ASTM D5822-03

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Designation: D 5822 – 03
Standard Test Method for
Determining Seam Strength in Inflatable Restraint
1
Cushions
This standard is issued under the fixed designation D 5822; 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 3990 Terminology Relating to Inflatable Restraints
1.1 This test method covers the measurement of seam
3. Terminology
efficiency and the maximum seam strength in inflatable re-
3.1 Definitions:
straint cushions composed of woven fabrics when a force is
3.1.1 seam effıciency, n—in inflatable restraints, the ratio of
applied perpendicular to the seam, using a grab test. For
seam strength to fabric strength.
evaluating sewing thread, refer to Test Method D 204.
3.1.2 seam failure, n—in inflatable restraints, the point at
1.2 This test method is restricted to seams that are obtained
which an external force ruptures a seam assembly or the fabric,
from an inflatable restraint cushion. Seams may include but are
or causes excessive yarn slippage adjacent to the seam assem-
not limited to sewn, OPW, glued, fused (chemically or ther-
bly.
mally).
3.1.3 seam strength, n—in inflatable restraints, the maxi-
1.3 This test method is used when the measurement of a
mum force required to create a seam failure.
resistance to a specified force, a breaking force, a minimum
3.2 For definitions of textile terms relating to inflatable
elongation, or a combination thereof are required to determine
restraints used in this standard, refer to Terminology D 3990.
the seam strength, or seam integrity of a particular fabric for
3.3 For definitions of other textile terms used in this
inflatable restraint use.
standard, refer to Terminology D 123.
1.4 Procedures and apparatus other than those stated in this
standard may be used by agreement between purchaser and
4. Summary of Test Method
supplier with the specific deviations from the standard ac-
4.1 Specimens with and without seam assemblies taken
knowledged in the report.
from inflatable restraint cushions are destructively tested in a
1.5 The values stated in either SI units or inch-pound units
tensile testing machine under laboratory conditions to deter-
are to be regarded separately as standard. The values stated in
mine seam strength and seam efficiency.
each system are not exact equivalents; therefore, each system
must be used independently of the other.
5. Significance and Use
1.6 This standard does not purport to address all of the
5.1 Seam strength testing is used for design validation and
safety concerns, if any, associated with its use. It is the
for lot acceptance.
responsibility of the user of this standard to establish appro-
5.2 This test method constitutes the conditions, procedures,
priate safety and health practices and determine the applica-
and equipment by which inflatable restraints are tested for
bility of regulatory limitations prior to use.
seam strength and seam efficiency. It is intended to be used as
a guideline in establishing a written part specification or print.
2. Referenced Documents
2 The specification or agreement of purchaser and supplier may
2.1 ASTM Standards:
deviate from the procedures described herein when (based on
D 123 Terminology Relating to Textiles
experience) considerations of equipment, cushion design, or
D 204 Test Methods for Sewing Threads
other factors dictate otherwise.
D 1776 Practice for Conditioning and Testing Textiles
5.3 In cases of dispute arising from differences in reported
test results when using this test method for acceptance testing
of commercial shipments, the purchaser and the supplier
1
This test method is under the jurisdiction ofASTM Committee D13 onTextiles
should perform comparative tests to determine if there is a
and is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
statistical bias between their laboratories. Competent statistical
Current edition approved April 10, 2003. Published November 2003. Originally
approved in 1995. Last previous edition approved in 2002 as D 5822 – 02.
assistance is recommended for the investigation of bias. As a
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
minimum, the two parties should take a group of test speci-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
mens from the same lot of fabric to be evaluated, which utilize
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. a like seam assembly (or standard seam assembly) to achieve
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