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ASTM D4704-00

(Test Method)

Standard Test Method for Tearing Strength, Tongue Tear of Leather

Standard Test Method for Tearing Strength, Tongue Tear of Leather

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
09-Sep-2000
ICS
59.140.30 - Leather and furs
Technical Committee
D31 - Leather
Drafting Committee
D31.07 - Physical Properties
Current Stage
Ref Project

Relations

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

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ASTM D4704-00 - Standard Test Method for Tearing Strength, Tongue Tear of LeatherASTM D4704-00 - Standard Test Method for Tearing Strength, Tongue Tear of Leather
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ASTM D4704-00 - Standard Test Method for Tearing Strength, Tongue Tear 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D4704–00
Standard Test Method for
Tearing Strength, Tongue Tear of Leather
This standard is issued under the fixed designation D 4704; 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 5.2 Thickness Gage, a dead weight type of thickness gage as
described in Test Method D 1813.
1.1 This test method is intended for determining the tearing
5.3 Steel Die, to cut test specimens.
strength of leather by measuring the force required to tear a
specimen cut perpendicular to the surface. This test method
6. Sampling and Test Specimens
does not apply to wet blue.
6.1 Unless otherwise specified, sample the leather according
1.2 The values stated in inch-pound units are to be regarded
to Practice D 2813.
as the standard. The values given in parentheses are provided
6.2 The specimen shall be a rectangular piece of leather,
for information only.
1 3 4 in. (25.4 3 101.6 mm) by the full thickness of the unit.
1.3 This standard does not purport to address all of the
It shall have a ⁄16 in. (4.76 mm) hole located on the long axis
safety concerns, if any, associated with its use. It is the
1 in. (25.4 mm) from one end and shall be split along its axis
responsibility of the user of this standard to establish appro-
from the hole to the other end to form two tongues. The
priate safety and health practices and determine the applica-
direction of the long axis of the specimen relative to the
bility of regulatory limitations prior to use.
backbone shall be noted. See Fig. 1.
2. Referenced Documents
7. Conditioning
2.1 ASTM Standards:
7.1 All specimens shall be conditioned for 48 h in an
D 1610 Practice for Conditioning Leather and Leather
2 atmosphere maintained at 73.4 6 3.6°F (23 6 2°C) and 50 6
Products for Testing
4 % relative humidity and tested under the conditions as
D 1813 Test Method for Measuring Thickness of Leather
2 described in Practice D 1610.
Test Specimens
D 2209 Test Method for Tensile Strength of Leather
8. Procedure
D 2813 Practice for Sampling Leather for Physical and
2 8.1 Determine the thickness of the specimen to the nearest
Chemical Tests
0.5 oz (0.2 mm) on the long axis between the hole and the
3. Terminology unsplit end of the specimen. The gage foot shall be adjacent to,
but shall not overlap, the hole.
3.1 Definitions of Terms Specific to This Standard:
8.2 Clamp one of the tongues on the specimen in each of the
3.1.1 tongue tear strength—the load required to tear the
testing grips so that the long axis of the tongue is in the
leather between two tongues formed by splitting the leather
direction of the motion of the movable grip. The faces of the
perpendicular to its surface.
grips shall be approximately 2 in. (50.8 mm) from the common
4. Significance and Use base of the tongues (from the hole).
8.3 Operate the machine at 10 6 2 in. (254 6 50.8 mm)
...

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