ASTM_D_2212_-_00_2021.pdf

Designation:D221200(Reapproved 2021)Standard Test Method forSlit Tear Resistance of Leather1This standard is issued under the fixed designation D2212;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 test method covers the determination of the slit tearresistance of light leathers such as shoe uppers,gloves,andupholstery.This test method does not apply to wet blue.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered 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 establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations 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:2D1610 Practice for Conditioning Leather and Leather Prod-ucts for TestingD1813 Test Method for Measuring Thickness of LeatherTest SpecimensD2209 Test Method for Tensile Strength of Leather3.Terminology3.1 Definitions:3.1.1 slit tear resistancethe load required to tear thecross-sectional thickness of the leather at a slit cut through theleather by a die or a sharp knife.4.Significance and Use4.1 This test method is designed to measure the loadrequired to tear leather at a slit cut perpendicular to its surface.Tanners and leather buyers have found that it gives anindication of the resistance of the cross-sectional thickness ofleather to tearing.It is of particular value in estimating thedurability of leather to withstand tearing stresses encounteredin the manufacture of shoes,garments,and upholstered prod-ucts.The thickness of the specimen and direction of slit relativeto the backbone will affect the uniformity of the test results.This test method may not apply when the conditions of the testemployed differ widely from those specified in the test method.5.Apparatus5.1 Testing Machine,as described in Test Method D2209.5.2 Thickness GaugeA dead-weight type of thicknessgauge as described in Test Method D1813.5.3 Specimen HoldersTwo specimen holders,which arefastened into the jaws of the testing machine and which supportthe specimen during testing(see Fig.1).The specimen holdersshall be adjusted in the machine so that they are touching eachother.5.4 DieA die 1 in.(25.4 mm)wide by 2 in.(51 mm)longthat cuts a specimen while simultaneously cutting a slot in thespecimen(see Fig.2).6.Test Specimens6.1 The specimen shall be 1 by 2 in.(25.4 by 51 mm),cutwith the long dimension either parallel or perpendicular to thebackbone(see Figs.1 and 2).6.2 The specimen cut with the slit tear die shall have a slot716in.(0.4375 in.(11 mm)long by316in.(0.1875 in.(4.8mm)wide tapered with a316-in.radius to a slit at each end ofspecimen as shown in Fig.2.1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.07 on Physical Properties Thistest method was developed in cooperation with the American Leather ChemistsAssn.(Standard Method E59 1965).Current edition approved Sept.1,2021.Published October 2021.Originallyapproved in 1963.Last previous edition approved in 2015 as D2212 00(2015).DOI:10.1520/D2212-00R21.2For 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.17.Conditioning7.1 All specimens shall be conditioned as prescribed inPractice D1610.Conditioning other than as prescribed shall benoted in the results.Metric Equivalentsin.mmin.mmin.mm1161.60.2666.761212.70.1253.270.2817.140.81220.630.1874.755168125.40.1975389.5138350.2195.560.3759.5327873146.40.394103111693FIG.1 New and Old Style Slit Tear ClampsMetric Equivalents