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ASTM D4831-00

(Test Method)

Standard Test Method for Buckle Tear Strength of Leather

Standard Test Method for Buckle Tear Strength of Leather

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
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 D4831-00(2005) - Standard Test Method for Buckle Tear Strength of Leather
Effective Date
01-Sep-2005

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ASTM D4831-00 - Standard Test Method for Buckle Tear Strength of LeatherASTM D4831-00 - Standard Test Method for Buckle Tear Strength of Leather
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ASTM D4831-00 - Standard Test Method for Buckle Tear Strength of Leather
English language
2 pages
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D4831–00
Standard Test Method for
Buckle Tear Strength of Leather
This standard is issued under the fixed designation D 4831; 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 3.4 Testing Machine, power-driven. The applied load shall
be indicated on a dial, scale, or chart. The load indicator shall
1.1 This test method is intended for use on all types of
record or indicate the maximum load at the time of rupture of
leather to determine the load required to tear a leather strap
the specimen. The machine shall be equipped with a set of
fastened in a buckle. This test method does not apply to wet
grips for clamping the specimens.The faces of the grips should
blue.
be knurled or otherwise roughened to prevent slipping of the
1.2 This standard does not purport to address all of the
specimen. The gripping surfaces shall be at least 1 by 1 ⁄2 in.
safety concerns, if any, associated with its use. It is the
(25.4 by 38 mm). The grips shall be mounted with the longer
responsibility of the user of this standard to establish appro-
dimension perpendicular to the direction of the application of
priate safety and health practices and determine the applica-
the load. The speed of the power-activated grip shall be a
bility of regulatory limitations prior to use.
uniform speed of 10 6 2 in. (254 6 50 mm)/min when running
2. Significance and Use free. The error of the machine up to a load of 50 lbf (222 N)
shall not exceed 2 %; at loads of more than 50 lbf the error
2.1 This test method is designed to measure the load
shall not exceed 1 %.
required to tear a leather strap fastened in a buckle.Tanners and
leather buyers have found that this test gives an indication of
4. Sampling, Test Specimens, and Test Units
the resistance of leather to tearing.
4.1 The specimen shall be a piece of leather 1 by 8 in. (25
2.2 This test method should be suitable for specification
by 200 mm). Note the direction of the long axis relative to the
acceptance, design purposes, manufacturing control, develop-
backbone.
ment, and research. The thickness of the specimen and direc-
tion of tear relative to the backbone will affect the uniformity
5. Procedure
of the test results. This test method may not apply when the
5.1 Punch a ⁄16-in. (4.76-mm) hole on the long axis of the
conditions of the test employed differ widely from those
specimen 3 in. (76.2 mm) from one end.
specified in this test method.
5.2 Measure the thickness of the specimen to the nearest 0.5
3. Apparatus oz (0.2 mm) of the long axis between the hole and the short
end. Place the gage foot adjacent to, but not overlapping, the
3.1 Gage, spring-type, for measuring thickness of units,
hole.
graduated in 0.5 oz or 0.1 mm having a flat pressure foot 0.4 6
5.3 Fit the specimen in the buckle with the tongue of the
0.025 in. (10.2 6 0.6 mm) in diameter and a flat anvil 0.4 6
buckle in the hole and the short end of the specimen under the
0.025 in. in diameter. The spring shall exert a force of 1 lbf
keeper. Clamp the other end of the specimen in one of the
(4.45 N) on the foot when the gage re
...

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