ASTM D6478-10
(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 constraints.
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).
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 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:D6478 −10
StandardTest Method for
Determining Specific Packability of Fabrics Used in
1
Inflatable Restraints
This standard is issued under the fixed designation D6478; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E691Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.1 This test method covers procedures for determining the
2.2 ASTM Adjuncts:
ability to fold and pack fabrics used for inflatable restraints
4
ADJD6478 — 17 Detailed Drawings
using an index of specific packability.
4
ADJD6478A — Videotape-Supplemental Training
1.2 Procedures in this test method describe operator tech-
niques that must be followed closely to obtain repeatable and
3. Terminology
accurate results. Since these techniques are difficult to convey
3.1 For all terminology relating to D13.20, Inflatable
in writing, supplemental training for operators is required. A
restraints, refer to Terminology D6799.
training video is available from ASTM (see Adjuncts
3.1.1 The following terms are relevant to this standard:
ADJD6478 and ADJD6478A).
inflatable restraint, packability, specific packability.
1.3 The values stated in SI units are to be regarded as
3.2 For all other terms related to textiles, see Terminology
standard. No other units of measurement are included in this
D123.
standard.
4. Summary of Test Method
1.4 Procedures and apparatus other than those stated in this
practice may be used as agreed upon between the purchaser
4.1 Afabricspecimenisfoldeduniformlyina“Z”patternin
and the supplier with specific deviations from this practice
the warp and fill directions.
acknowledged in the report.
4.2 The folded specimen is placed into a transparent box
1.5 This standard does not purport to address all of the
that confines the specimen securely during compression.
safety concerns, if any, associated with its use. It is the
4.3 Thefoldedspecimeniscompressedusingatensiletester
responsibility of the user of this standard to establish appro-
outfitted with special hardware, and the resulting volume is
priate safety and health practices, and determine the applica-
recorded at specified loads. The total of all the individual
bility of regulatory limitations prior to use.
volumes recorded at each specified cell is the specific pack-
ability of the fabric.
2. Referenced Documents
2
2.1 ASTM Standards:
5. Significance and Use
D123Terminology Relating to Textiles
5.1 This test method is useful for determining the specific
D1776Practice for Conditioning and Testing Textiles
packability of uncoated and coated airbag fabrics. Fabric
D2904Practice for Interlaboratory Testing of a Textile Test
packability is an important factor in the design of airbag
Method that Produces Normally Distributed Data (With-
modules due to their inherent spacial constraints.
3
drawn 2008)
5.2 Afolded specimen exhibits better specific packability if
D6799Terminology Relating to Inflatable Restraints
it occupies a lower total volume at the specified loads com-
pared to another specimen.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD13onTextiles
and is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
5.3 The time required to test one sample (four specimens
Current edition approved June 1, 2010. Published August 2010. Originally
from the same lot of fabric) is approximately 1.5 h using this
approved in 1999. Last previous edition approved in 2009 as D6478–09. DOI:
test method. Due to the length of time required by this test
10.1520/D6478-10.
2
method to perform a single test, this test method is most
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
Standards volume information, refer to the standard’s Document Summary page on
4
the ASTM website. Available from ASTM International Headquarters. For 17 Detailed CAD
3
The last approved version of this historical standard is referenced on Drawings, Order Adjunct No. ADJD6478. For Videotape-Supplemental Training,
www.astm.org. Order ADJD6478A.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6478−10
suitable for use in design and development analysis or for 8. Procedure
inclusion in a list of required tests conducted for annual
8.1 Tensile Tester Set-Up and Calibration Check:
certification of an airbag fabric.
(See X1.1.)
8.1.1 Set tensile tester for compression mode, install load
6. Apparatus
cellwithmaximumforceratingof200to1000
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:D6478–09 Designation: D6478 – 10
Standard Test Method for
Determining Specific Packability of Fabrics Used in
1
Inflatable Restraints
This standard is issued under the fixed designation D6478; 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 ADJD64782.2and ADJD6478A).
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 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:
D123 Terminology Relating to Textiles
D1776 Practice for Conditioning and Testing Textiles
D2904 Practice for Interlaboratory Testing of a Textile Test Method that Produces Normally Distributed Data
D6799 Terminology Relating to Inflatable Restraints
E691 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
ADJD6478A — Videotape-Supplemental Training
3. Terminology
3.1 For all terminology relating to D13.20, Inflatable restraints, refer to Terminology D6799.
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 D123.
4. Summary of Test Method
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
recorded at specified loads. The total of all the individual volumes recorded at each specified cell is the specific packability of the
fabric.
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 JulyJune 1, 2009.2010. Published August 2009.2010. Originally approved in 1999. Last previous edition approved in 20082009 as
D6478–08D6478–09. DOI: 10.1520/D6478-109.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
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 – 10
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 constraints.
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 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 an
...
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