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ASTM D5807-02

(Practice)

Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions

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 8 for specific hazard information.

General Information

Status
Historical
Publication Date
09-Apr-2002
ICS
43.040.80 - Crash protection and restraint systems
Technical Committee
D13 - Textiles
Drafting Committee
D13.20 - Inflatable Restraints
Current Stage
Ref Project

Relations

Replaces
ASTM D5807-95 - Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions
Effective Date
10-Apr-2002
Replaced By
ASTM D5807-02a - Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions
Effective Date
10-Sep-2002

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ASTM D5807-02 - Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint CushionsASTM D5807-02 - Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions
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ASTM D5807-02 - Standard Practice for Evaluating the Overpressurization Characteristics of Inflatable Restraint Cushions
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 5807 – 02
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 4. Summary of Practice
1.1 This practice covers the procedures and conditions used 4.1 Inflatable restraint cushions are tested under laboratory
to evaluate the physical performance of inflatable restraint conditions to evaluate cushion integrity when exposed to
cushions during and after overpressurization testing at elevated internal cushion pressures greater than deployment pressures.
pressures capable of causing cushion bursting using air pres- If cushion rupture occurs, the rupture pressure, time to rupture,
surization equipment. and mode of rupture are recorded.
1.2 The physical performance characteristics that may be 4.2 Inflatable restraint cushions are mounted into a test
obtained in conjunction with this practice are internal cushion stand that allows for deployments under conditions that exceed
pressures determined by instrumentation and material integrity, deployment pressures. Instrumentation within the test stand
determined by visual inspection. charts inflation pressures versus time and may allow for
1.3 This practice is applicable to driver-side inflatable photographic review of the overpressurization sequence.
restraint cushions only. 4.3 Cushion overpressurization results are reviewed for
1.4 Procedures and apparatus other than those stated in this pressure and time relationships, and post-inflation material
practice may be used by agreement between purchaser and analysis.
supplier with the specific deviations from this practice ac-
5. Significance and Use
knowledged in the report.
1.5 The values stated in either SI units or inch-pound units 5.1 This practice is intended to be a general guideline for
repetitive testing, safe conduct of tests, and accurate data
are to be regarded separately as standard. The values stated in
each system are not exact equivalents; therefore, each system collection for inflatable restraints. Cushion overpressurization
testing may be used for design and production validation, for
must be used independently of the other.
1.6 This standard does not purport to address all of the manufacturing process control, for lot acceptance, or for a
combination thereof.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 5.2 This practice constitutes the conditions, apparatus, and
procedures by which driver-side inflatable restraints are com-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. See Section 8 for monly tested for cushion overpressurization. It is intended to
specific hazard information. be used as a guideline in establishing a cushion specification or
equivalent document. The practices in the specification may
2. Referenced Documents
deviate from the practices described herein when (based on
2.1 ASTM Standards: experience) considerations of equipment, cushion design, or
2
D 123 Terminology Relating to Textiles other factors dictate otherwise.
3
D 6799 Terminology Relating to Inflatable Restraints 5.3 There exists a large variety in cushion configurations
and equipment designs, obviating a standard test method for
3. Terminology
cushion overpressurization. Therefore, a cushion specification
3.1 Definitions:
should incorporate the practices stated herein when describing
3.2 For definitions of other terms used in this standard, refer a test method for testing a specific cushion geometry and
to Terminology D 123 and Terminology D 6799.
apparatus design. To ensure accuracy and repeatability, the
specification should also address precision and bias in a
manner consistent with ASTM prescribed procedures and
1
This practice is under the jurisdiction of ASTM Committee D13 on Textiles and
consistent with the particular cushion geometry, equipment in
is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
use, and test procedures.
Current edition approved April 10, 2002. Published June 2002. Last previous
5.3.1 Sources of variation in cushion overpressurization
edition D 5807 - 95.
2
Annual Book of ASTM Standards, Vol 07.01.
testing procedures include orifice size, attachment fixture,
3
Annual Book of ASTM Standards, Vol 07.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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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.  
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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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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.  
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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.  
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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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SIGNIFICANCE AND USE
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1.1 This practice provides a procedure for applying Test Method F2656/F2656M test criteria to an exceptionally long (that is, 300 ft [91 m] or greater) variable-width vehicle barrier as defined by Test Method F2656/F2656M.  
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1.4 This practice applies only when it is impractical or impossible to install the maximum-width test article of a variable-width barrier because the test facility site constraints limit the practical length of the test article.  
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Standard Test Method for Determining Pressure Decay of Inflatable Restraint Cushions

SIGNIFICANCE AND USE
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  
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SCOPE
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.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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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.  
1.4 Procedures and apparatus other than those stated in this practice may be used by agreement between the purchaser and the supplier with the specific deviations from the 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 independent 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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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.  
5.5 Unless otherwise specified by agreement between the purchaser and the supplier, this practice shall constitute the conditions, procedures, and equipment by which inflatable restraint fabrics are conditioned and aged. It is intended to be used as a guideline in establishing a written material specification. The specification or agreement of the purchaser and the supplier 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 for the accelerated aging of inflatable restraint fabrics when required as a preparatory step for other test methods.  
1.1.1 In Section 7, this practice lists four methods for conducting accelerated aging that are of concern to the design and manufacture of inflatable restraints. They are as follows:    
Description  
Section  
Cycle aging (Option “A” or “B”)  
8.4  
Heat aging (Option “A” or “B”)  
8.4.3.1  
Humidity aging (Option “A” or “B”)  
8.7  
Ozone aging  
8.8  
1.2 This practice may be used in conjunction with other ASTM test methods when subsequent tests of physical properties are required of aged fabric specimens.  
1.3 Procedures and apparatus other than those stated in this practice may be used by agreement between the purchaser and the supplier with the specific deviations from the standard practice 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 independently 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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