1、Designation: D 2212 00 (Reapproved 2005)Standard Test Method forSlit Tear Resistance of Leather1This standard is issued under the fixed designation D 2212; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method covers the determination of the sl
3、it 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 the standard. These values given in parentheses are forinformation only.1.3 This standard does not purport to add
4、ress 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 applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 1610 Practi
5、ce for Conditioning Leather and LeatherProducts for TestingD 1813 Test Method for Measuring Thickness of LeatherTest SpecimensD 2209 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 leathe
6、r 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-
7、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 affec
8、t 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 D 2209.5.2 Thickness GageA dead-weight type of thickness gageas described in
9、Test Method D 1813.5.3 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
10、 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
11、slit tear die shall have a slot716 in. (0.4375 in. (11 mm) long by316 in. (0.1875 in. (4.8mm) wide tapered with a316-in. radius to a slit at each end ofspecimen as shown in Fig. 2.7. Conditioning7.1 All specimens shall be conditioned as prescribed inPractice D 1610. Conditioning other than as prescr
12、ibed shall benoted in the results.8. Procedure8.1 Determine the thickness of the specimen to the nearest0.001 in. (0.025 mm) on the long axis at each end of the cut.The gage foot shall be adjacent to, but shall not overlap, thecut.1This test method is under the jurisdiction of ASTM Committee D31 on
13、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 E 59 1965).Current edition approved April 1, 2005. Published May 2005. Originallyapproved in 1963. Last previous
14、 edition approved in 2000 as D 2212 00.2For 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.1Copyright ASTM Intern
15、ational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8.2 Slip the specimen over the protruding ends of theholders and push it down. The slot cut shall be perpendicular tothe applied force. Run the machine until the specimen is tornapart. Operate at a uniform s
16、peed of 10 6 2 in./min (254 6 50mm/min) when running free. Note the maximum load to tearthe specimen.9. Report9.1 The report shall include the following:9.1.1 Thickness to the nearest 0.001 in. (0.025 mm), re-ported for each specimen or averaged and reported as thethickness of the sample,9.1.2 Load
17、in pounds-force (or newtons) to tear the speci-men to the nearest 1 lbf (4.5 N) reported for each specimen oraveraged and reported as the tear resistance of the sample, and9.1.3 Direction of the long axis of the specimen relative tothe backbone.10. Precision and Bias10.1 The following criteria may b
18、e used to judge theacceptability of the results if at least 15 units have been tested:10.1.1 One Operator, Duplicate Specimens, Same SkinResults by the same operator on duplicate adjacent specimensin a skin taken from the official sampling position should not beconsidered suspect unless the coeffici
19、ent of variation exceeds:Shoe upper 9Garment 12Upholstery 13CalfskinA7A3 6 1oz(856 28 g), 0.0468 6 0.0156 in. (1.189 6 0.396 mm).10.1.2 Two Laboratories, Duplicate Specimens, SameSkinResults for the same group of light leather listed in10.1.1 submitted by each of two laboratories on duplicateadjacen
20、t specimens in a skin taken from the official samplingposition should not be considered suspect unless the twoaverage results differ by more than 5 %.NOTE 1The reproducibility reported in 10.1.2 is based on dataobtained at two laboratories, each with a different type of testing machineand a differen
21、t operator. One machine is a load-cell type and the other apendulum type. The results show close correlation between laboratories.NOTE 2The results given in Section 10 are based on tests on 30 sidesof leather and do not apply to findings and cut parts.NOTE 3The precision data for between skins are n
22、ot given becausethe results were based on different skins of several production lots. Thevariables in leather for between skins will give higher variation of theresults, but this factor should not affect the precision of the method.11. Keywords11.1 leather; slit tear; slot tear; strength; tear; tear
23、 strengthMetric Equivalentsin. mm in. mm in. mm116 1.6 0.266 6.7612 12.70.125 3.27 0.281 7.14 0.812 20.630.187 4.75516 8 1 25.40.197 538 9.5 138 350.219 5.56 0.375 9.53 278 7314 6.4 0.394 10 31116 93FIG. 1 New and Old Style Slit Tear ClampsMetric Equivalentsin.mm3164.81212.758163419125.4251FIG. 2 Sh
24、ape and Dimensions of Die for Cutting Slit Tear TestSpecimensD 2212 00 (2005)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the valid
25、ity 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 the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comme
26、nts are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have n
27、ot 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 International, 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).D 2212 00 (2005)3
