1、Designation:D281303(Reapproved 2013)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 revi
2、sion.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 l
3、eather 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
4、 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 and health practices and determine the app
5、lica-bility of regulatory limitations prior to use.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 und
6、er 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 u
7、nita 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
8、 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 s
9、kin 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 me
10、thod,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 1C(73.4 6 2F).6.Procedure6.1 Prior to sampling,identify the product properly as a lotor batch.6.2 Select units f
11、rom 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
12、 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:6.3.1 SkinsCut the test piece to the size and shape requiredfor the tests to be made,with one edge parallel to and 1 in.(25.4 mm)fr
13、om the backbone line,beginning 3 in.(76 mm)from the root of the tail.Pieces shall be cut from only one sideof the backbone of each skin.The test area for skins corre-sponds to area a for cattlehides of Fig.1.6.3.2 CattlehidesThe location and size of cutting shall beas follows:1This practice is under
14、 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 May 1,2013.Published July 2013.Origina
15、lly approvedin 1984.Last previous edition approved in 2008 as D2813 08.DOI:10.1520/D2813-03R13.2For 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 Sum
16、mary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.3.2.1 Hides,Sides,Crops,Backs,and BendsCut the testpiece to the size and shape required for the test to be made,with one edge parallel to and 2 in.(51 mm)from the backboneline beginning 5 in.(127 mm)from the root of the tail.In mostinstances,test piece a may be cut 8 in.(203 mm)by 8 in.(203mm).Sample double bends,belting butts,and hides on onlyone side of t
