ASTM D4704-13(2023)

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: D4704 − 13 (Reapproved 2023)
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 U.S. Department of Defense.
1. Scope 3.1.1 tongue tear strength—the load required to tear the
leather between two tongues formed by splitting the leather
1.1 This test method is intended for determining the tearing
perpendicular to its surface.
strength of leather by measuring the force required to tear a
specimen cut perpendicular to the surface. This test method
4. Significance and Use
does not apply to wet blue.
4.1 Knowledge of the strength of the sample can be a
1.2 The values stated in inch-pound units are to be regarded
determining factor for the end use of the product.
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
5. Apparatus
and are not considered standard.
1.3 This standard does not purport to address all of the 5.1 Testing Machine, as described in Test Method D2209.
safety concerns, if any, associated with its use. It is the
5.2 Thickness Gauge,adeadweighttypeofthicknessgauge
responsibility of the user of this standard to establish appro-
as described in Test Method D1813.
priate safety, health, and environmental practices and deter-
5.3 Steel Die, to cut test specimens.
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
6. Sampling and Test Specimens
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
6.1 Unlessotherwisespecified,sampletheleatheraccording
Development of International Standards, Guides and Recom-
to Practice D2813.
mendations issued by the World Trade Organization Technical
6.2 The specimen shall be a rectangular piece of leather,
Barriers to Trade (TBT) Committee.
1 in. × 4 in. (25.4 mm × 101.6 mm) by the full thickness of the
2. Referenced Documents unit. It shall have a ⁄16 in. (4.76 mm) hole located on the long
2 axis 1 in. (25.4 mm) from one end and shall be split along its
2.1 ASTM Standards:
axis from the hole to the other end to form two tongues. The
D1610 Practice for Conditioning Leather and Leather Prod-
direction of the long axis of the specimen relative to the
ucts for Testing
backbone shall be noted. See Fig. 1.
D1813 Test Method for Measuring Thickness of Leather
Test Specimens
7. Conditioning
D2209 Test Method for Tensile Strength of Leather
D2813 Practice for Sampling Leather for Physical and 7.1 All specimens shall be conditioned and tested in an
Chemical Tests
atmosphere as described in Practice D1610.
3. Terminology
8. Procedure
3.1 Definitions of Terms Specific to This Standard:
8.1 Determine the thickness of the specimen to the nearest
0.001 in. (0.01 mm) on the long axis between the hole and the
1 unsplit end of the specimen. The gauge foot shall be adjacent
This test method is under the jurisdiction ofASTM Committee D31 on Leather
and is the direct responsibility of Subco
...