Name: ASTM D5807-95 - Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions
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Abstract

Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions

SCOPE
1.1 This practice covers the procedures and conditions used to evaluate the physical performance of inflatable restraint cushions during and after overpressurization testing at elevated pressures capable of causing cushion bursting using air pressurization equipment.
1.2 The physical performance characteristics that may be obtained in conjunction with this practice are internal cushion pressures determined by instrumentation and material integrity, determined by visual inspection.
1.3 This practice is applicable to driver-side inflatable restraint cushions only.
1.4 Procedures and apparatus other than those stated in this practice may be used by agreement between purchaser and supplier with the specific deviations from this practice acknowledged in the report.
1.5 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 independently of the other.
1.6 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. See Section 9 for specific hazard information.

General Information

Status

Historical

Publication Date

31-Dec-1994

ICS

43.040.80 - Crash protection and restraint systems

Technical Committee

D13 - Textiles

Drafting Committee

D13.20 - Inflatable Restraints

Current Stage

Ref Project

Relations

Replaced By

ASTM D5807-02 - Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions

Effective Date

10-Apr-2002

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ASTM D5807-95 - Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions

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ASTM D5807-95 - Standard Pract...

Designation: D 5807 – 95
Standard Practice for
Evaluating the Overpressurization Characteristics of
1
Inﬂatable Restraint Cushions
This standard is issued under the ﬁxed designation D 5807; 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 3.1.4 inﬂatable restraint, n—a vehicular safety device de-
signed to cushion an occupant or equipment during collision;
1.1 This practice covers the procedures and conditions used
airbag.
to evaluate the physical performance of inﬂatable restraint
3.1.5 module, n—for inﬂatable restraints, an assembly com-
cushions during and after overpressurization testing at elevated
posed of an inﬂator, a cushion, a mounting device, a trigger,
pressures capable of causing cushion bursting using air pres-
and a cover.
surization equipment.
3.1.6 standard atmosphere for testing textiles, n—an atmo-
1.2 The physical performance characteristics that may be
sphere for testing in which the air is maintained at a relative
obtained in conjunction with this practice are internal cushion
humidity of 65 6 2 % and at a temperature of 21 6 1°C (70 6
pressures determined by instrumentation and material integrity,
2°F).
determined by visual inspection.
3.2 For deﬁnitions of other textile terms used in this
1.3 This practice is applicable to driver-side inﬂatable
standard, refer to Terminology D 123.
restraint cushions only.
1.4 Procedures and apparatus other than those stated in this
4. Summary of Practice
practice may be used by agreement between purchaser and
4.1 Inﬂatable restraint cushions are tested under laboratory
supplier with the speciﬁc deviations from this practice ac-
conditions to evaluate cushion integrity when exposed to
knowledged in the report.
internal cushion pressures greater than deployment pressures.
1.5 The values stated in either SI units or inch-pound units
If cushion rupture occurs, the rupture pressure, time to rupture,
are to be regarded separately as standard. The values stated in
and mode of rupture are recorded.
each system are not exact equivalents; therefore, each system
4.2 Inﬂatable restraint cushions are mounted into a test
must be used independently of the other.
stand that allows for deployments under conditions that exceed
1.6 This standard does not purport to address all of the
deployment pressures. Instrumentation within the test stand
safety concerns, if any, associated with its use. It is the
charts inﬂation pressures versus time and may allow for
responsibility of the user of this standard to establish appro-
photographic review of the overpressurization sequence.
priate safety and health practices and determine the applica-
4.3 Cushion overpressurization results are reviewed for
bility of regulatory limitations prior to use. See Section 8 for
pressure and time relationships, and post-inﬂation material
speciﬁc hazard information.
analysis.
2. Referenced Documents
5. Signiﬁcance and Use
2.1 ASTM Standards:
2 5.1 This practice is intended to be a general guideline for
D 123 Terminology Relating to Textiles
repetitive testing, safe conduct of tests, and accurate data
3. Terminology collection for inﬂatable restraints. Cushion overpressurization
testing may be used for design and production validation, for
3.1 Deﬁnitions:
manufacturing process control, for lot acceptance, or for a
3.1.1 cushion, n—for inﬂatable restraints, the inﬂatable
combination thereof.
fabric envelope portion of a module.
5.2 This practice constitutes the conditions, apparatus, and
3.1.2 cushion overpressurization, n—for inﬂatable re-
procedures by which driver-side inﬂatable restraints are com-
straints, the process of inﬂating a cushion at internal pressures
monly tested for cushion overpressurization. It is intended to
greater than design deployment pressures; bag burst.
be used as a guideline in establishing a cushion speciﬁcation or
3.1.3 deployment, n—for inﬂatable restraints, the sequence
equivalent document. The practices in the speciﬁcation may
of events related to the activation of a module.
deviate from the practices described herein when (based on
1 experience) considerations of equipment, cushion design, or
This practice is under the jurisdiction of ASTM Committee D-13 on Textiles
other factors dictate otherwise.
and is the direct responsibility of Subcommittee D13.20 on Inﬂatable Restraints.
Current edition approved Sept. 10, 1995. Published February 1996.
5.3 There exists a large variety in cushion conﬁgurations
2
Annual Book of ASTM Standards, Vol 07.01.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D 5807
and equipment designs, obviating a standard test method for inﬂation and for communicating with the data acqu
...

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5.1 This test method may be used for product development and design, production validation, manufacturing process control, lot acceptance, or for a combination thereof.
5.2 The rate of inflation in this method does not attempt to mimic that of an actual cushion deployment, nor is it intended to subject the cushion to the dynamic loads, stress, and temperatures during such an event. It is also recognized that the compressed air used for this tests may not leak through the cushion at the same rate as the gas or mixture of gasses typically used in cushion inflators. Rather this method is intended to give a relative indication of the pressure holding ability of the cushion.
5.3 The internal volume and internal design of cushions varies greatly. This test method is most useful when comparing data from cushions of the same design and volume. This test method does not provide any data concerning the volume of gas leaking from the bag. At certain higher levels of the initial internal pressure, this test method will irreversibly damage the cushion and change its leakage properties for future testing or for commercial use. The damage to the bag is dependent on the design or shape of a specific bag and the type of coating applied. It is the responsibility of the supplier and/or purchaser to determine if the parameters under which a cushion is tested will be destructive and render the cushion unfit for future use
5.4 Within the limits of variance expressed in Section 12, this test method is useful for design and production validation and may be suitable for incorporation in a cushion specification or for lot acceptance testing of commercial shipments.
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1.1 This test method is intended to determine the ability of an inflatable restraint cushion to retain air pressure at elevated pressures for a specified time interval.
1.2 Procedures and apparatus other than those stated in this test method may be used by agreement of purchaser and supplier, provided the specific deviations from the standard acknowledged in the report.
1.3 The results of this test method should not be used to predict the actual internal pressure decay of a cushion during a deployment.
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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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Standard Practice for Evaluating the Performance of Inflatable Restraint Modules

SIGNIFICANCE AND USE
5.1 This practice is intended to be a general guideline for repetitive testing, safe conduct of tests, and accurate data collection for inflatable restraints.
5.2 This practice may be used by the purchaser and the supplier to establish the criteria by which inflatable restraint modules will be tested by the supplier to determine whether a lot of material is acceptable for shipment to the purchaser.
5.3 Unless otherwise specified by agreement between the purchaser and the supplier, this practice shall constitute the test conditions, procedures, and equipment by which inflatable restraint modules are deployed for testing. It is intended to be used as a guideline in establishing a written material specification or equivalent agreement between the purchaser and the supplier. The specification may deviate from the practices described herein when (based on experience) considerations of fabric properties, material handling equipment, or inflatable restraint system design dictate otherwise.
SCOPE
1.1 This practice describes the procedures and conditions used to evaluate the physical performance of inflatable restraint modules and module components during and after deployment.
1.2 The physical performance characteristics that may be obtained by this practice are internal cushion pressures determined by instrumentation, cushion geometries determined by high-speed photography, and material integrity determined by visual inspection.
1.3 This practice is applicable to driver and passenger side inflatable restraint modules.
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Standard Practice for Accelerated Aging of Inflatable Restraint Fabrics

SIGNIFICANCE AND USE
5.1 For inflatable restraints, practices for conducting accelerated aging are designed to determine the aggravated effects on a fabric from exposures to heat, humidity, or ozone, or a combination thereof. These environmental conditions may also be cycled in combination. The four accelerated aging procedures of concern to the design and manufacture of inflatable restraints are referred to as cycle aging, heat aging, humidity aging, and ozone aging.
5.2 The environmental conditions described in this practice are designed to allow restraints so that reliable comparisons may be made between different fabrics and different laboratories.
5.3 In order to achieve precise and reliable physical property comparisons of different fabrics, it is necessary to control accurately the humidity, temperature, ozone, and cycling conditions to which the fabric is subjected.
5.4 Fabric specimens are configured in accordance with the requirements of test methods to be conducted on the specimens subsequent to accelerated aging.
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1.1 This practice describes the procedures for the accelerated aging of inflatable restraint fabrics when required as a preparatory step for other test methods.
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SIGNIFICANCE AND USE
5.1 This practice is intended to be a general guideline for repetitive testing, safe conduct of tests, and accurate data collection for inflatable restraints. Cushion overpressurization testing may be used for design and production validation, for manufacturing process control, for lot acceptance, or for a combination thereof.
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5.2 However, there is a class of barriers such as some nets and fences that rely on a structurally repetitive interior system and strengthened end terminals or anchorages that are not explicitly treated under Test Method F2656/F2656M. There are situations where the interior system of the barrier could be exceptionally long and it is impractical or impossible to test the maximum-width configuration due to test facility site constraints, as an example.
5.3 When a variable-width barrier is dependent on a structurally repetitive interior system that could be exceptionally long and terminated with strengthened end terminals, this practice shall be used to establish the maximum-width configuration that is equivalent to an infinitely long barrier.
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1.6 This practice does not apply to continuous or other types of vehicle barriers.
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