ASTM D6075-13(2020)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6075 − 13 (Reapproved 2020)
Standard Test Method for
Cracking Resistance of Leather
This standard is issued under the fixed designation D6075; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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. Scope D1610 Practice for Conditioning Leather and Leather Prod-
ucts for Testing
1.1 This test method covers the determination of the resis-
D1813 Test Method for Measuring Thickness of Leather
tance of leather to cracking when the leather is bent or folded
Test Specimens
with the grain (or finish) surface on the outside of the bend.
Heavyleathers(forexample,harness,belt,strap,bag,case,and
3. Terminology
so forth) are usually bent around a mandrel using either
3.1 For definitions of general leather terms used in this test
mechanical resistance (for example, clamp, vise, and so forth)
method, refer to Terminology D1517.
or by hand. Lighter leathers (for example, shoe upper,
upholstery, garment, glove, and so forth) are usually given a
3.2 Definitions:
sharp double-fold (crosswise) bend after cooling to a low
3.2.1 finish cracking—the appearance of cracks (that is,
temperature. This test method does not apply to wet blue.
ruptures) in the finish of leather which may extend through the
finish layer to the surface of the crust leather or deeper.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information 3.2.2 grain cracking—the appearance of cracks (that is,
only.
ruptures of the grain enamel) on the grain surface of the leather
which may even extend deeper into the leather cross section.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 A specimen of leather is conditioned and then bent by
priate safety, health, and environmental practices and deter-
one of three procedures. The grain (or finish) surface of the
mine the applicability of regulatory limitations prior to use.
bent specimen is then examined for the appearance of any
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard- cracks or ruptures in the area around the bend.
4.1.1 One bending procedure for heavier leathers involves a
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- mandrel rod, a metal bar with thickness equal to the diameter
of the mandrel, and a large clamp or vise to force and hold the
mendations issued by the World Trade Organization Technical
leather in the bent configuration around the mandrel with the
Barriers to Trade (TBT) Committee.
metal bar placed between the flesh surfaces of the bent leather.
2. Referenced Documents
4.1.2 A second bending procedure for heavier leathers
involves bending the leather around a mandrel by hand and
2.1 ASTM Standards:
forcing and holding the leather so the flesh surfaces of the bent
D1517 Terminology Relating to Leather
leather are in contact.
4.1.3 Athird bending procedure for lighter leathers involves
This test method is under the jurisdiction ofASTM Committee D31 on Leather
cooling the leather specimen and then creating a sharp double
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This
(crosswise) fold while the specimen remains in the cold
test method is a combination of three methods (that is, Methods 4011, 4021,
chamber.
and 7211) that were part of FederalTest Method Standard No. 311.This test method
was developed in cooperation with the U.S. Defense Personnel Support Center,
5. Significance and Use
Directorate of Clothing and Textiles, Philadelphia, PA and the U.S. Army Natick
Research, Development and Engineering Center Natick, MA.
5.1 This test method is designed to determine the cracking
Current edition approved Dec. 1, 2020. Published December 2020. Originally
resistance of the grain or finish surface of leather on a pass/fail
approved in 1997. Last previous edition approved in 2013 as D6075 – 00 (2013).
DOI: 10.1520/D6075-13R20.
basis. This test method attempts to replicate the conditions that
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
may be encountered by leather that is bent around a buckle
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
frame or other anchoring device, folded over in seams or welts,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. and so forth.The cracking resistance of leather is influenced by
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D6075 − 13 (2020)
many factors such as quantity, location, and type of fatliquor-
ing materials; moisture content; thickness; the presence of
defects or scar tissue, or both; the presence of processing
damages to the skin or hide tissue; finish system formulation,
and
...