ASTM D6478-08
(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
SIGNIFICANCE AND USE
This test method is useful for determining the specific packability of uncoated and coated airbag fabrics. Fabric packability is an important factor in the design of airbag modules due to their inherent spacial contraints.
A folded specimen exhibits better specific packability if it occupies a lower total volume at the specified loads compared to another specimen.
The time required to test one sample (four specimens from the same lot of fabric) is approximately 1.5 h using this test method. Due to the length of time required by this test method to perform a single test, this test method is most suitable for use in design and development analysis or for inclusion in a list of required tests conducted for annual certification of an airbag fabric.
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 (see Adjuncts ADJD6478 and ADJD6478A and ).
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.
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Designation: D 6478 – 08
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope Determine the Precision of a Test Method
2.2 ASTM Adjuncts:
1.1 This test method covers procedures for determining the
4
ADJD6478 — 17 Detailed Drawings
ability to fold and pack fabrics used for inflatable restraints
4
ADJD6478A- Videotape-Supplemental Training
using an index of specific packability.
1.2 Procedures in this test method describe operator tech-
3. Terminology
niques that must be followed closely to obtain repeatable and
3.1 For all terminology relating to D13.20, Inflatable re-
accurate results. Since these techniques are difficult to convey
straints, refer to Terminology D 6799.
in writing, supplemental training for operators is required. A
3.1.1 The following terms are relevant to this standard:
training video is available from ASTM (see Adjuncts
inflatable restraint, packability, specific packability.
ADJD6478 and ADJD6478A).
3.2 For all other terms related to textiles, see Terminology
1.3 The values stated in either SI units or inch-pound units
D 123.
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 Afabricspecimenisfoldeduniformlyina“Z”patternin
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 Thefoldedspecimeniscompressedusingatensiletester
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
2.1 ASTM Standards:
packability of uncoated and coated airbag fabrics. Fabric
D 123 Terminology Relating to Textiles
packability is an important factor in the design of airbag
D 1776 Practice for Conditioning and Testing Textiles
modules due to their inherent spacial contraints.
D 2904 Practice for InterlaboratoryTesting of aTextileTest
5.2 Afolded 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 on Precision and Bias for
pared to another specimen.
3
Textiles
5.3 The time required to test one sample (four specimens
D 6799 Terminology Relating to Inflatable Restraints
from the same lot of fabric) is approximately 1.5 h using this
E 691 Practice for Conducting an Interlaboratory Study to
test method. Due to the length of time required by this test
method to perform a single test, this test method is most
suitable for use in design and development analysis or for
1
This test method is under the jurisdiction ofASTM Committee D13 onTextiles
inclusion in a list of required tests conducted for annual
and is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
Current edition approved July 1, 2008. Published July 2008. Originally approved certification of an airbag fabric.
in 1999. Last previous edition in 2007 as D 6478–02(2007)
2
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
4
Standards volume information, refer to the standard’s Document Summary page on Available from ASTM International Headquarters. For 17 Detailed CAD
the ASTM website. Drawings, Order Adjunct No. ADJD6478. For Videotape-Supplemental Training,
3
Withdrawn. Order ADJD6478A.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D6478–08
6. Apparatus speed to 25.0 6 1.0 mm/min, set data acquisition equipment to
record thickness with an accuracy of 0.1
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D6478–02 (Reapproved 2007) Designation: D 6478 – 08
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 (´) indicates an editorial change since the last revision or reapproval.
1. 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 (see Adjuncts ADJD6478 and ADJD6478A and ).
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D 123 Terminology Relating to Textiles
D 1776 Practice for Conditioning and Testing Textiles
D 2904 Practice for Interlaboratory Testing of a Textile Test Method that Produces Normally Distributed Data
D 2906 Practice for Statements on Precision and Bias for Textiles
D 6799 Terminology Relating to Inflatable Restraints
E 691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
2.2 ASTM Adjuncts:
3
ADJD6478 — 17 Detailed Drawings
3
ADJD6478A- Videotape-Supplemental Training
3. Terminology
3.1Definitions:
3.1.1For definitions of other textile and statistical terms used in this standard, refer to Terminology D123, Practice D2906 and
Terminology D6799.
3.1 For all terminology relating to D13.20, Inflatable restraints, refer to Terminology D 6799.
3.1.1 The following terms are relevant to this standard: inflatable restraint, packability, specific packability.
3.2 For all other terms related to textiles, see Terminology D 123.
4. Summary of Practice
4.1 A fabric specimen is folded uniformly in a “Z” pattern in the warp and fill directions.
4.2 The folded specimen is placed into a transparent box that confines the specimen securely during compression.
4.3 The folded specimen is compressed using a tensile tester outfitted with special hardware, and the resulting volume is
1
This test method is under the jurisdiction of ASTM Committee D13 on Textiles and is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints .
Current edition approved July 1, 2007.2008. Published August 2007.July 2008. Originally approved in 1999. Last previous edition in 20022007 as D 6478–02(2007)
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from ASTM International Headquarters. For 17 Detailed CAD Drawings, Order Adjunct No. ADJD6478. For Videotape-Supplemental Training, Order
ADJD6478A.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D6478–08
recorded at specified loads. The total of all the individual volumes recorded at each specified cell is the specific packability of the
fabric.
5. Significance and Use
5.1 This test method is useful for determining the specific packability of uncoated and coated airbag fabrics. Fabric packability
is an important factor in the design of airbag modules due to their inherent spacial contraints.
5.2 A folded specimen exhibits better specific packability if it occupies a lower total volume at the specified loads compared
to another specimen.
5.3 T
...
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