ASTM_D_2813_-_03_2021.pdf

Designation:D281303(Reapproved 2021)Standard Practice forSampling Leather for Physical and Chemical Tests1This standard is issued under the fixed designation D2813;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This practice covers the sampling of finished leather andfabricated leather items for physical and chemical tests.Theproduct is grouped into lots that are randomly sampled in sucha manner as to produce a representative sample of the lot.Thissample may be used to determine compliance of the lot withapplicable specification requirements,and on the basis ofresults,the lot may be accepted or rejected in its entirety.1.2 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 establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.3 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:2D1610 Practice for Conditioning Leather and Leather Prod-ucts for Testing3.Terminology3.1 Definitions:3.1.1 lot(or batch)units of products from a single type,grade,class,size,and composition,manufactured under essen-tially the same conditions and time.3.1.2 Leather in formed lots should be produced from:(1)Units of product of similar size and type.(2)Tanning and finishing material obtained from the sameproducer(functionally equivalent).(3)A single product method.(4)Sequential production batches.3.1.3 unita piece of leather in the form in which it ispurchased,such as a single hide,skin,or any part thereof,or asingle fabricated-leather article in the form in which it ispurchased,such as a counter,pair of shoes,a gasket,etc.4.Significance and Use4.1 The sampling procedures described in this practice havebeen designed to ensure random sampling of finished leatherand fabricated leather items for physical and chemical tests.Leather is a natural product and as such is subject to extensivevariability.The physical and chemical properties vary consid-erably depending on location on the hide,side or skin fromwhich the test sample is taken.Random sampling of specimensfrom a predefined location and orientation minimizes test biasand variability.This practice defines these parameters.5.Conditioning5.1 Physical tests of leather and leather products,unlessotherwise specified in the applicable test method,specification,or procurement document,shall be performed under standardatmospheric conditions as described in Practice D1610,whichis 50 6 4%relative humidity at a temperature of 23 6 1 C(73.4 6 2 F).6.Procedure6.1 Prior to sampling,identify the product properly as a lotor batch.6.2 Select units from locations scattered throughout the lot,not from the same portion of the lot,such as a single carton,layer,etc.Take without regard to quality.6.2.1 The number of samples taken depends on the reliabil-ity of the test results,the deviation of the properties,and theerror of the testing procedure.The number of samples takenmay be at the discretion of the user and the related test methodand should also be recorded on the test report.6.3 Location and Size of Cuttings:1This practice is under the jurisdiction ofASTM Committee D31 on Leather andis the direct responsibility of Subcommittee D31.07 on Physical Properties.Thispractice was developed in cooperation with the American Leather Chemists Assn.(Standard Method J 1 1956).Current edition approved Sept.1,2021.Published October 2021.Originallyapproved in 1984.Last previous edition approved in 2013 as D2813 08(2013).DOI:10.1520/D2813-03R21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.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.16.3.1 SkinsCut the test piece to the size and shape requiredfor the tests to be made,with one edge parallel to