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ASTM

ASTM D4704-00(2005)

(Test Method)

Standard Test Method for Tearing Strength, Tongue Tear of Leather

Standard Test Method for Tearing Strength, Tongue Tear of Leather

SIGNIFICANCE AND USE
Knowledge of the strength of the sample can be a determining factor for the end use of the product.
SCOPE
1.1 This test method is intended for determining the tearing strength of leather by measuring the force required to tear a specimen cut perpendicular to the surface. This test method does not apply to wet blue.  
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information only.
1.3 This standard does not purport to address all of the safety problems, 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-Mar-2005
ICS
59.140.30 - Leather and furs
Technical Committee
D31 - Leather
Drafting Committee
D31.07 - Physical Properties
Current Stage
Ref Project

Relations

Replaces
ASTM D4704-00 - Standard Test Method for Tearing Strength, Tongue Tear of Leather
Effective Date
01-Apr-2005
Replaced By
ASTM D4704-00(2010) - Standard Test Method for Tearing Strength, Tongue Tear of Leather
Effective Date
01-Oct-2010

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ASTM D4704-00(2005) - Standard Test Method for Tearing Strength, Tongue Tear of LeatherASTM D4704-00(2005) - Standard Test Method for Tearing Strength, Tongue Tear of Leather
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ASTM D4704-00(2005) - Standard Test Method for Tearing Strength, Tongue Tear 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D4704–00 (Reapproved 2005)
Standard Test Method for
Tearing Strength, Tongue Tear of Leather
This standard is issued under the fixed designation D4704; 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 5. Apparatus
1.1 This test method is intended for determining the tearing 5.1 Testing Machine, as described in Test Method D2209.
strength of leather by measuring the force required to tear a 5.2 Thickness Gage, a dead weight type of thickness gage as
specimen cut perpendicular to the surface. This test method described in Test Method D1813.
does not apply to wet blue. 5.3 Steel Die, to cut test specimens.
1.2 The values stated in inch-pound units are to be regarded
6. Sampling and Test Specimens
as the standard. The values given in parentheses are provided
for information only. 6.1 Unless otherwise specified, sample the leather according
to Practice D2813.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 6.2 The specimen shall be a rectangular piece of leather,
1 3 4 in. (25.4 3 101.6 mm) by the full thickness of the unit.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- It shall have a ⁄16 in. (4.76 mm) hole located on the long axis
1 in. (25.4 mm) from one end and shall be split along its axis
bility of regulatory limitations prior to use.
from the hole to the other end to form two tongues. The
2. Referenced Documents
direction of the long axis of the specimen relative to the
2.1 ASTM Standards: backbone shall be noted. See Fig. 1.
D1610 Practice for Conditioning Leather and Leather Prod-
7. Conditioning
ucts for Testing
D1813 Test Method for Measuring Thickness of Leather 7.1 All specimens shall be conditioned for 48 h in an
Test Specimens atmosphere maintained at 73.4 6 3.6°F (23 6 2°C) and 50 6
4 % relative humidity and tested under the conditions as
D2209 Test Method for Tensile Strength of Leather
D2813 Practice for Sampling Leather for Physical and described in Practice D1610.
Chemical Tests
8. Procedure
3. Terminology
8.1 Determine the thickness of the specimen to the nearest
0.5 oz (0.2 mm) on the long axis between the hole and the
3.1 Definitions of Terms Specific to This Standard:
3.1.1 tongue tear strength—the load required to tear the unsplit end of the specimen. The gage foot shall be adjacent to,
but shall not overlap, the hole.
leather between two tongues formed by splitting the leather
perpendicular to its surface. 8.2 Clamp one of the tongues on the specimen in each of the
testing grips so that the long axis of the tongue is in the
4. Significance and Use
direction of the motion of the movable grip. The faces of the
4.1 Knowledge of the strength of the sample can be a grips shall be approximately 2 in. (50.8 mm) from the common
determining factor for the end use of the product
...

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