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Designation: B413 − 97a (Reapproved 2017)Standard Specif i cation forRef i ned Silver 1This standard is issued under the f i xed 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 indicates the year of last reapproval. Asuperscript epsilon (´) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specif i cation covers ref i ned silver cast bar 2 form inthree grades as follows:1.1.1 Grade 99.90 (UNS P07020)—Silver having a mini-mum f i neness of 999.0 commonly referred to as “commercialbar” or “bullion.”1.1.2 Grade 99.95 (UNS P07015)—Silver having a mini-mum f i neness of 999.5.1.1.3 Grade 99.99 (UNS P07010)—A premium grade hav-ing a minimum f i neness of 999.9.1.2 The values stated in inch-pound units are to be regardedas standard.1.3 This standard does not purport 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 identif i ed in the appropriateSafety Data Sheet (SDS) for this product/material as providedby the manufacturer, to establish appropriate 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 International 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 Signif i cant Digits in Test Data toDetermine Conformance with Specif i cationsE378 Test Method for Spectrographic Analysis of Silver bythe Powder Technique (Withdrawn 2004) 43.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 specif i -cation.3.2 The bars shall be of a quality generally acceptable to thetrade.3.3 The manufacturer shall use care to have each shipmentof as uniform quality as possible.4. Chemical Composition4.1 The ref i ned 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 samples shall be deter-mined by any destructive or nondestructive method agreedupon between the manufacturer and the purchaser. Unlessotherwise specif i cally agreed, chemical methods will be usedfor analysis. The chemical composition of the materials setforth in this specif i cation shall be determined, in case 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 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.1 This specif i cation is under 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 2012 as B413 – 97a (2012).DOI: 10.1520/B0413-97AR17.2 Other forms of unfabricated silver of commerce are not to be excluded underthis specif i cation.3 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service@astm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.4 The 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 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