Standard Test Method for Elongation of Leather

SIGNIFICANCE AND USE
The elongation measurement may be made at any designated load and is expressed as a percentage of the original distance between the jaws or between bench marks of the unstretched specimen. The speed of the machine is important. Speeds under or more than 10 ± 2 in./min (4.2 ± 0.8 mm/s) will give variables in the results, thus affecting the reproducibility of the method. The direction relative to the backbone and the width of the test specimen determines the magnitude of the elongation. This test method is excellent for development, control, specification acceptance, and service evaluation of leather. This test method may not apply when the conditions of the test employed differ widely from those specified in the test method.
SCOPE
1.1 This test method covers the measurement of the elongation or stretch characteristics of leather produced by a tensile load. This test method is intended for use on all types of leather and with all of the breaking load tests. This test method does not apply to wet blue.
1.2 The values given in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Mar-2005
Technical Committee
Drafting Committee
Current Stage
Ref Project

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ASTM D2211-00(2005) - Standard Test Method for Elongation 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D2211–00 (Reapproved 2005)
Standard Test Method for
Elongation of Leather
This standard is issued under the fixed designation D2211; 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.
1. Scope and the width of the test specimen determines the magnitude of
the elongation. This test method is excellent for development,
1.1 This test method covers the measurement of the elon-
control, specification acceptance, and service evaluation of
gation or stretch characteristics of leather produced by a tensile
leather. This test method may not apply when the conditions of
load.This test method is intended for use on all types of leather
the test employed differ widely from those specified in the test
and with all of the breaking load tests. This test method does
method.
not apply to wet blue.
1.2 The values given in inch-pound units are to be regarded
5. Apparatus
as the standard. The values given in parentheses are for
5.1 Testing Machine, as described in Test Method D2209.
information only.
5.2 Dividers,havinglegsatleast4in.(102mm)longandan
1.3 This standard does not purport to address all of the
adjustable screw arrangement for fixing the distance between
safety concerns, if any, associated with its use. It is the
them.
responsibility of the user of this standard to establish appro-
5.3 Steel Scale, graduated to read in 0.02 in. (0.5 mm).
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6. Test Specimen
6.1 The specimen shall be dumbbell in shape when the test
2. Referenced Documents
2 is made with the tension test. It shall be cut from the test unit
2.1 ASTM Standards:
of leather by means of a die as shown in Fig. 1 of Test Method
D1610 Practice for Conditioning Leather and Leather Prod-
D2209. The direction of the long axis relative to the backbone
ucts for Testing
shall be noted.
D2209 Test Method for Tensile Strength of Leather
6.2 The specimen for narrow strap, welting, lace, and round
3. Terminology belting leathers shall be a piece of leather uniform in width and
6 in. (152 mm) long.
3.1 Definitions:
6.3 The specimen for the grab method of determining
3.1.1 elongation, or stretch—theincreaseinlengthofaspan
breaking load shall be 6 in. (152 mm) long and 3 in. (76 mm)
of specimen under tension.
wide.
4. Significance and Use
7. Conditioning
4.1 The elongation measurement may be made at any
7.1 All specimens shall be conditioned as prescribed in
designated load and is expressed as a percentage of the original
Practice D1610. Conditioning other than as prescribed shall be
distance between the jaws or between bench marks of the
noted in the results.
unstretched specimen. The speed of the machine is important.
Speeds under or more than 10 6 2 in./min (4.2 6 0.8 mm/s)
8. Procedure
will give variables in the results, thus affecting the reproduc-
8.1 Mount the specimen symmetrically with the jaws sepa-
ibility of the method. The direction relative to the backbone
rated a distance of 4 in. (102 mm).
8.2 Operate the machine so that the movable grip travels at
This test method is under the jurisdiction ofASTM Committee D31 on Leather
a speed of 10 6 2 in./min (4.2 6 0.8 mm/s).
and is the direct responsibility of Subcommittee D31.07 on Physical Properties—
8.3 Follow the distance between the jaws or the difference
General. This test method was developed in cooperation with theAmerican Leather
between bench marks with the dividers until the load at which
Chemists Assn.
Current edition approved April 1, 2005. Published May 2005. Originally
the elongation is desired has been reached. Take all measure-
approved in 1963. Last previous edition approved in 2000 as D2211 – 00. DOI:
ments between the inner edges of the jaws or between the inner
10.1520/D2211-00R05.
2 edges of the bench marks. Measure the distance between the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
points of the legs of the dividers to the nearest 0.02 in. (0.5
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D2211–00 (2005)
mm). An autographic attachment is preferred for determining 11.1.1 One Operator, Duplicate Specimens, Same Skin or
the elongation. With thi
...

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