ASTM D6478-02

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 6478 – 02
Standard Test Method for
Determining Specific Packability of Fabrics Used in
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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.
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1. Scope ADJD6478 — 17 Detailed Drawings
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ADJD6478A- Videotape-Supplemental Training
1.1 This test method covers procedures for determining the
ability to fold and pack fabrics used for inflatable restraints
3. Terminology
using an index of specific packability.
3.1 Definitions:
1.2 Procedures in this test method describe operator tech-
3.1.1 For definitions of other textile and statistical terms
niques that must be followed closely to obtain repeatable and
used in this standard, refer to Terminology D 123, Practice
accurate results. Since these techniques are difficult to convey
D 2906 and Terminology D 6799.
in writing, supplemental training for operators is required. A
training video is available from ASTM.
4. Summary of Practice
1.3 The values stated in either SI units or inch-pound units
4.1 Afabricspecimenisfoldeduniformlyina“Z”patternin
are to be regarded separately as standard. The values stated in
the warp and fill directions.
each system are not exact equivalents; therefore, each system
4.2 The folded specimen is placed into a transparent box
must be used independent of the other.
that confines the specimen securely during compression.
1.4 Procedures and apparatus other than those stated in this
4.3 Thefoldedspecimeniscompressedusingatensiletester
practice may be used as agreed upon between the purchaser
outfitted with special hardware, and the resulting volume is
and the supplier with specific deviations from this practice
recorded at specified loads. The total of all the individual
acknowledged in the report.
volumes recorded at each specified cell is the specific pack-
1.5 This standard does not purport to address all of the
ability of the fabric.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Significance and Use
priate safety and health practices, and determine the applica-
5.1 This test method is useful for determining the specific
bility of regulatory limitations prior to use.
packability of uncoated and coated airbag fabrics. Fabric
packability is an important factor in the design of airbag
2. Referenced Documents
modules due to their inherent spacial contraints.
2.1 ASTM Standards:
5.2 Afolded specimen exhibits better specific packability if
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D 1776 Practice for Conditioning Textiles for Testing
2 it occupies a lower total volume at the specified loads com-
D 123 Terminology Relating to Textiles
pared to another specimen.
D 2904 Practice for Interlaboratory Testing of a Textile Test
2 5.3 The time required to test one sample (four specimens
Method that Produces Normally Distributed Data
from the same lot of fabric) is approximately 1.5 h using this
D 2906 Practice for Statements of Precision and Bias for
2 test method. Due to the length of time required by this test
Textiles
method to perform a single test, this test method is most
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D 6799 Terminology Relating to Inflatable Restraints
suitable for use in design and development analysis or for
E 691 Practice for Conducting an Interlaboratory Study to
4 inclusion in a list of required tests conducted for annual
Determine the Precision of a Test Method
certification of an airbag fabric.
2.2 ASTM Adjuncts:
6. Apparatus
6.1 Tensile Tester, outfitted with a rigid base to support the
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specimen box, and a compression foot attached to the load cell
This test method is under the jurisdiction ofASTM Committee D13 onTextiles
and is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
Current edition approved April 10, 2002. Published July June 2002. Originally
published as D 6478–99. Last previous edition D 6478–00
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Annual Book of ASTM Standards, Vol 07.01. Available from ASTM International Headquarters. For 17 Detailed CAD
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Annual Book of ASTM Standards, Vol 07.02. Drawings, Order Adjunct No. ADJD6478. For Videotape-Supplemental Training,
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Annual Book of ASTM Standards, Vol 14.02. Order ADJD6478A.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D6478–02
with a coupling having adjustment and locking capability to record thickness with an accuracy of 0.1 mm at loads of 20 to
maintain fixed parallel alignment to the base. Tensile tester 180N in 20N increments (nine total points), set sampling
shoul
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