ASTM D4786-00(2020)

Standard Test Method for Stitch Tear Strength, Single Hole

SIGNIFICANCE AND USE
3.1 This test method is intended to be used to rate leathers as to their stitch tear strengths.
SCOPE
1.1 This test method is intended for determining the stitch-tearing strength of leather with a tear originating from one hole. It is particularly applicable to heavy leather. This test method does not apply to wet blue.  
1.2 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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.

General Information

• Status: Published
• Publication Date: 30-Nov-2020
• ICS: 59.080.30 - Textile fabrics
• Technical Committee: D31 - Leather
• Drafting Committee: D31.01 - Vegetable Leather

Relations

• Refers: ASTM D1813-13 - Standard Test Method for Measuring Thickness of Leather Test Specimens
• Effective Date: 01-May-2013
• Refers: ASTM D1813-00(2010) - Standard Test Method for Measuring Thickness of Leather Test Specimens
• Effective Date: 01-Oct-2010
• Refers: ASTM D2209-00(2010) - Standard Test Method for Tensile Strength of Leather
• Effective Date: 01-Apr-2010
• Refers: ASTM D1813-00(2005) - Standard Test Method for Measuring Thickness of Leather Test Specimens
• Effective Date: 01-Apr-2005
• Refers: ASTM D2209-00(2004) - Standard Test Method for Tensile Strength of Leather
• Effective Date: 01-Sep-2004
• Refers: ASTM D2209-00 - Standard Test Method for Tensile Strength of Leather
• Effective Date: 10-Sep-2000
• Refers: ASTM D1813-00 - Standard Test Method for Measuring Thickness of Leather Test Specimens
• Effective Date: 10-May-2000

Standards Content (Sample)

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: D4786 − 00 (Reapproved 2020)
Standard Test Method for
Stitch Tear Strength, Single Hole
This standard is issued under the fixed designation D4786; 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 4.2 Steel Punch, beveled on the outside, which will make a
⁄8 in. diameter hole.
1.1 This test method is intended for determining the stitch-
tearing strength of leather with a tear originating from one
4.3 Metal Yoke, made to the dimension shown in Fig. 1.
hole. It is particularly applicable to heavy leather. This test
4.4 Steel Rod, 0.095 6 0.005 in. in diameter and at least 1
method does not apply to wet blue.
in. long.
1.2 The values stated in inch-pound units are to be regarded
4.5 Testing Machine, power-driven, as described in Test
as standard. No other units of measurement are included in this
Method D2209.
standard.
1.3 This standard does not purport to address all of the
5. Test Specimen
safety concerns, if any, associated with its use. It is the
5.1 The test specimen shall be a rectangular piece of leather
responsibility of the user of this standard to establish appro-
1 in. by 2 in. die cut from the sample unit of leather. The end
priate safety, health, and environmental practices and deter-
of the specimen in which the hole is to be punched shall be at
mine the applicability of regulatory limitations prior to use.
least 1 in. away from any uncut edge on the unit. The direction
1.4 This international standard was developed in accor-
of the long axis relative to the backbone shall be noted.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
6. Procedure
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
6.1 Place the specimen on the anvil of the thickness gage
Barriers to Trade (TBT) Committee.
and lower the presser foot gently (do not drop) until it rests on
the specimen.Take the reading 5 s after the full load is reached.
2. Referenced Documents
Read the thickness to the nearest 0.001 in. The thickness of the
2.1 ASTM Standards:
specimen should be taken on the long axis near the end in
D1813 Test Method for Measuring Thickness of Leather
which the hole is to be punched.
Test Specimens
6.2 Punch a ⁄8 in. diameter hole on the long axis of the
D2209 Test Method for Tensile Strength of Leather
specimen. The center of the hole should be ⁄32 in. from the end
on which the thickness was measured.
3. Significance and Use
3.1 This test method is intended to be used to rate leathers
6.3 Grip the yoke in one of the testing machine jaws. Place
as to their stitch tear strengths.
the end of the specimen containing the hole between the arms
of the yoke and pass the steel rod through the holes in the yoke
4. Apparatus
and the specimen. Clamp the free end of the specimen in the
4.1 Thickness Gage—A dead-mass type of thickness gage, other testing machine grip. Operate the machine at 10 6 2 in.
as described in Test Method D1813.
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