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ASTM

ASTM D6075-00

(Test Method)

Standard Test Method for Cracking Resistance of Leather

Standard Test Method for Cracking Resistance of Leather

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
09-Sep-2000
ICS
59.140.30 - Leather and furs
Technical Committee
D31 - Leather
Drafting Committee
D31.01 - Vegetable Leather
Current Stage
Ref Project

Relations

Replaced By
ASTM D6075-00(2005) - Standard Test Method for Cracking Resistance of Leather
Effective Date
01-Sep-2005

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ASTM D6075-00 - Standard Test Method for Cracking Resistance of LeatherASTM D6075-00 - Standard Test Method for Cracking Resistance of Leather
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ASTM D6075-00 - Standard Test Method for Cracking Resistance of Leather
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D6075–00
Standard Test Method for
Cracking Resistance of Leather
This standard is issued under the fixed designation D 6075; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2.2 grain cracking—the appearance of cracks (that is,
ruptures of the grain enamel) on the grain surface of the leather
1.1 This test method covers the determination of the resis-
which may even extend deeper into the leather cross section.
tance of leather to cracking when the leather is bent or folded
with the grain (or finish) surface on the outside of the bend.
4. Summary of Test Method
Heavyleathers(forexample,harness,belt,strap,bag,case,and
4.1 A specimen of leather is conditioned and then bent by
so forth) are usually bent around a mandrel using either
one of three procedures. The grain (or finish) surface of the
mechanical resistance (for example, clamp, vise, and so forth)
bent specimen is then examined for the appearance of any
or by hand. Lighter leathers (for example, shoe upper, uphol-
cracks or ruptures in the area around the bend.
stery, garment, glove, and so forth) are usually given a sharp
4.1.1 One bending procedure for heavier leathers involves a
double-fold (crosswise) bend after cooling to a low tempera-
mandrel rod, a metal bar with thickness equal to the diameter
ture. This test method does not apply to wet blue.
of the mandrel, and a large clamp or vise to force and hold the
1.2 The values stated in SI units are to be regarded as the
leather in the bent configuration around the mandrel with the
standard. The values given in parentheses are for information
metal bar placed between the flesh surfaces of the bent leather.
only.
4.1.2 A second bending procedure for heavier leathers
1.3 This standard does not purport to address all of the
involves bending the leather around a mandrel by hand and
safety concerns, if any, associated with its use. It is the
forcing and holding the leather so the flesh surfaces of the bent
responsibility of the user of this standard to establish appro-
leather are in contact.
priate safety and health practices and determine the applica-
4.1.3 Athird bending procedure for lighter leathers involves
bility of regulatory limitations prior to use.
cooling the leather specimen and then creating a sharp double
2. Referenced Documents (crosswise) fold while the specimen remains in the cold
chamber.
2.1 ASTM Standards:
D 1517 Terminology Relating to Leather
5. Significance and Use
D 1610 Practice for Conditioning Leather and Leather
5.1 This test method is designed to determine the cracking
Products for Testing
resistance of the grain or finish surface of leather on a pass/fail
D 1813 Test Method for Measuring Thickness of Leather
basis. This test method attempts to replicate the conditions that
Test Specimens
may be encountered by leather that is bent around a buckle
3. Terminology frame or other anchoring device, folded over in seams or welts,
and so forth.The cracking resistance of leather is influenced by
3.1 For definitions of general leather terms used in this test
many factors such as quantity, location, and type of fatliquor-
method, refer to Terminology D 1517.
ing materials; moisture content; thickness; the presence of
3.2 Definitions:
defects or scar tissue, or both; the presence of processing
3.2.1 finish cracking—the appearance of cracks (that is,
damages to the skin or hide tissue; finish system formulation,
ruptures) in the finish of leather which may extend through the
and so forth. This test method is useful for manufacturing
finish layer to the surface of the crust leather or deeper.
control in the tannery, specification acceptance, and quality
control in the end product manufacturing plant.
This test method is under the jurisdiction ofASTM Committee D31 on Leather
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This 6. Apparatus
test method is a combination of three methods (that is, Methods 4011, 4021,
6.1 Vise or Clamp, shall have plain (that is, smooth and not
and 7211) that were part of FederalTest Method Standard No. 311.This test method
knurled or roughened) jaws not less than 7 cm (2 ⁄4 in.) wide.
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
6.2 Mandrel, shall be a rod approximately 15 cm (6 in.) in
Research, Development and Engineering Center Natick, MA.
length and shall have a diameter as specified in the material
Current edition approved Sept. 10, 2000. Published October 2000. Originally
specification.
published as D 6075 - 97. Last previous edition D 6075 – 97.
Annual Book of ASTM Standards, Vol 15.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C7
...

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