ASTM D6077-00

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 6077 – 00 (Reapproved 2005)
Standard Test Method for
Trapezoid Tearing Strength of Leather
This standard is issued under the fixed designation D 6077; 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 4.2 The procedure can also be used to determine if there is
any appreciable difference in the relative strength of the fabric
1.1 This test method covers the measurement of the tearing
in the machine and cross-machine directions.
load of nonwoven fabrics by the trapezoid method for leather.
See Test Methods D 1117. This test method does not apply to
5. Apparatus
wet blue.
5.1 Tensile Testing Machine, constant-rate-of-traverse type,
1.2 The values stated in SI units are to be regarded as the
equipped with an autographic recorder to register the applied
standard. The values given in parentheses are for information
load.
only.
5.2 Clamps, with faces measuring 25 by 75 mm (1 by 3 in.)
1.3 This standard does not purport to address all of the
with the longer dimension perpendicular to the direction of
safety concerns, if any, associated with its use. It is the
application of the load.
responsibility of the user of this standard to establish appro-
5.3 Template,optional,havingthedimensionsshowninFig.
priate safety and health practices and determine the applica-
1.
bility of regulatory limitations prior to use.
5.4 Pawls, bolt on a machine to allow motion in only one
2. Referenced Documents direction.
2.1 ASTM Standards:
6. Sampling
D 1117 Test Methods for Nonwoven Fabrics
6.1 Unless otherwise specified, sample as directed, parallel
D 1610 Practice for Conditioning Leather and Leather
and perpendicular to backbone or parallel and perpendicular to
Products for Testing
the cut part.
3. Summary of Test Method
7. Test Specimens
3.1 An outline of a trapezoid (see Fig. 1) is marked on a
7.1 Unless otherwise specified, test ten specimens.
specimen cut for the determination of breaking load, and the
7.2 Cut the test specimens in the machine direction and in
nonparallel sides of the specimen are clamped in the jaws of a
the cross-machine direction.
tensile testing machine. A continuously increasing load is
applied to the specimen in such a way that the tear propagates
8. Conditioning
across the specimen width. The value of the breaking load of
8.1 Condition the test specimens for 24 h at 21 6 2°C (70
the specimen is obtained from the load-elongation (stress-
6 2°F) and 50 6 5 % relative humidity or in accordance with
strain) curve recorded autographically.
Practice D 1610. (The customer may specify.)
4. Significance and Use
9. Procedure
4.1 The trapezoid tearing load is a tension test in which the
9.1 Test properly conditioned test specimens in the standard
strength is determined primarily by the fibers of the composite
atmosphere for testing.
structure and their bonding or interlocking. It is useful for
9.2 Set the clamps at the start of the test 25 61mm(1 6
estimating relative ease of tearing of nonwoven fabrics.
0.05 in.) apart and operate the machine at 300 6 10 mm (12 6
0.40 in.)/min. Select the load range of the testing machine such
This test method is under the jurisdiction ofASTM Committee D31 on Leather
that the break occurs between 10 and 90 % of the
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