Standard Test Method for Stitch Tear Strength of Leather, Double Hole

SCOPE
1.1 This test method is intended for use in determining the stitch tearing resistance of leather using a double hole tear. It is particularly applicable to lightweight leathers. 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.

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Historical
Publication Date
09-Sep-2000
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Drafting Committee
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ASTM D4705-00 - Standard Test Method for Stitch Tear Strength of Leather, Double Hole
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D4705–00
Standard Test Method for
Stitch Tear Strength of Leather, Double Hole
This standard is issued under the fixed designation D 4705; 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 4. Apparatus
1.1 This test method is intended for use in determining the 4.1 Testing Machine, as described in Test Method D 2209.
stitch tearing resistance of leather using a double hole tear. It is 4.2 ThicknessGage, a dead weight type of thickness gage as
particularly applicable to lightweight leathers.This test method described in Method D 1813.
does not apply to wet blue. 4.3 Steel Die, to cut test specimens (as described in 5.1).
1.2 The values stated in inch-pound units are to be regarded 4.4 Paper Clip, #1/Premium, with wire diameter 0.041 6
as the standard. The values given in parentheses are provided 0.001 in. (1.04 6 0.0254 mm).
for information only.
5. Sampling Test Specimen
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 5.1 Unless otherwise specified, sample the leather according
to Practice D 2813.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 5.2 The specimen shall be a rectangle of leather 2 in. (50.8
mm) in length and 1 in. (25.4 mm) in width with two holes ( ⁄64
bility of regulatory limitations prior to use.
in. (1.98 mm)) in diameter on one end of the specimen. The
2. Referenced Documents 1 1
centers of the holes shall be ⁄4 in. (6.35 mm) from the end, ⁄4
2.1 ASTM Standards: in. (6.35 mm) apart, and located equidistant from the center
D 1610 Practice for Conditioning Leather and Leather line (length wise) of the specimen. See Fig. 1.
Products for Testing 5.3 The specimen shall be cut with the long dimension
D 1813 Test Method for Measuring Thickness of Leather perpendicular to the backbone.
Test Specimens
6. Conditioning
D 2209 Test Method for Tensile Strength of Leather
D 2813 Practice for Sampling Leather for Physical and 6.1 All specimen shall be conditioned for 48 h in an
atmosphere maintained at 73.4 6 3.6°F (23 6 2°C) and 50 6
Chemical Tests
4 % relative humidity and tested under the conditions as
3. Significance and Use
described in Practice D 1610.
3.1 This test method is designed to measure the load
7. Procedure
required to tear leather through two holes in the test specimen.
7.1 Determine the thickness of the specimen to the nearest
Tanners and leather buyers have found that this test gives an
indication of the resistance of leather to tearing. It is of 0.5 oz (0.2 mm) on the long axis near one end.
7.2 Bend the wire into a “U” shape, preferably by bending
particular value in estimating the durability of leather to
withstand tearing stresses encountered in the manufacture of overa ⁄4in.(6.35mm)rod,andpasstheendsthroughtheholes
in the specimen so that both ends project from the flesh side of
shoes, garments, and upholstered products. The thickness
...

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