ASTM D6075-00(2005)
(Test Method)Standard Test Method for Cracking Resistance of Leather
Standard Test Method for Cracking Resistance of Leather
SIGNIFICANCE AND USE
This test method is designed to determine the cracking resistance of the grain or finish surface of leather on a pass/fail basis. This test method attempts to replicate the conditions that may be encountered by leather that is bent around a buckle frame or other anchoring device, folded over in seams or welts, and so forth. The cracking resistance of leather is influenced by many factors such as quantity, location, and type of fatliquoring 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 so forth. This test method is useful for manufacturing control in the tannery, specification acceptance, and quality control in the end product manufacturing plant.
SCOPE
1.1 This test method covers the determination of the resistance of leather to cracking when the leather is bent or folded with the grain (or finish) surface on the outside of the bend. Heavy leathers (for example, harness, belt, strap, bag, case, and so forth) are usually bent around a mandrel using either mechanical resistance (for example, clamp, vise, and so forth) or by hand. Lighter leathers (for example, shoe upper, upholstery, garment, glove, and so forth) are usually given a sharp double-fold (crosswise) bend after cooling to a low temperature. This test method does not apply to wet blue.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
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Designation:D6075–00(Reapproved2005)
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 Department of Defense.
1. Scope 3.2 Definitions:
3.2.1 finish cracking—the appearance of cracks (that is,
1.1 This test method covers the determination of the resis-
ruptures) in the finish of leather which may extend through the
tance of leather to cracking when the leather is bent or folded
finish layer to the surface of the crust leather or deeper.
with the grain (or finish) surface on the outside of the bend.
3.2.2 grain cracking—the appearance of cracks (that is,
Heavyleathers(forexample,harness,belt,strap,bag,case,and
ruptures of the grain enamel) on the grain surface of the leather
so forth) are usually bent around a mandrel using either
which may even extend deeper into the leather cross section.
mechanical resistance (for example, clamp, vise, and so forth)
or by hand. Lighter leathers (for example, shoe upper, uphol-
4. Summary of Test Method
stery, garment, glove, and so forth) are usually given a sharp
4.1 A specimen of leather is conditioned and then bent by
double-fold (crosswise) bend after cooling to a low tempera-
one of three procedures. The grain (or finish) surface of the
ture. This test method does not apply to wet blue.
bent specimen is then examined for the appearance of any
1.2 The values stated in SI units are to be regarded as the
cracks or ruptures in the area around the bend.
standard. The values given in parentheses are for information
4.1.1 One bending procedure for heavier leathers involves a
only.
mandrel rod, a metal bar with thickness equal to the diameter
1.3 This standard does not purport to address all of the
of the mandrel, and a large clamp or vise to force and hold the
safety concerns, if any, associated with its use. It is the
leather in the bent configuration around the mandrel with the
responsibility of the user of this standard to establish appro-
metal bar placed between the flesh surfaces of the bent leather.
priate safety and health practices and determine the applica-
4.1.2 A second bending procedure for heavier leathers
bility of regulatory limitations prior to use.
involves bending the leather around a mandrel by hand and
2. Referenced Documents forcing and holding the leather so the flesh surfaces of the bent
2 leather are in contact.
2.1 ASTM Standards:
4.1.3 Athird bending procedure for lighter leathers involves
D1517 Terminology Relating to Leather
cooling the leather specimen and then creating a sharp double
D1610 Practice for Conditioning Leather and Leather Prod-
(crosswise) fold while the specimen remains in the cold
ucts for Testing
chamber.
3. Terminology
5. Significance and Use
3.1 For definitions of general leather terms used in this test
5.1 This test method is designed to determine the cracking
method, refer to Terminology D1517.
resistance of the grain or finish surface of leather on a pass/fail
basis. This test method attempts to replicate the conditions that
This test method is under the jurisdiction ofASTM Committee D31 on Leather
may be encountered by leather that is bent around a buckle
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This
frame or other anchoring device, folded over in seams or welts,
test method is a combination of three methods (that is, Methods 4011, 4021,
and so forth.The cracking resistance of leather is influenced by
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,
many factors such as quantity, location, and type of fatliquor-
Directorate of Clothing and Textiles, Philadelphia, PA and the U.S. Army Natick
ing materials; moisture content; thickness; the presence of
Research, Development and Engineering Center Natick, MA.
defects or scar tissue, or both; the presence of processing
Current edition approved Sept. 1, 2005. Published September 2005. Originally
approved in 1997. Last previous edition approved in 2000 as D6075 – 00. DOI: damages to the skin or hide tissue; finish system formulation,
10.1520/D6075-00R05.
and so forth. This test method is useful for manufacturing
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
control in the tannery, specification acceptance, and quality
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
control in the end product manufacturing plant.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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D6075–00 (2005)
6. Apparatus
6.1 Vise or
...
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