ASTM D6479-15(2020)
(Test Method)Standard Test Method for Determining the Edgecomb Resistance of Woven Fabrics Used in Inflatable Restraints
Standard Test Method for Determining the Edgecomb Resistance of Woven Fabrics Used in Inflatable Restraints
SIGNIFICANCE AND USE
5.1 A measurement of a fabric's edgecomb resistance indicates the relative tendency of a fabric to pull apart under seam stress or similar action. The related concepts of yarn slippage and seam slippage are limited to sewn seams, whereas the measurement of edgecomb resistance is made at the edge of a cut part in the absence of a sewn seam. The absence of a sewn seam in this test method eliminates the effect that a particular stitch might have on the tendency of a yarn to slip near an edge of a cut part
5.2 This test method is useful for material design evaluations in such applications as airbags in which seam stress is a major concern.
5.3 This method may be used as a complement to Test Method D5822.
SCOPE
1.1 This test method covers the procedures for determining the resistance to edgecombing of a woven fabric used in inflatable restraints.
1.2 Procedures and apparatus other than those stated in this standard may be used by agreement of purchaser and supplier with the specific deviations from the standard practice acknowledged in the report.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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.
1.5 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
Relations
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: D6479 −15 (Reapproved 2020)
Standard Test Method for
Determining the Edgecomb Resistance of Woven Fabrics
Used in Inflatable Restraints
This standard is issued under the fixed designation D6479; 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 Textiles (Withdrawn 2008)
D5035 Test Method for Breaking Force and Elongation of
1.1 This test method covers the procedures for determining
Textile Fabrics (Strip Method)
the resistance to edgecombing of a woven fabric used in
D5822 Test Method for Determining Seam Strength in
inflatable restraints.
Inflatable Restraint Cushions
1.2 Procedures and apparatus other than those stated in this
D6799 Terminology Relating to Inflatable Restraints
standard may be used by agreement of purchaser and supplier
E691 Practice for Conducting an Interlaboratory Study to
with the specific deviations from the standard practice ac-
Determine the Precision of a Test Method
knowledged in the report.
3. Terminology
1.3 The values stated in SI units are to be regarded as
3.1 For all terminology relating to D13.20, Inflatable
standard. No other units of measurement are included in this
restraints, refer to Terminology D6799.
standard.
3.1.1 The following terms are relevant to this standard:
1.4 This standard does not purport to address all of the
edgecombing, inflatable restraint, seam slippage, yarn slippage
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.2 For all other terms related to textiles, see Terminology
priate safety, health, and environmental practices and deter- D123.
mine the applicability of regulatory limitations prior to use.
3.3 Definitions:
1.5 This international standard was developed in accor-
3.4 For definitions of other terms used in this standard, refer
dance with internationally recognized principles on standard-
to Terminology D123 and Terminology D6799.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- 4. Summary of Test Method
mendations issued by the World Trade Organization Technical
4.1 One end of a test specimen is clamped within one jaw of
Barriers to Trade (TBT) Committee.
a CRE tensile testing machine and a special fixture pierces a
row of equally spaced needle holes through the opposite end of
2. Referenced Documents
the specimen. In accordance withTest Method D5035, a tensile
2.1 ASTM Standards:
force is applied to the specimen until rupture occurs. The
D1776 Practice for Conditioning and Testing Textiles
measurement of the force required to cause rupture is the
D123 Terminology Relating to Textiles
measurement of edgecomb resistance.
D2904 Practice for Interlaboratory Testing of a Textile Test
5. Significance and Use
Method that Produces Normally Distributed Data (With-
drawn 2008)
5.1 A measurement of a fabric’s edgecomb resistance indi-
D2906 Practice for Statements on Precision and Bias for
cates the relative tendency of a fabric to pull apart under seam
stress or similar action. The related concepts of yarn slippage
and seam slippage are limited to sewn seams, whereas the
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
measurement of edgecomb resistance is made at the edge of a
and are the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
cut part in the absence of a sewn seam. The absence of a sewn
Current edition approved Feb. 15, 2020. Published March 2020. Originally
approved in 1999. Last previous edition approved in 2015 as D6479 – 15. DOI:
seam in this test method eliminates the effect that a particular
10.1520/D6479-15R20.
stitch might have on the tendency of a yarn to slip near an edge
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
of a cut part
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
5.2 This test method is useful for material design evalua-
the ASTM website.
tions in such applications as airbags in which seam stress is a
The last approved version of this historical standard is referenced on
www.astm.org. major concern.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6479 − 15 (2020)
5.3 This method may be used as a complement to Test 6.5 For inflatable restraints, all test equipment used in
Method D5822. accordance with this test method shall be certified for calibra-
tion annually by an independent agency or equipment manu-
6. Apparatus
facturer whose results are traceable to National Institute of
Science and Technology (NIST) or other national standards
6.1 Tensile Testing Machine—A constant-rate-of-extension
laboratory.The test parameters of the equipment shall be tested
(CRE) type, that is designed for the tensile forces anticipated,
within the operating ranges covered in the cushion specifica-
that is operated at a rate of 200 6 10 mm/min, that has a force
tion or equivalent document.
range selected such that the anticipated break occurs between
10 and 90 % of full scale load, and that has jaws and grip faces
7. Sampling and Specimen Preparation
as agreed upon by purchaser and supplier.
7.1 Edgecomb resistance testing is a destructive test. If used
6.2 Clamps, jaws with smooth, flat, parallel faces a mini-
in conjunction with lot testing, sampling is required.
mum of 60 mm wide by 25 mm tall. The jaws may be padded
7.2 For acceptance testing the lot size is the number of rolls
or coated under the jaw face area and should be mounted in the
of fabric produced in one production day, or as specified in the
upper position in the tensile testing machine.
applicable material specification.
6.3 Fixture, compatible with tensile tester, equipped with
7.3 From the end of each roll of fabric taken from the lot
twelve equally spaced 1 mm diameter pins with sharp points, 8
sample, cuta1m long, full width sample of fabric.
mm in length and corresponding 1.5 mm diameter holes with a
stop located 5 mm from the center of the holes (Fig. 1). The 7.4 From the laboratory sample, select five test specimens
fixture should be properly centered with the upper clamps and each from the warp and fill directions (Fig. 2).
their surfaces should be aligned (not twisted).
7.5 Specimen Cut:
6.4 Load Cell, whose rated capacity is between 110 and
7.5.1 Cut Edge Method:
1000 % of expected stripping load. A2000 N load cell is 7.5.1.1 Without sealing or unraveling the edges, cut each
generally used for inflatable restraints.
specimen 50 6 1 mm wide and 300 6 5 mm long, with the
FIG. 1 Fixture
D6479 − 15 (2020)
FIG. 2 Test Specimens
long dimension parallel to the warp yarns for a warp-oriented 9.2 Set the gage length between the bottom edge of the
test, and parallel to the fill yarns for a fill-oriented test. upper clamp to the top surface of the edge comb fixture to 200
7.5.2 Ravel Edge Method:
6 1 mm.
7.5.2.1 Cut each specimen 60 6 1 mm wide and 300 6 5
9.3 Select the force range of the testing machine for the
mm long, with the long dimension parallel to the warp yarns
break to occur between 10 and 90 % of full-scale force.
for a warp-oriented test, and pa
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