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ASTM D4831-00(2020)

(Test Method)

Standard Test Method for Buckle Tear Strength of Leather

Standard Test Method for Buckle Tear Strength of Leather

SIGNIFICANCE AND USE
2.1 This test method is designed to measure the load required to tear a leather strap fastened in a buckle. Tanners and leather buyers have found that this test gives an indication of the resistance of leather to tearing.  
2.2 This test method should be suitable for specification acceptance, design purposes, manufacturing control, development, and research. The thickness of the specimen and direction of tear relative to the backbone will affect the uniformity of the test results. This test method may not apply when the conditions of the test employed differ widely from those specified in this test method.
SCOPE
1.1 This test method is intended for use on all types of leather to determine the load required to tear a leather strap fastened in a buckle. This test method does not apply to wet blue.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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.

General Information

Status
Published
Publication Date
30-Nov-2020
ICS
59.140.30 - Leather and furs
Technical Committee
D31 - Leather
Drafting Committee
D31.01 - Vegetable Leather
Current Stage
Ref Project

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ASTM D4831-00(2020) - Standard Test Method for Buckle Tear Strength of LeatherASTM D4831-00(2020) - Standard Test Method for Buckle Tear Strength of Leather
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ASTM D4831-00(2020) - Standard Test Method for Buckle Tear Strength of Leather
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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: D4831 − 00 (Reapproved 2020)
Standard Test Method for
1
Buckle Tear Strength of Leather
This standard is issued under the fixed designation D4831; 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 0.025 in. (10.2 6 0.6 mm) in diameter and a flat anvil 0.4 6
0.025 in. in diameter. The spring shall exert a force of 1 lbf
1.1 This test method is intended for use on all types of
(4.45 N) on the foot when the gauge reads 2 oz and 2 lbf (8.9
leather to determine the load required to tear a leather strap
N) when the gauge reads 12 oz.
fastened in a buckle. This test method does not apply to wet
3
blue. 3.2 Steel Punch, which will make a ⁄16 in. (4.8 mm)
diameter hole.
1.2 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
3.3 Harness Buckle, 1.25 in. (4.7 mm) with a 0.175 6
conversions to SI units that are provided for information only 0.005-in. (4.4 6 0.1-mm) diameter tongue. It shall be attached
and are not considered standard.
to a strong strap, 1.25 in. wide and at least 5 in. (127 mm) long.
The strap shall be equipped with a keeper located approxi-
1.3 This standard does not purport to address all of the
mately 0.75 in. (19 mm) from the buckle.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3.4 Testing Machine, power-driven. The applied load shall
priate safety, health, and environmental practices and deter-
be indicated on a dial, scale, or chart. The load indicator shall
mine the applicability of regulatory limitations prior to use.
record or indicate the maximum load at the time of rupture of
1.4 This international standard was developed in accor-
the specimen. The machine shall be equipped with a set of
dance with internationally recognized principles on standard-
grips for clamping the specimens.The faces of the grips should
ization established in the Decision on Principles for the
be knurled or otherwise roughened to prevent slipping of the
1
Development of International Standards, Guides and Recom-
specimen. The gripping surfaces shall be at least 1 by 1 ⁄2 in.
mendations issued by the World Trade Organization Technical
(25.4 by 38 mm). The grips shall be mounted with the longer
Barriers to Trade (TBT) Committee.
dimension perpendicular to the direction of the application of
the load. The speed of the power-activated grip shall be a
2. Significance and Use
uniform speed of 10 6 2 in. (254 6 50 mm)/min when running
2.1 This test method is designed to measure the load
free. The error of the machine up to a load of 50 lbf (222 N)
required to tear a leather strap fastened in a buckle.Tanners and
shall not exceed 2 %; at loads of more than 50 lbf the error
leather buyers have found that this test gives an indication of
shall not exceed 1 %.
the resistance of leather to tearing.
4. Sampling, Test Specimens, and Test Units
2.2 This test method should be suitable for specification
acceptance, design purposes, manufacturing control,
4.1 The specimen shall be a piece of leather 1 by 8 in. (25
development, and research. The thickness of the specimen and
by 200 mm). Note the direction of the long axis relative to the
direction of tear relative to the backbone will affect the
backbone.
uniformity of the test results. This test method may not apply
5. Procedure
when the conditions of the test employed differ widely from
those specified in this test method.
3
5.1 Punch a ⁄16-in. (4.76-mm) hole on the long axis of the
specimen 3 in. (76.2 mm) from one end.
3. Apparatus
5.2 Measure the thickness of the specimen to the nearest 0.5
3.1 Gauge, spring-type, for measuring thickness of units,
oz (0.2 mm) of the long axis between the hole and the short
graduated in 0.5 oz or 0.1 mm having a flat pressure foot 0.4 6
end. Place the gauge foot adjacent to, but not overlapping, the
1 hole.
This test method is under the jurisdiction ofASTM Committee D31 on Leather
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather.
5.3 Fit the specimen in the buckle with the tongue of the
Current edition approved Dec. 1, 2020. Published December 2020. Originally
buckle in the hole and the short end of the specimen under the
approved in 1988. Last previous edition approved in 2016 as D4831 – 00 (2016).
DOI: 10.1520/D4
...

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