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ASTM

ASTM D4831-00(2005)

(Test Method)

Standard Test Method for Buckle Tear Strength of Leather

Standard Test Method for Buckle Tear Strength of Leather

SIGNIFICANCE AND USE
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.
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  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
31-Aug-2005
ICS
59.140.30 - Leather and furs
Technical Committee
D31 - Leather
Drafting Committee
D31.01 - Vegetable Leather
Current Stage
Ref Project

Relations

Replaces
ASTM D4831-00 - Standard Test Method for Buckle Tear Strength of Leather
Effective Date
01-Sep-2005
Replaced By
ASTM D4831-00(2010) - Standard Test Method for Buckle Tear Strength of Leather
Effective Date
01-Apr-2010

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ASTM D4831-00(2005) - Standard Test Method for Buckle Tear Strength of LeatherASTM D4831-00(2005) - Standard Test Method for Buckle Tear Strength of Leather
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ASTM D4831-00(2005) - Standard Test Method for Buckle Tear Strength of Leather
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D4831–00(Reapproved2005)
Standard Test Method for
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 Department of Defense.
1. Scope 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-
1.1 This test method is intended for use on all types of
mately 0.75 in. (19 mm) from the buckle.
leather to determine the load required to tear a leather strap
3.4 Testing Machine, power-driven. The applied load shall
fastened in a buckle. This test method does not apply to wet
be indicated on a dial, scale, or chart. The load indicator shall
blue.
record or indicate the maximum load at the time of rupture of
1.2 This standard does not purport to address all of the
the specimen. The machine shall be equipped with a set of
safety concerns, if any, associated with its use. It is the
grips for clamping the specimens.The faces of the grips should
responsibility of the user of this standard to establish appro-
be knurled or otherwise roughened to prevent slipping of the
priate safety and health practices and determine the applica-
specimen. The gripping surfaces shall be at least 1 by 1 ⁄2 in.
bility of regulatory limitations prior to use.
(25.4 by 38 mm). The grips shall be mounted with the longer
2. Significance and Use dimension perpendicular to the direction of the application of
the load. The speed of the power-activated grip shall be a
2.1 This test method is designed to measure the load
uniform speed of 10 6 2 in. (254 6 50 mm)/min when running
required to tear a leather strap fastened in a buckle.Tanners and
free. The error of the machine up to a load of 50 lbf (222 N)
leather buyers have found that this test gives an indication of
shall not exceed 2 %; at loads of more than 50 lbf the error
the resistance of leather to tearing.
shall not exceed 1 %.
2.2 This test method should be suitable for specification
acceptance, design purposes, manufacturing control, develop-
4. Sampling, Test Specimens, and Test Units
ment, and research. The thickness of the specimen and direc-
4.1 The specimen shall be a piece of leather 1 by 8 in. (25
tion of tear relative to the backbone will affect the uniformity
by 200 mm). Note the direction of the long axis relative to the
of the test results. This test method may not apply when the
backbone.
conditions of the test employed differ widely from those
specified in this test method.
5. Procedure
3. Apparatus 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.
3.1 Gage, spring-type, for measuring thickness of units,
5.2 Measure the thickness of the specimen to the nearest 0.5
graduated in 0.5 oz or 0.1 mm having a flat pressure foot 0.4 6
oz (0.2 mm) of the long axis between the hole and the short
0.025 in. (10.2 6 0.6 mm) in diameter and a flat anvil 0.4 6
end. Place the gage foot adjacent to, but not overlapping, the
0.025 in. in diameter. The spring shall exert a force of 1 lbf
hole.
(4.45 N) on the foot when th
...

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