ASTM D5427-03(2007)
(Practice)Standard Practice for Accelerated Aging of Inflatable Restraint Fabrics
Standard Practice for Accelerated Aging of Inflatable Restraint Fabrics
SIGNIFICANCE AND USE
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.
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.
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.
Fabric specimens are configured in accordance with the requirements of test methods to be conducted on the specimens subsequent to accelerated aging.
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 , 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:DescriptionSectionCycle agingHeat agingHumidity agingOzone aging
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.
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 5427 – 03 (Reapproved 2007)
Standard Practice for
Accelerated Aging of Inflatable Restraint Fabrics
This standard is issued under the fixed designation D5427; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 Military Standard:
MIL-STD-810E Environmental Testing and Engineering
1.1 This practice describes the procedures for the acceler-
Guidelines
ated aging of inflatable restraint fabrics when required as a
preparatory step for other test methods.
3. Terminology
1.1.1 In Section 7, this practice lists four methods for
3.1 Definitions:
conducting accelerated aging that are of concern to the design
3.1.1 For definitions of other terms used in this standard,
and manufacture of inflatable restraints. They are as follows:
refer to Terminology D123 and Terminology D6799.
Description Section
4. Summary of Practice
Cycle aging 8.4
Heat aging 8.5
4.1 After conditioning in the standard atmosphere for test-
Humidity aging 8.6
ing textiles, test specimens are subjected to accelerated aging
Ozone aging 8.7
for heat, humidity, ozone, or cycling.
1.2 This practice may be used in conjunction with other
4.2 Aged specimens are then reconditioned in the standard
ASTM test methods when subsequent tests of physical prop-
atmosphere for testing textiles for subsequent testing of the
erties are required of aged fabric specimens.
physical properties of inflatable restraint fabrics.
1.3 Procedures and apparatus other than those stated in this
practice may be used by agreement between the purchaser and
5. Significance and Use
the supplier with the specific deviations from the standard
5.1 For inflatable restraints, practices for conducting accel-
practice acknowledged in the report.
erated aging are designed to determine the aggravated effects
1.4 The values stated in either SI units or inch-pound units
on a fabric from exposures to heat, humidity, or ozone, or a
are to be regarded separately as standard. The values stated in
combinationthereof.Theseenvironmentalconditionsmayalso
each system are not exact equivalents; therefore, each system
be cycled in combination. The four accelerated aging proce-
must be used independently of the other.
dures of concern to the design and manufacture of inflatable
1.5 This standard does not purport to address all of the
restraints are referred to as cycle aging, heat aging, humidity
safety concerns, if any, associated with its use. It is the
aging, and ozone aging.
responsibility of the user of this standard to establish appro-
5.2 The environmental conditions described in this practice
priate safety and health practices and determine the applica-
are designed to allow restraints so that reliable comparisons
bility of regulatory limitations prior to use.
may be made between different fabrics and different laborato-
ries.
2. Referenced Documents
5.3 In order to achieve precise and reliable physical prop-
2.1 ASTM Standards:
erty comparisons of different fabrics, it is necessary to control
D123 Terminology Relating to Textiles
accurately the humidity, temperature, ozone, and cycling con-
D1776 Practice for Conditioning and Testing Textiles
ditions to which the fabric is subjected.
D6799 Terminology Relating to Inflatable Restraints
5.4 Fabric specimens are configured in accordance with the
E145 Specification for Gravity-Convection and Forced-
requirementsoftestmethodstobeconductedonthespecimens
Ventilation Ovens
subsequent to accelerated aging.
5.5 Unless otherwise specified by agreement between the
purchaser and the supplier, this practice shall constitute the
ThispracticeisunderthejurisdictionofASTMCommitteeD13onTextilesand
conditions, procedures, and equipment by which inflatable
is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
restraint fabrics are conditioned and aged. It is intended to be
Current edition approved July 1, 2007. Published August 2007. Originally
approved in 1993. Last previous edition approved in 2003 as D5427–03.
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 AvailablefromtheDefensePrintingOffice,Building4D,700RobbinsAvenue,
the ASTM website. Philadelphia, PA 19111-5093.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 5427 – 03 (2007)
used as a guideline in establishing a written material specifi- 8.2.1 Ifduringplacementofthespecimenstheenvironmen-
cation.Thespecificationoragreementofthepurchaserandthe tal conditions within the chamber are no longer within pre-
supplier may deviate from the practices described herein when scribedlimits,beginthetimingoftheagingprocessonlywhen
(based on experience) considerations of fabric properties, the chamber is once again stabilized within prescribed limits.
material handling equipment, or inflatable restraint system
8.2.2 Ensurethatthespecimensareplacedinthechamberin
design dictate otherwise. aconfigurationthatpermitsfreeflowofairaroundthemduring
the aging process.
6. Apparatus 8.2.3 Thechambertemperatureshallbecontrolledtowithin
62°C (65°F) and the relative humidity shall be controlled to
6.1 Conditioning Room or Chambers:
within 65% RH.
6.1.1 Room or chamber suitable for maintaining the stan-
8.3 Interruptions to an accelerated aging process may result
dardatmospherefortestingtextiles,withequipmentforrecord-
inexposureofthetestspecimen(s)toenvironmentalconditions
ing the temperature and humidity of the room.
that are more extreme than specified and that trend in a
6.1.2 For heat aging, a ventilated drying oven with a
direction away from ambient (an overtest interruption), or
temperature range from 100 to 130°C, 62°C (212 to 266°F,6
conditionsthatarelessextremethanspecifiedandthattrendin
5°F) for 400 h, in accordance with Specification E145.
a direction toward ambient (an undertest interruption).
6.1.3 For humidity aging, a chamber suitable for maintain-
8.3.1 If an undertest interruption occurs, keep the chamber
ing a fixed relative humidity of 60 to 98%, within a tolerance
closed in an effort to maintain tolerances. As long as the
of 65%, and a fixed temperature between 30 to 100°C 62°C
tolerances are maintained, resume testing by reestablishing the
(86 to 212°F,6 5°F) for at least 400 h.
prescribed conditions and continue from the point of the
6.1.4 For ozone aging, a chamber suitable for maintaining
interruption. If an unscheduled interruption occurs that causes
the ozone concentration at 100 6 10 parts per hundred million
the environmental conditions to exceed the allowable toler-
(pphm), and su
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