ASTM D6478-00
(Test Method)Standard Test Method for Determining Specific Packability of Fabrics Used in Inflatable Restraints
Standard Test Method for Determining Specific Packability of Fabrics Used in Inflatable Restraints
SCOPE
1.1 This test method covers procedures for determining the ability to fold and pack fabrics used for inflatable restraints using an index of specific packability.
1.2 Procedures in this test method describe operator techniques that must be followed closely to obtain repeatable and accurate results. Since these techniques are difficult to convey in writing, supplemental training for operators is required. A training video is available from ASTM.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system must be used independent of the other.
1.4 Procedures and apparatus other than those stated in this practice may be used as agreed upon between the purchaser and the supplier with specific deviations from this practice acknowledged in the report.
1.5 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
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Standards Content (Sample)
Designation: D 6478 – 00
Standard Test Method for
Determining Specific Packability of Fabrics Used in
1
Inflatable Restraints
This standard is issued under the fixed designation D 6478; 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 signed to cushion an occupant or equipment during collision;
airbag.
1.1 This test method covers procedures for determining the
3.1.2 packability, n— for inflatable restraints, the com-
ability to fold and pack fabrics used for inflatable restraints
pressibility of a folded airbag cushion relative to the space
using an index of specific packability.
available in an airbag module.
1.2 Procedures in this test method describe operator tech-
3.1.3 specific packability, n— for inflatable restraints, volu-
niques that must be followed closely to obtain repeatable and
metric index of compressibility for a folded fabric specimen
accurate results. Since these techniques are difficult to convey
measured at specified levels of compression.
in writing, supplemental training for operators is required. A
3.1.4 For definitions of other textile and statistical terms
training video is available from ASTM.
used in this test method, refer to Terminology D 123 and
1.3 The values stated in either SI units or inch-pound units
Practice D 2906.
are to be regarded separately as standard. The values stated in
each system are not exact equivalents; therefore, each system
4. Summary of Practice
must be used independent of the other.
4.1 A fabric specimen is folded uniformly in a “Z” pattern in
1.4 Procedures and apparatus other than those stated in this
the warp and fill directions.
practice may be used as agreed upon between the purchaser
4.2 The folded specimen is placed into a transparent box
and the supplier with specific deviations from this practice
that confines the specimen securely during compression.
acknowledged in the report.
4.3 The folded specimen is compressed using a tensile tester
1.5 This standard does not purport to address all of the
outfitted with special hardware, and the resulting volume is
safety concerns, if any, associated with its use. It is the
recorded at specified loads. The total of all the individual
responsibility of the user of this standard to establish appro-
volumes recorded at each specified cell is the specific pack-
priate safety and health practices, and determine the applica-
ability of the fabric.
bility of regulatory limitations prior to use.
5. Significance and Use
2. Referenced Documents
5.1 This test method is useful for determining the specific
2.1 ASTM Standards:
2 packability of uncoated and coated airbag fabrics. Fabric
D 1776 Practice for Conditioning Textiles for Testing
2 packability is an important factor in the design of airbag
D 123 Terminology Relating to Textiles
modules due to their inherent spacial contraints.
D 2904 Practice for Interlaboratory Testing of a Textile Test
2 5.2 A folded specimen exhibits better specific packability if
Method that Produces Normally Distributed Data
it occupies a lower total volume at the specified loads com-
D 2906 Practice for Statements of Precision and Bias for
2 pared to another specimen.
Textiles
5.3 The time required to test one sample (four specimens
E 691 Practice for Conducting an Interlaboratory Study to
3 from the same lot of fabric) is approximately 1.5 h using this
Determine the Precision of a Test Method
test method. Due to the length of time required by this test
3. Terminology method to perform a single test, this test method is most
suitable for use in design and development analysis or for
3.1 Definitions:
inclusion in a list of required tests conducted for annual
3.1.1 inflatable restraint, n—a vehicular safety device de-
certification of an airbag fabric.
1
This test method is under the jurisdiction of ASTM Committee D13 on Textiles
6. Apparatus
and is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
6.1 Tensile Tester, outfitted with a rigid base to support the
Current edition approved March 10, 2000. Published July 2000. Originally
published as D 6478–99. Last previous edition D 6478–99 specimen box, and a compression foot attached to the load cell
2
Annual Book of ASTM Standards, Vol 07.01.
with a coupling having adjustment and locking capability to
3
Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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D 6478
maintain fixed parallel alignment to the base. Tensile tester 8.1.1 Set tensile tester for compression mode, install load
should be calibrated annually by an independent agency whose cell with maximum force rating of 200 to 1000N, set crosshead
results are traceable to the National Institut
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