ASTM D4964-96(2008)e2

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
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Designation:D4964–96 (Reapproved 2008)
Standard Test Method for
Tension and Elongation of Elastic Fabrics (Constant-Rate-
of-Extension Type Tensile Testing Machine)
This standard is issued under the fixed designation D4964; 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.
´ NOTE—Minor editorial changes were made throughout in October 2008.
´ NOTE—Section 3 was updated editorially in September 2011 in accordance with the Committee D13 Terminology policy.
1. Scope D1775 Test Method for Tension and Elongation of Wide
Elastic Fabrics
1.1 This test method covers the measurement of tension and
D1776 Practice for Conditioning and Testing Textiles
elongation of wide or narrow elastic fabrics made from natural
D4850 Terminology Relating to Fabrics and Fabric Test
or man-made elastomers, either alone or in combination with
Methods
other textile yarns, when tested with a constant-rate-of-
extension (CRE) type tensile testing machine.
3. Terminology
NOTE 1—For determination of similar testing using the constant-rate-
3.1 For all terminology related to Subcommittee D13.59 on
of-load (CRL) type tensile testing machine, refer to Test Method D1775.
Fabric Test Methods, General, see Terminology D4850.
1.2 The use of this test method requires the selection of, or
3.2 The following terms are relevant to this standard:
mutual agreement upon, loop tension(s) and elongation(s) at
constant-rate-of-extension tensile testing machine (CRE),
which the test results will be determined.
constant-rate-or-load tensile testing machine (CRL), elastic
1.3 Laundering procedures require mutual agreement on the
fabric, elongation, extension, extension-recovery cycle, force,
selection of temperature and number of washing cycles and
loop tension, narrow elastic fabric, tension, tension-recovery
drying cycles to be used.
chart, tension test, wide elastic fabric.
1.4 The values stated in SI units or inch-pound units are to
3.3 FordefinitionsofallothertextiletermsseeTerminology
be regarded separately as standard. The values stated in each
D123.
system may not be exact equivalents; therefore each system
4. Summary of Test Method
must be used independently of the other, without combining
values in any way.
4.1 Loop Tension at Specified Elongation(s)—A condi-
1.5 This standard does not purport to address all of the tioned loop specimen is mounted in a CRE-type tensile testing
safety concerns, if any, associated with its use. It is the
machine. The specimen is then extended at a specified rate to
responsibility of the user of this standard to establish appro- a specified loop tension, and returned at a specified rate to zero
priate safety and health practices and determine the applica-
tension. The cycle is repeated two more times to give a total of
bility of regulatory limitations prior to use. threecycles.Duringthetest,extension-recoverycurvesmaybe
plotted by an automatic recorder for all or only the third cycle.
2. Referenced Documents
The tension at specified percent elongation(s) is calculated
2.1 ASTM Standards:
from the graph of the third cycle or obtained from the
D76 Specification for Tensile Testing Machines for Textiles
instrument.
D123 Terminology Relating to Textiles
4.2 Elongation at Specified Loop Tension—A conditioned
loop specimen is mounted in a CRE-type tensile testing
machine. The specimen is then loaded at a specified rate to a
This test method is under the jurisdiction ofASTM Committee D13 onTextiles
specified loop tension, and unloaded at a specified rate to zero
and is the direct responsibility of Subcommittee D13.59 on Fabric Test Methods,
General. loop tension. The cycle is repeated two more times to give a
Current edition approved July 1, 2008. Published October 2005. Originally
total of three cycles. During the test, tension-recovery curves
approved in 1989. Last previous edition approved in 2004 as D4964 – 96(2004).
maybeplottedbyanautomaticrecorderforalloronlythethird
DOI: 10.1520/D4964-96R08E02.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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 Withdrawn. The last approved version of this historical standard is referenced
the ASTM website. on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D4964–96 (2008)
cycle. The elongation at a specified loop tension is calculated 6. Apparatus
from the graph of the third cycle or obtained from the
6.1 Tensile Testing Machine, CRE-Type, conforming to
instrument.
Specification D76, equipped with an automatic recording
device and cycling controls.
5. Significance and Use
6.2 Band Clamps, to hold loop specimen during testing.The
diameter of the anvils will be 13.06 0.25 mm (0.5 6 0.01 in.)
5.1 This test method for testing loop tension and elongation
or 6.56 0.25 mm (0.25 6 0.01 in.).The length of the anvil will
of elastic fabrics is considered satisfactory for acceptance
not be less than 76 mm (3.0 in.).
testing of commercial shipments of elastic fabrics because the
6.3 Sewing Machine Single-Needle.
test method is used in the trade for acceptance testing.
5.1.1 In case of a dispute arising from differences in
7. Sampling
reported test results when using this test method for acceptance
7.1 Lot Sample—As a lot sample for acceptance testing,
testing of commercial shipments, the parties should conduct
take at random the number of rolls of fabric as directed in an
comparative tests to determine if there is a statistical bias
applicable material specification or other agreement between
between their laboratories. Competent statistical assistance is
thepurchaserandthesupplier.Considerrollsoffabrictobethe
recommended for the investigation of bias.As a minimum, the
primary sampling units.
two parties should take a group of test specimens that are as
homogeneous as possible and that are from a lot of material of NOTE 2—An adequate specification or other agreement between the
purchaser and the supplier requires taking into account the variability
the type in question. The test specimens should then be
between rolls of fabric, and the variability between specimens from a
randomly assigned in equal numbers to each laboratory for
swatch from a roll of fabric, to provide a sampling plan with a meaningful
testing.Theaverageresultsfromthetwolaboratoriesshouldbe
producer’s risk, consumer’s risk, acceptable quality level, and limiting
compared using student’s t-test for unpaired data and an
quality level.
acceptable probability level chosen by the two parties before
7.2 Laboratory Sample—As a laboratory sample for accep-
the testing is begun. If bias is found, either its cause must be
tance testing, take a full width swatch,2m(2yd) long, from
found and corrected or the purchaser and the supplier must
the end of each roll of fabric in the lot sample, after first
agree to interpret future test results with consideration to the
discarding a minimum of1m(1yd)of fabric from the very
known bias.
outside of the roll.
5.2 This test method specifies the use of the CRE-type
7.3 Test Specimens—Take test specimens as follows:
tensile testing machine. Users of this test method are cautioned
7.3.1 Wide Elastic Fabrics—If the purchaser and the sup-
that loop tension test data obtained using this method are not
plier agree to test the fabric in only one direction, cut five
comparable to tension test data obtained using Test Method
specimens from each swatch in the laboratory sample with the
D1775 because of the differences in testing machines. Test
long dimension of the specimens parallel to the direction of
Method D1775 uses a CRL-type tensile testing machine.
test. If the purchaser and the supplier agree to test the fabric in
5.3 The loop tension and extension relationship of an elastic
both directions, from each full-width swatch in the laboratory
fabric is an important criterion for judging the suitability of the
sample, cut five specimens parallel to the long dimension and
fabric for various end uses, such as: foundation garments,
five specimens perpendicular to the long dimension. Speci-
brassieres, and swimsuits.
mens should be spaced along a diagonal to allow for represen-
5.4 Data from loop tension-recovery curves can be com-
tation in each specimen of different warp and filling areas, or
pared only if the tension testing machine, rate-of-extension,
waleandcourseareas.Takenospecimensnearerthanonetenth
maximum loading (or extension), and specimen specifications
of the fabric width from the selvage.
are comparable. Since different machine set-ups will cause
7.3.2 Narrow Elastic Fabric—Cut five specimens from
different results on the same fabric, machine set-ups must
each swatch in the laboratory sample. For narrow knitted or
always be specified before making a test and be reported with
woven elastic fabrics that are more than 75 mm (3 in.) wide,
the test results.
the purchaser and the supplier may agree to (1) use specimens
5.5 The test for measuring loop tension at specified elonga-
of the widths specified in 8.1.1 for wide elastic fabrics of
tion(s) is used to determine the tension of an elastic fabric
comparable construction, or (2) if wide clamps are available,
when subjected to a specified elongation which is less than the
use full-width specimens.
elongation required to rupture the fabric. The test prescribes
8. Preparation of Test Specimens
points of measurement on the extending (outgoing) cycle only.
5.6 The test for measuring elongation at specified tension(s) 8.1 Cut specimens as directed below:
is used to determine the elongation of an elastic fabric when
subjected to a specified loop tension which is less than the
For additional information on obtaining apparatus, equipment, or supplies that
tensionrequiredtorupturethefabric.Thetestprescribespoints
may be suitable for use in this standard, please visit the ASTM Manufacturers’
of measurement on the loading (outgoing) cycle only. Equipment Directory at www.astm.org.
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D4964–96 (2008)
8.1.1 Wide Elastic Fabric—Cut specimens 350 by 100 mm
(14 by 4 in.). Trim, or ravel woven fabrics by taking yarns
alternately from the two sides, to a width as near 75 62mm
(3 6 0.05 in.), as possible. If fabrics are ravelled to obtain the
specimen width, specimens should contain
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