1、Designation: D 5427 09Standard 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 last revision. A n
2、umber in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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 apreparatory step for
3、 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 (Option “A” or “B”) 8.4Heat aging (Option “A” or “B”) 8.6Humidity agi
4、ng (Option “A” or “B”) 8.7Ozone aging 8.81.2 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
5、the purchaser andthe supplier with the specific 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
6、 be used independently of the other.1.5 This 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 limi
7、tations prior to use.2. Referenced Documents2.1 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:
8、MIL-STD-810E Environmental Testing and EngineeringGuidelines33. Terminology3.1 For all terminology relating to D13.20, Inflatable re-straints, refer to Terminology D 6799.3.1.1 The following terms are relevant to this standard:accelerated ageing, envirionmental conditions, inflatable re-straint, sta
9、ndard atmosphere for testing textiles3.2 For all other terms related to textiles, see TerminologyD 123.4. Summary of Practice4.1 After conditioning in the standard atmosphere for test-ing textiles, test specimens are subjected to accelerated agingfor heat, humidity, ozone, or cycling.4.2 Aged specim
10、ens 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-erated aging are designed to determine the aggravated effect
11、son 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 inflatablerestraints are referred to as cycle aging, heat aging, humid
12、ityaging, 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 and reliable physical prop-erty comparisons of different
13、 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 the specimenssubsequent to accelerated aging.1This pract
14、ice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.Current edition approved Jan. 15, 2009. Published February 2009. Originallyapproved in 1993. Last previous edition approved in 2008 as D 5427 08.2For referen
15、ced ASTM 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 RobbinsAven
16、ue,Philadelphia, PA 19111-5093.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.5 Unless otherwise specified by agreement between thepurchaser and the supplier, this practice shall constitute theconditions, procedures, and equipment
17、 by which inflatablerestraint fabrics are conditioned and aged. It is intended to beused as a guideline in establishing a written material specifi-cation. The specification or agreement of the purchaser and thesupplier may deviate from the practices described herein when(based on experience) conside
18、rations 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 textiles, with equipment for record-ing the temperature a
19、nd humidity of the room.6.1.2 For heat aging, a ventilated drying oven with atemperature range from 100 to 130 C, 62 C (212 to 266 F,65 F) for 500 h, in accordance with Specification E 145.6.1.3 For humidity aging, a chamber suitable for maintain-ing a fixed relative humidity of 60 to 98 %, within a
20、 toleranceof 65 %, and a fixed temperature between 30 to 100 C 62C(86 to 212 F,6 5 F) for at least 500 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 maintaining a temperature at 38 62C (100 6 5 F).6.1.
21、5 For cycle aging, a chamber with controls for cyclingthrough several temperatures from 40 to 107 C 6 2 C (40to 225 F, 6 5F) 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,the sensors, and the data collection syst
22、em 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 independent agencyor equipment manufacture
23、r 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 document.7. Sampling7.1 Rolls of fabric are sa
24、mpled 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 property testing.8. Procedure8.1 Condition fabri
25、c 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 supplier and acknowl-edged in the test rep
26、ort.8.2 Expose the specimens in accordance with the proce-dures given in 8.4-8.8, 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 specimens the environmen-tal conditions within
27、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 flow of air around them duringthe aging proc
28、ess.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 conditionsthat are more extreme than specified and
29、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 in an effort to maintain tolerances. As l
30、ong 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 the direction of standard ambient condit
31、ions, 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 valid.8.3.2 If an overtest interruption o
32、ccurs, 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 the cycle sequencelisted in Section 8.4.2,
33、pre-set the cycling chamber to thespecified temperature and relative humidity of the phase for 6065 min or until the temperature has stabilized to within 62C(65 F), whichever is less.8.4.2 Place the specimens in the cycling chamber, and allowthe specimens to remain undisturbed for the duration of th
34、reecycles:8.4.3 Two options are provided for Cycling Aging:8.4.3.1 Option “A” sequence:29 h, 240 C 62C240 F 6 5F!, ambient RH, (1)19 h, 22 C 62C72 F 6 5F!, 95 % RH, (2)29 h, 107 C 62C225 F 6 5 F!, ambient RH, (3)19 h, 22 C 62C72 F 6 5F!, 95 % RH, (4)NOTE 1The times listed do not include ramp time.D5
35、4270928.4.3.2 Option “B” sequence:29 h, 240 C 62C240 F 6 5F!, ambient RH, (5)19 h, 22 C 62C72 F 6 5F!, 95 % RH, (6)29 h, 105 C 62C221 F 6 5F!, ambient RH, (7)19 h, 22 C 62C72 F 6 5 F!, 95 % RH, (8)8.5 Upon completion of the cycles, remove the specimensand recondition them for 24 h in the standard at
36、mosphere fortesting textiles prior to conducting subsequent tests.8.6 Heat Aging:8.6.1 Two options are provided for temperature/duration:8.6.1.1 Option “A” 120 C 62 C for 336 h.8.6.1.2 Option “B” 105 C 62 C for 408 h.8.6.2 Preheat the ventilated drying oven to required tem-perature for 60 min or unt
37、il the temperature has stabilized towithin 62C(65 F).8.6.3 Place the test specimens in the oven in a flat, horizon-tal configuration and allow them to remain undisturbed forspecified duration as identified by Option “A” or “B”.8.7 Humidity Aging:8.7.1 Two options are provided for temperature/humidit
38、y/duration:P,8.7.1.1 Option “A” 80 C 6 2 C (180 F 6 5 C) and 95 %6 2% RH for 336 h.8.7.1.2 Option “B” 70 C 6 2 C (160 F 6 5 F) and 95%6 2% RH for 408 h.8.7.2 Preset the temperature and relative humidity in thehumidity chamber as identified in Option “A” or “B”for 60 minor until the temperature has s
39、tabilized to within 62C(65 F)and the humidity to within 6 2% RH.8.7.3 Place the specimens in the humidity chamber, andallow the specimens to remain undisturbed at the presetconditions for.specified duration.8.7.4 When the process is completed, remove the specimensfrom the humidity chamber. Precondit
40、ion in accordance withPractice D 1776 and then recondition the specimens for 24 h inthe standard atmosphere for testing textiles prior to conductingsubsequent tests.8.8 Ozone Aging:8.8.1 Preset the ozone chamber to 40 C (100 F), 65 % RH,and 50 pphm for 60 min or until the temperature has stabilizedt
41、o within 62C(65 F), and the ozone concentration to within620 pphm.8.8.2 Place the test specimens in the ozone chamber in a flat,horizontal position and allow them to remain undisturbed at thepreset conditions for 336 h.8.8.3 When the process is completed, remove the specimensfrom the ozone chamber a
42、nd recondition them for 24 h in thestandard atmosphere for testing textiles prior to conductingsubsequent tests.9. Report9.1 State that the fabric specimens were treated as directedin accordance with Practice D 5427 for accelerated aging ofinflatable restraint fabrics.9.2 The purchaser and the suppl
43、ier 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 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 pro
44、cedure(s) performed, includingmethod/option(s) used,9.2.7 Nature and extent of test interruptions, and9.2.8 Deviations from standard practice procedures andapparatus.10. Precision and Bias10.1 No statement is made about either the precision or biasof this practice for accelerated aging of inflatable
45、 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 accelerated aging; aging; airbag; conditioning; inflat-able restraintASTM International takes no position respecting the validity of
46、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 such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to r
47、evision 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 invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Yo
48、ur 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 fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is cop
49、yrighted 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).D5427093
