1、Designation: D 5427 03 (Reapproved 2007)Standard Practice forAccelerated Aging of Inflatable Restraint Fabrics1This standard is issued under the fixed designation D 5427; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice describes the procedures for the acceler-ated aging of inflatable restraint fabrics when required as ap
3、reparatory step for other test methods.1.1.1 In Section 7, this practice lists four methods forconducting accelerated aging that are of concern to the designand manufacture of inflatable restraints. They are as follows:Description SectionCycle aging 8.4Heat aging 8.5Humidity aging 8.6Ozone aging 8.7
4、1.2 This practice may be used in conjunction with otherASTM test methods when subsequent tests of physical prop-erties are required of aged fabric specimens.1.3 Procedures and apparatus other than those stated in thispractice may be used by agreement between the purchaser andthe supplier with the sp
5、ecific deviations from the standardpractice acknowledged in the report.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system are not exact equivalents; therefore, each systemmust be used independently of the other.1.5 T
6、his standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Docume
7、nts2.1 ASTM Standards:2D 123 Terminology Relating to TextilesD 1776 Practice for Conditioning and Testing TextilesD 6799 Terminology Relating to Inflatable RestraintsE 145 Specification for Gravity-Convection and Forced-Ventilation Ovens2.2 Military Standard:MIL-STD-810E Environmental Testing and En
8、gineeringGuidelines33. Terminology3.1 Definitions:3.1.1 For definitions of other terms used in this standard,refer to Terminology D 123 and Terminology D 6799.4. Summary of Practice4.1 After conditioning in the standard atmosphere for test-ing textiles, test specimens are subjected to accelerated ag
9、ingfor heat, humidity, ozone, or cycling.4.2 Aged specimens are then reconditioned in the standardatmosphere for testing textiles for subsequent testing of thephysical properties of inflatable restraint fabrics.5. Significance and Use5.1 For inflatable restraints, practices for conducting accel-erat
10、ed aging are designed to determine the aggravated effectson a fabric from exposures to heat, humidity, or ozone, or acombination thereof. These environmental conditions may alsobe cycled in combination. The four accelerated aging proce-dures of concern to the design and manufacture of inflatablerest
11、raints are referred to as cycle aging, heat aging, humidityaging, and ozone aging.5.2 The environmental conditions described in this practiceare designed to allow restraints so that reliable comparisonsmay be made between different fabrics and different laborato-ries.5.3 In order to achieve precise
12、and reliable physical prop-erty comparisons of different fabrics, it is necessary to controlaccurately the humidity, temperature, ozone, and cycling con-ditions to which the fabric is subjected.5.4 Fabric specimens are configured in accordance with therequirements of test methods to be conducted on
13、the specimenssubsequent to accelerated aging.5.5 Unless otherwise specified by agreement between thepurchaser and the supplier, this practice shall constitute theconditions, procedures, and equipment by which inflatablerestraint fabrics are conditioned and aged. It is intended to be1This practice is
14、 under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.Current edition approved July 1, 2007. Published August 2007. Originallyapproved in 1993. Last previous edition approved in 2003 as D 5427 03.2For referenced ASTM
15、standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from the Defense Printing Office, Building 4D, 700 RobbinsAvenue,Philad
16、elphia, PA 19111-5093.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.used as a guideline in establishing a written material specifi-cation. The specification or agreement of the purchaser and thesupplier may deviate from the practic
17、es described herein when(based on experience) considerations of fabric properties,material handling equipment, or inflatable restraint systemdesign dictate otherwise.6. Apparatus6.1 Conditioning Room or Chambers:6.1.1 Room or chamber suitable for maintaining the stan-dard atmosphere for testing text
18、iles, with equipment for record-ing the temperature and humidity of the room.6.1.2 For heat aging, a ventilated drying oven with atemperature range from 100 to 130C, 62C (212 to 266F,65F) for 400 h, in accordance with Specification E 145.6.1.3 For humidity aging, a chamber suitable for maintain-ing
19、a fixed relative humidity of 60 to 98 %, within a toleranceof 65 %, and a fixed temperature between 30 to 100C 62C(86 to 212F,6 5F) for at least 400 h.6.1.4 For ozone aging, a chamber suitable for maintainingthe ozone concentration at 100 6 10 parts per hundred million(pphm), and suitable for mainta
20、ining a temperature at 38 62C (100 6 5F).6.1.5 For cycle aging, a chamber with controls for cyclingthrough several temperatures from 40 to 107C 6 2C (40to 225F, 65F) and levels of relative humidity up to 95 %,65 % for cycle times up to 72 h.6.1.6 The aging chamber, the accessories contained therein,
21、the sensors, and the data collection system shall be constructedand arranged in accordance with MIL-STD-810E, Method507.3, Section II.6.2 For inflatable restraints, all test equipment used inaccordance with the procedures referenced in this practice shallbe certified for calibration annually by an i
22、ndependent agencyor equipment manufacturer whose results are traceable toNational Institute of Science and Technology (NIST) or othernational standards laboratory. The test parameters of theequipment shall be tested within the operating ranges coveredin the material specification or equivalent docum
23、ent.7. Sampling7.1 Rolls of fabric are sampled to yield test specimens inaccordance with the sampling plan agreed upon by purchaserand supplier. The number of test specimens and their configu-ration shall conform to the requirements of the ASTM testmethods associated with subsequent physical propert
24、y testing.8. Procedure8.1 Condition fabric specimens in the standard atmospherefor testing textiles for 24 h and configure them in accordancewith the test method that is to follow each accelerated agingprocedure, or in accordance with alternate procedures estab-lished by agreement of purchaser and s
25、upplier and acknowl-edged in the test report.8.2 Expose the specimens in accordance with the proce-dures given in 8.4-8.7, or in accordance with alternate proce-dures established by agreement between the purchaser and thesupplier and acknowledged in the report.8.2.1 If during placement of the specim
26、ens the environmen-tal conditions within the chamber are no longer within pre-scribed limits, begin the timing of the aging process only whenthe chamber is once again stabilized within prescribed limits.8.2.2 Ensure that the specimens are placed in the chamber ina configuration that permits free flo
27、w of air around them duringthe aging process.8.2.3 The chamber temperature shall be controlled to within62C (65F) and the relative humidity shall be controlled towithin 65 % RH.8.3 Interruptions to an accelerated aging process may resultin exposure of the test specimen(s) to environmental conditions
28、that are more extreme than specified and that trend in adirection away from ambient (an overtest interruption), orconditions that are less extreme than specified and that trend ina direction toward ambient (an undertest interruption).8.3.1 If an undertest interruption occurs, keep the chamberclosed
29、in an effort to maintain tolerances. As long as thetolerances are maintained, resume testing by reestablishing theprescribed conditions and continue from the point of theinterruption. If an unscheduled interruption occurs that causesthe environmental conditions to exceed the allowable toler-ances in
30、 the direction of standard ambient conditions, reinitiatethe test at the end of the last successfully completed cycle.Anytest specimen subject to an undertest interruption that failssubsequent physical property testing shall be treated as afailure and the test of the specimen(s) shall be considered
31、valid.8.3.2 If an overtest interruption occurs, terminate the accel-erated aging process and reinitiate the process with new testspecimens. Physical property tests of specimens subjected toan overtest interruption shall be considered invalid.8.4 Cycle Aging:8.4.1 Prior to conducting each phase of th
32、e cycle sequencelisted in Section 8.4.2, pre-set the cycling chamber to thetemperature and relative humidity of the phase for 60 min oruntil the temperature has stabilized to within 62C (65F),whichever is less.8.4.2 Place the specimens in the cycling chamber, and allowthe specimens to remain undistu
33、rbed for the duration of threecycles, each of the following sequence:29 h, 240C 240F!, ambient RH, (1)19 h, 22C 72F!, 95 % RH, (2)29 h, 107C 225F!, ambient RH, (3)19 h, 22C 72F!, 95 % RH, (4)NOTE 1The times listed do not include ramp time.8.4.3 Upon completion of the cycles, remove the specimensand
34、recondition them for 24 h in the standard atmosphere fortesting textiles prior to conducting subsequent tests.8.5 Heat Aging:8.5.1 Preheat the ventilated drying oven to 120C (250F)for 60 min or until the temperature has stabilized to within62C (65F).8.5.2 Place the test specimens in the oven in a fl
35、at, horizon-tal configuration and allow them to remain undisturbed at120C (250F) for 336 h.D 5427 03 (2007)28.5.3 When the process is completed, remove the specimensfrom the oven and recondition them for 24 h in the standardatmosphere for testing textiles prior to conducting subsequenttests.8.6 Humi
36、dity Aging:8.6.1 Preset the temperature and relative humidity in thehumidity chamber to 80C (180F) and 95 % RH for 60 min oruntil the temperature has stabilized to within 62C (65F) andthe humidity to within 65 % RH.8.6.2 Place the specimens in the humidity chamber, andallow the specimens to remain u
37、ndisturbed at the presetconditions for 336 h.8.6.3 When the process is completed, remove the specimensfrom the humidity chamber. Precondition in accordance withPractice D 1776 and then recondition the specimens for 24 h inthe standard atmosphere for testing textiles prior to conductingsubsequent tes
38、ts.8.7 Ozone Aging:8.7.1 Preset the ozone chamber to 40C (100F), 65 % RH,and 50 pphm for 60 min or until the temperature has stabilizedto within 62C (65F), and the ozone concentration to within620 pphm.8.7.2 Place the test specimens in the ozone chamber in a flat,horizontal position and allow them t
39、o remain undisturbed at thepreset conditions for 336 h.8.7.3 When the process is completed, remove the specimensfrom the ozone chamber and recondition them for 24 h in thestandard atmosphere for testing textiles prior to conductingsubsequent tests.9. Report9.1 State that the fabric specimens were tr
40、eated as directedin accordance with Practice D 5427 for accelerated aging ofinflatable restraint fabrics.9.2 The purchaser and the supplier shall determine the exactform of the report. Unless otherwise specified, the form shallprovide the following information:9.2.1 Fabric designation,9.2.2 Roll and
41、 lot identification,9.2.3 Date of report,9.2.4 Name of person certifying report,9.2.5 Relevant specification,9.2.6 Accelerated aging procedure(s) performed, includingmethod(s) used,9.2.7 Nature and extent of test interruptions, and9.2.8 Deviations from standard practice procedures andapparatus.10. P
42、recision and Bias10.1 No statement is made about either the precision or biasof this practice for accelerated aging of inflatable restraintfabric since the result merely prepares the fabric for subsequentphysical tests not covered by this practice, and no measure-ments are made.11. Keywords11.1 acce
43、lerated aging; aging; airbag; conditioning; inflat-able restraintASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any su
44、ch patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invit
45、ed either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a
46、 fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 5427 03 (2007)3
