ASTM D6075-2000(2010) 1250 Standard Test Method for Cracking Resistance of Leather《皮革耐裂性的标准试验方法》.pdf
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1、Designation: D6075 00 (Reapproved 2010)Standard Test Method forCracking Resistance of Leather1This standard is issued under the fixed designation D6075; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A n
2、umber 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 Department of Defense.1. Scope1.1 This test method covers the determination of the resis-
3、tance of leather to cracking when the leather is bent or foldedwith the grain (or finish) surface on the outside of the bend.Heavy leathers (for example, harness, belt, strap, bag, case, andso forth) are usually bent around a mandrel using eithermechanical resistance (for example, clamp, vise, and s
4、o forth)or by hand. Lighter leathers (for example, shoe upper, uphol-stery, garment, glove, and so forth) are usually given a sharpdouble-fold (crosswise) bend after cooling to a low tempera-ture. This test method does not apply to wet blue.1.2 The values stated in SI units are to be regarded as the
5、standard. The values given in parentheses are for informationonly.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 and health practices and determine the app
6、lica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D1517 Terminology Relating to LeatherD1610 Practice for Conditioning Leather and Leather Prod-ucts for Testing3. Terminology3.1 For definitions of general leather terms used in this testmethod, refer to Ter
7、minology D1517.3.2 Definitions:3.2.1 finish crackingthe appearance of cracks (that is,ruptures) in the finish of leather which may extend through thefinish layer to the surface of the crust leather or deeper.3.2.2 grain crackingthe appearance of cracks (that is,ruptures of the grain enamel) on the g
8、rain surface of the leatherwhich may even extend deeper into the leather cross section.4. Summary of Test Method4.1 A specimen of leather is conditioned and then bent byone of three procedures. The grain (or finish) surface of thebent specimen is then examined for the appearance of anycracks or rupt
9、ures in the area around the bend.4.1.1 One bending procedure for heavier leathers involves amandrel rod, a metal bar with thickness equal to the diameterof the mandrel, and a large clamp or vise to force and hold theleather in the bent configuration around the mandrel with themetal bar placed betwee
10、n the flesh surfaces of the bent leather.4.1.2 A second bending procedure for heavier leathersinvolves bending the leather around a mandrel by hand andforcing and holding the leather so the flesh surfaces of the bentleather are in contact.4.1.3 A third bending procedure for lighter leathers involves
11、cooling the leather specimen and then creating a sharp double(crosswise) fold while the specimen remains in the coldchamber.5. Significance and Use5.1 This test method is designed to determine the crackingresistance of the grain or finish surface of leather on a pass/failbasis. This test method atte
12、mpts to replicate the conditions thatmay be encountered by leather that is bent around a buckleframe or other anchoring device, folded over in seams or welts,and so forth. The cracking resistance of leather is influenced bymany factors such as quantity, location, and type of fatliquor-ing materials;
13、 moisture content; thickness; the presence ofdefects or scar tissue, or both; the presence of processingdamages to the skin or hide tissue; finish system formulation,and so forth. This test method is useful for manufacturingcontrol in the tannery, specification acceptance, and qualitycontrol in the
14、end product manufacturing plant.1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. Thistest method is a combination of three methods (that is, Methods 4011, 4021,and 7211) that were part of Federal
15、 Test Method Standard No. 311. This test methodwas developed in cooperation with the U.S. Defense Personnel Support Center,Directorate of Clothing and Textiles, Philadelphia, PA and the U.S. Army NatickResearch, Development and Engineering Center Natick, MA.Current edition approved April 1, 2010. Pu
16、blished May 2010. Originallyapproved in 1997. Last previous edition approved in 2005 as D6075 00 (2005).DOI: 10.1520/D6075-00R10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informati
17、on, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Apparatus6.1 Vise or Clamp, shall have plain (that is, smooth and notknurled or roughened) jaws not less than 7 cm
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