1、Designation: D4704 13 (Reapproved 2017)Standard Test Method forTearing Strength, Tongue Tear of Leather1This standard is issued under the fixed designation D4704; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last rev
2、ision. 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 is intended for determi
3、ning the tearingstrength of leather by measuring the force required to tear aspecimen cut perpendicular to the surface. This test methoddoes 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 S
4、I 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 pra
5、ctices 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 a
6、nd 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 Metho
7、d for Tensile Strength of LeatherD2813 Practice for Sampling Leather for Physical andChemical Tests3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 tongue tear strengththe load required to tear theleather between two tongues formed by splitting the leatherperpendicular to its s
8、urface.4. Significance and Use4.1 Knowledge of the strength of the sample can be adetermining factor for the end use of the product.5. Apparatus5.1 Testing Machine, as described in Test Method D2209.5.2 Thickness Gage, a dead weight type of thickness gage asdescribed in Test Method D1813.5.3 Steel D
9、ie, to cut test specimens.6. Sampling and Test Specimens6.1 Unless otherwise specified, sample the leather accordingto Practice D2813.6.2 The specimen shall be a rectangular piece of leather,1 4 in. (25.4 101.6 mm) by the full thickness of the unit. Itshall have a316 in. (4.76 mm) hole located on th
10、e long axis 1in. (25.4 mm) from one end and shall be split along its axisfrom the hole to the other end to form two tongues. Thedirection of the long axis of the specimen relative to thebackbone shall be noted. See Fig. 1.7. Conditioning7.1 All specimens shall be conditioned and tested in anatmosphe
11、re as described in Practice D1610.8. Procedure8.1 Determine the thickness of the specimen to the nearest0.001 in. (0.01 mm) on the long axis between the hole and theunsplit end of the specimen. The gage foot shall be adjacent to,but shall not overlap, the hole.8.2 Clamp one of the tongues on the spe
12、cimen in each of thetesting grips so that the long axis of the tongue is in thedirection of the motion of the movable grip. The faces of thegrips shall be approximately 2 in. (50.8 mm) from the commonbase of the tongues (from the hole).1This test method is under the jurisdiction of ASTM Committee D3
13、1 on Leatherand is the direct responsibility of Subcommittee D31.07 on Physical PropertiesCurrent edition approved Sept. 1, 2017. Published October 2017. Originallyapproved in 1987. Last previous edition approved in 2013 as D4704 13. DOI:10.1520/D4704-13R17.2For referenced ASTM standards, visit the
14、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.This international standard was developed in accordance with internationally recognized principles on s
15、tandardization 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.18.3 Operate the machine at 10 6 2 in. (254 6 50.8 mm) perminute until the specimen st
16、arts to tear. At the instant of theinitial tear, note and record the load registered by the machine.9. Report9.1 The thickness measurement of all specimens tested shallbe averaged to the nearest 0.001 in. (0.01 mm) and reported asthe thickness of the sample.9.2 The load required to tear the specimen
17、s shall be aver-aged to the nearest pound and reported as the tongue tearstrength of the sample.9.3 The direction of the long axis of the specimen relative tothe backbone shall be reported.10. Precision and Bias (or Reproducibility)10.1 This test method is adopted from the procedures of theAmerican
18、Leather ChemistsAssociation where it has long beenin use and where it was approved for publication before theinclusion of precision and bias statements was mandated. Theoriginal inter-laboratory test data is no longer available. Theuser is cautioned to verify by the use of reference materials, ifava
19、ilable, that the precision and bias (or reproducibility) of thistest method is adequate for the contemplated use.11. Keywords11.1 leather; tear strength; tearing strength; tongue tear;tongue tear strength; strengthASTM International takes no position respecting the validity of any patent rights asse
20、rted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by
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22、ve careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM Inter
23、national, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Test SpecimenD4704 13 (2017)2
