:10.1520/B0413-97AR17.2Other forms of unfabricated silver of commerce are not to be excluded underthis specification.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume
14、 information,refer to the standards Document Summary page onthe ASTM website.4The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was
15、 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.1 7.2 On agreemen
16、t between manufacturer and purchaser,analternative sampling procedure may be used.7.3 The amount of sample taken shall be sufficient to supplythree portions for analysis;the mass of each portion shall besufficient to permit the determination of its composition as setforth in Table 1.7.4 After mixing thoroughly,the sample shall be dividedinto three parts,each placed in a package and sealed,one forthe manufacturer,one for the purchaser,and one for theumpire.8.Product Marking8.1 A brand shall be ca