Standard Test Method for Elongation of Narrow Elastic Fabrics (Static-Load Testing)

SIGNIFICANCE AND USE
This test method is considered satisfactory for acceptance testing of commercial shipments of narrow elastic fabrics because the test method is used in the trade for acceptance testing.
5.1.1 In case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the parties should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using student’t-test for unpaired data and an acceptable probability level chosen by the two parties before testing is begun. If bias is found, either the cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results in the light of the known bias.
This test method specifies the use of a static load apparatus. Users of this test method are cautioned that elongation test data obtained using this test method are not comparable to elongation test data obtained using either constant-rate-of-extension (CRE) or constant-rate-of-loading (CRL) type tensile testing machines.
SCOPE
1.1 This test method determines the elongation characteristics of narrow elastic fabrics made from natural or man-made elastomers, either alone or in combination with other textile fibers, when tested with a static load testing procedure before or after laundering. Note 1For determination of similar characteristics using the constant-rate-of-extension (CRE) type tensile testing machine, refer to Test Method D 4964.
Note 2
For determination of similar characteristics using the constant-rate-of load (CRL) type tensile testing machine, refer to Test Method D 1775.
1.2 The use of this test method requires the selection of, or mutual agreement upon, the effective static load at which the test results will be determined.
1.3 Laundering procedures used will be those specified in Test Method AATCC 135 for 3 washing and drying cycles.
1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specifications.
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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ASTM D5278-98(2004) - Standard Test Method for Elongation of Narrow Elastic Fabrics (Static-Load Testing)
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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:D5278–98 (Reapproved 2004)
Standard Test Method for
Elongation of Narrow Elastic Fabrics (Static-Load Testing)
This standard is issued under the fixed designation D 5278; 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 D 1776 Practice for Conditioning Textiles for Testing
D 4964 Test Method for Tension and Elongation of Elastic
1.1 This test method determines the elongation characteris-
Fabrics (Constant-Rate-of-Extension Type Tensile Testing
tics of narrow elastic fabrics made from natural or man-made
Machine)
elastomers, either alone or in combination with other textile
2.2 AATCC Test Method:
fibers, when tested with a static load testing procedure before
135 Dimensional Changes in Automatic Home Laundering
or after laundering.
of Woven and Knit Fabrics
NOTE 1—For determination of similar characteristics using the
constant-rate-of-extension (CRE) type tensile testing machine, refer to
3. Terminology
Test Method D 4964.
3.1 Definitions:
NOTE 2—For determination of similar characteristics using the
3.1.1 elongation, n—the ratio of the extension of a material
constant-rate-of load (CRL) type tensile testing machine, refer to Test
to the length of the material prior to stretching. (Compare
Method D 1775.
extension.)
1.2 The use of this test method requires the selection of, or
3.1.2 marrow elastic fabric, n—an elastic fabric that is less
mutual agreement upon, the effective static load at which the
than 150 mm [6 in.] in width.
test results will be determined.
3.1.3 static load, n—in textile testing, a mass which exerts
1.3 Laundering procedures used will be those specified in
a force by means of the mass alone without motion (synonym,
Test Method AATCC 135 for 3 washing and drying cycles.
dead load).
1.4 The values stated in either inch-pound units or SI units
are to be regarded separately as standard. Within the text, the
4. Summary of Test Method
inch-pound units are shown in brackets. The values stated in
4.1 Conditioned test specimens, laundered or unlaundered,
each system are not exact equivalents; therefore, each system
are suspended and subjected to a specified loading. The static
shall be used independently of the other. Combining values
load is applied for a specified time, released, and the cycle
from the two systems may result in nonconformance with the
repeated two more times. The percent elongation is read
specifications.
directly from the scale on the apparatus.
1.5 This standard does not purport to address all of the
safety problems, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
5.1 This test method is considered satisfactory for accep-
priate safety and health practices and determine the applica-
tancetestingofcommercialshipmentsofnarrowelasticfabrics
bility of regulatory limitations prior to use.
because the test method is used in the trade for acceptance
testing.
2. Referenced Documents
5.1.1 In case of a dispute arising from differences in
2.1 ASTM Standards:
reported test results when using this test method for acceptance
D 123 Terminology Relating to Textile Materials
testing of commercial shipments, the parties should conduct
D 1775 Test Method for Tension and Elongation of Wide
comparative tests to determine if there is a statistical bias
Elastic Fabrics
between their laboratories. Competent statistical assistance is
recommended for the investigation of bias.As a minimum, the
two parties should take a group of test specimens that are as
This test method is under the jurisdiction ofASTM Committee D13 onTextiles
homogeneous as possible and that are from a lot of material of
and is the direct responsibility of Subcommittee D13.59 on Fabric Test Methods,
the type in question. The test specimens should then be
General.
randomly assigned in equal numbers to each laboratory for
Current edition approved Dec. 1, 2004. Published January 2005. Originally
approved in 1992. Last previous edition approved in 1992 as D 5278–92.
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 Available from American Association of Textile Chemists and Colorists, P.O.
the ASTM website. Box 12215, Research Triangle Park, NC 27709.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D5278–98 (2004)
testing.Theaverageresultsfromthetwolaboratoriesshouldbe Unless the fabric width exceeds 75 mm [3 in.], use the full
compared using student’s t-test for unpaired data and an fabric width as the test specimen width.
acceptable probability level chosen by the two parties before 8.1.3.2 With the bench marker, make two marks on the test
testingisbegun.Ifbiasisfound,eitherthecausemustbefound specimen that are 250 mm [10 in.] apart, approximately the
and corrected or the purchaser and the supplier must agree to samedistancefromthetestspecimenendsandperpendicularto
interpret future test results in the light of the known bias. the long direction of the test sp
...

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