ASTM D6075-13

Standard Test Method for Cracking Resistance of Leather

SIGNIFICANCE AND USE
5.1 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.

General Information

• Status: Historical
• Publication Date: 30-Apr-2013
• ICS: 59.140.30 - Leather and furs
• Technical Committee: D31 - Leather
• Drafting Committee: D31.01 - Vegetable Leather

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D6075 − 13
Standard Test Method for
1
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 3. Terminology
3.1 For definitions of general leather terms used in this test
1.1 This test method covers the determination of the resis-
method, refer to Terminology D1517.
tance of leather to cracking when the leather is bent or folded
with the grain (or finish) surface on the outside of the bend.
3.2 Definitions:
Heavyleathers(forexample,harness,belt,strap,bag,case,and
3.2.1 finish cracking—the appearance of cracks (that is,
so forth) are usually bent around a mandrel using either
ruptures) in the finish of leather which may extend through the
mechanical resistance (for example, clamp, vise, and so forth)
finish layer to the surface of the crust leather or deeper.
or by hand. Lighter leathers (for example, shoe upper,
3.2.2 grain cracking—the appearance of cracks (that is,
upholstery, garment, glove, and so forth) are usually given a
ruptures of the grain enamel) on the grain surface of the leather
sharp double-fold (crosswise) bend after cooling to a low
which may even extend deeper into the leather cross section.
temperature. This test method does not apply to wet blue.
4. Summary of Test Method
1.2 The values stated in SI units are to be regarded as the
4.1 A specimen of leather is conditioned and then bent by
standard. The values given in parentheses are for information
one of three procedures. The grain (or finish) surface of the
only.
bent specimen is then examined for the appearance of any
1.3 This standard does not purport to address all of the
cracks or ruptures in the area around the bend.
safety concerns, if any, associated with its use. It is the
4.1.1 One bending procedure for heavier leathers involves a
responsibility of the user of this standard to establish appro-
mandrel rod, a metal bar with thickness equal to the diameter
priate safety and health practices and determine the applica-
of the mandrel, and a large clamp or vise to force and hold the
bility of regulatory limitations prior to use.
leather in the bent configuration around the mandrel with the
metal bar placed between the flesh surfaces of the bent leather.
2. Referenced Documents
4.1.2 A second bending procedure for heavier leathers
2 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.
D1610 Practice for Conditioning Leather and Leather Prod-
4.1.3 Athird bending procedure for lighter leathers involves
ucts for Testing
cooling the leather specimen and then creating a sharp double
D1813 Test Method for Measuring Thickness of Leather
(crosswise) fold while the specimen remains in the cold
Test Specimens
chamber.
5. Significance and Use
1
This test method is under the jurisdiction ofASTM Committee D31 on Leather
5.1 This test method is designed to determine the cracking
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This
resistance of the grain or finish surface of leather on a pass/fail
test method is a combination of three methods (that is, Methods 4011, 4021,
basis. This test method attempts to replicate the conditions that
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,
may be encountered by leather that is bent around a buckle
Directorate of Clothing and Textiles, Philadelphia, PA and the U.S. Army Natick
frame or other anchoring device, folded over in seams or welts,
Research, Development and Engineering Center Natick, MA.
and so forth.The cracking resistance of leather is influenced by
Current edition approved May 1, 2013. Published May 2013. Originally
many factors such as quantity, location, and type of fatliquor-
approved in 1997. Last previous edition approved in 2010 as D6075 – 00 (2010).
DOI: 10.1520/D6075-13.
ing materials; moisture content; thickness; the presence of
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
defects or scar tissue, or both; the presence of processing
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
damages to the skin or hide tissue; finish system formulation,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. and so forth. This te
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6075 − 00 (Reapproved 2010) D6075 − 13
Standard Test Method for
1
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
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1517 Terminology Relating to Leather
D1610 Practice for Conditioning Leather and Leather Products for Testing
D1813 Test Method for Measuring Thickness of Leather Test Specimens
3. Terminology
3.1 For definitions of general leather terms used in this test method, refer to Terminology D1517.
3.2 Definitions:
3.2.1 finish cracking—the appearance of cracks (that is, ruptures) in the finish of leather which may extend through the finish
layer to the surface of the crust leather or deeper.
3.2.2 grain cracking—the appearance of cracks (that is, ruptures of the grain enamel) on the grain surface of the leather which
may even extend deeper into the leather cross section.
4. Summary of Test Method
4.1 A specimen of leather is conditioned and then bent by one of three procedures. The grain (or finish) surface of the bent
specimen is then examined for the appearance of any cracks or ruptures in the area around the bend.
4.1.1 One bending procedure for heavier leathers involves a 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 leather in the bent configuration around the mandrel with the metal
bar placed between the flesh surfaces of the bent leather.
4.1.2 A second bending procedure for heavier leathers involves bending the leather around a mandrel by hand and forcing and
holding the leather so the flesh surfaces of the bent leather are in contact.
1
This test method is under the jurisdiction of ASTM Committee D31 on Leather and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This test
method is a combination of three methods (that is, Methods 4011, 4021, and 7211) that were part of Federal Test Method Standard No. 311. This test method was developed
in cooperation with the U.S. Defense Personnel Support Center, Directorate of Clothing and Textiles, Philadelphia, PA and the U.S. Army Natick Research, Development and
Engineering Center Natick, MA.
Current edition approved April 1, 2010May 1, 2013. Published May 2010May 2013. Originally approved in 1997. Last previous edition approved in 20052010 as
D6075 – 00 (2005).(2010). DOI: 10.1520/D6075-00R10.10.1520/D6075-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D6075 − 13
4.1.3 A third bending procedure for lighter leathers involves cooling the leather specimen and then creating a sharp double
(crosswise) fold while the specimen remains in the cold chamber.
5. Significance and Use
5.1 This test method is designed to determine the cracking resistance of the grain or finish surface
...