ASTM D5645-95A

Standard Test Methods for Determining Physical Properties of Inflatable Restraint Cushions (Withdrawn 1999)

SCOPE
1.1 These test methods cover the procedures used to evaluate the physical properties of driver-side and passenger-side inflatable restraint cushions.  
1.2 The physical properties included by these test methods are seam strength, resistance to internal pressures greater than deployment pressures, and the leak rate of inflation gases at less than intended inflation pressures.  
1.2.1 For ease of reference, the Summary of Test Method, Scope, Apparatus, Sampling, Procedure, and Precision and Bias sections are listed separately for each of the three physical properties of these test methods:  Property Section Seam Strength 9 Cushion Overpressurization 10 Leak Rate 11
1.3 Procedures and apparatus other than those stated in these test methods may be used by agreement between the purchaser and the supplier with the specific deviations from the standard acknowledged in the report.  
1.4 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.  
1.5 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. Specific precautionary statements are given in Section 6.

General Information

• Status: Withdrawn
• Publication Date: 31-Dec-1994
• ICS: 43.040.80 - Crash protection and restraint systems
• Technical Committee: D13 - Textiles
• Drafting Committee: D13.20 - Inflatable Restraints

Standards Content (Sample)

ASTM D5b45 REVxA 95 m 0759510 0569679 q2l, m
AMERICAN SOCIETY FOR TESTING AND MATERIALS
1316 Race St. Philadelphia, Pa 19103
Designation: D 5645 - 95a
Reprinted from the Annual Book of ASTM Standards. Copyright AS,?
ClsTb
If not i,$ted I” the current combined Index. &VIII appear in the next eddon.
Standard Test Methods for
Determining Physical Properties of Inflatable Restraint
Cushions’
This standard is issued under the tixed designation D 5645; 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 (t) indicates an editorial change since the last revision or reapproval.
straints, the process of overinflating a cushion at internal
1. Scope
pressures greater than design deployment pressures; bag burst.
1. I These test methods cover the procedures used to
3.1.3 deployment, n-for inflatable restraints, the se-
evaluate the physical properties of driver-side and passenger-
quence of events related to the activation of a module.
side inflatable restraint cushions.
3.1.4 inflatable restraint, n-a vehicular safety device
1.2 The physical properties included by these test methods
designed to cushion an occupant or equipment during
are seam strength, resistance to internal pressures greater
collision; airbag.
than deployment pressures, and the leak rate of inflation
3.1.5 inflator, n-for inflatable restraints, a device for
I gases at less than intended inflation pressures.
generating and directing expansion gases into a cushion.
1.2.1 For ease of reference, the Summary of Test Method,
3.1.6 leak rate, n-for inflatable restraints, the steady-
Scope, Apparatus, Sampling, Procedure, and Precision and
state rate of flow of an inflation gas through the entire
Bias sections are listed separately for each of the three
cushion surface area at less than intended deployment
physical properties of these test methods:
pressures.
Section
Property
3.1.7 module, n-for inflatable restraints, an assembly
Scam Strength 9
composed of an inflator, a cushion, a mounting device, a
Cushion Overpressurization IO
trigger, and a cover.
Leak Rate II
3.1.8 standard atmosphere for testing textiles, n-an at-
1.3 Procedures and apparatus other than those stated in
mosphere for testing in which the air is maintained at a
these test methods may be used by agreement between the
relative humidity of 65 & 2 % and at a temperature of
purchaser and the supplier with the specific deviations from
21 + 1°C (70 + 2°F).
the standard acknowledged in the report.
3.1.9 For definitions of other textile terms used in these
1.4 The values stated in either SI units or inch-pound
test methods refer to Terminology D 123.
units are to be regarded separately as standard. The values
stated in each system are not exact equivalents; therefore,
4. Significance and Use
each system must be used independent of the other.
4. I Seam strength testing isused for design validation and
1.5 This standard does not purport to address all of the
in conjunction with lot acceptance.
sufety concerns, if any, associated with its use. It is the
4.2 Cushion over-pressurization testing may be used in
responsibility of the user of this standard to establish appro-
conjunction with design and production validation, manu-
priate safety and health practices and determine the applica-
facturing process control, lot acceptance, or a combination
bility of regulatory limitations prior to use. Specific precau-
thereof.
tionary statements are given in Section 6.
4.2.1 Sources of variation in Cushion overpressurization
testing procedures include orifice size, attachment fixture,
2. Referenced Documents
method of attachment, presence or absence of internal
2.1 ASTM Standards: bladder, accumulator size and pressure, transducer type and
D 123 Terminology Relating to Textiles2
location, and presence or absence of vent plugs. All sources
D 1683 Test Method for Failure in Sewn Seams of Woven
of setup variation should be addressed in the applicable part
Fabrics2
specification,
4.2.2 In accordance with the applicable specification,
cushions may be pressurized without bursting to determine
3. Terminology
their resistance to a fixed level of high internal pressure, or
3.1 Definitions:
they may be subjected to increasing pressures to determine
3.1.1 cushion, n-fur inflatable restruints, the inflatable
their ultimate bursting strength.
fabric envelope portion of a module.
4.3 Leak rate testing may be used in conjunction with
3.1.2 cushion overpressurization, n-for inflatable re-
design and production validation manufacturing process
control, lot acceptance, or a combination thereof.
4.3.1 Leak rate testing is performed to detect large holes
t These test methods are under the jurisdiction of ASTM Committee D-l 3 on
Texttles and are the direct re
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