ASTM_D_5807_-_08_2013.pdf

Designation:D580708(Reapproved 2013)Standard Practice forEvaluating the Overpressurization Characteristics ofInflatable Restraint Cushions1This standard is issued under the fixed designation D5807;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number 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 covers the procedures and conditions usedto evaluate the physical performance of inflatable restraintcushions during and after overpressurization testing at elevatedpressures capable of causing cushion bursting using air pres-surization equipment.1.2 The physical performance characteristics that may beobtained in conjunction with this practice are internal cushionpressures determined by instrumentation and material integrity,determined by visual inspection.1.3 This practice is applicable to all inflatable restraintcushions.1.4 Procedures and apparatus other than those stated in thispractice may be used by agreement between purchaser andsupplier with the specific deviations from this practice ac-knowledged in the report.1.5 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.1.6 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 limitations prior to use.See Section 8 forspecific hazard information.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD6799 Terminology Relating to Inflatable Restraints3.Terminology3.1 Definitions:3.2 For all terminology relating to D13.20,InflatableRestraints,refer to Terminology D6799.3.2.1 The following terms are relevant to this standard:cushion,cushion overpressurization,deployment,inflatablerestraint,module,standard atmosphere for testing textiles.3.3 For all other terms related to textiles,see TerminologyD123.4.Summary of Practice4.1 Inflatable restraint cushions are tested under laboratoryconditions to evaluate cushion integrity when exposed tointernal cushion pressures greater than deployment pressures.If cushion rupture occurs,the rupture pressure,time to rupture,and mode of rupture are recorded.4.2 Inflatable restraint cushions are mounted into a teststand that allows for inflations under conditions that exceeddeployment pressures.Instrumentation within the test standcharts inflation pressures versus time and may allow forphotographic review of the overpressurization sequence.4.3 Cushion overpressurization results are reviewed forpressure and time relationships,and post-inflation materialanalysis.5.Significance and Use5.1 This practice is intended to be a general guideline forrepetitive testing,safe conduct of tests,and accurate datacollection for inflatable restraints.Cushion overpressurizationtesting may be used for design and production validation,formanufacturing process control,for lot acceptance,or for acombination thereof.5.2 This practice constitutes the conditions,apparatus,andprocedures by which inflatable restraints are commonly testedfor cushion overpressurization.It is intended to be used as aguideline in establishing a cushion specification or equivalentdocument.The practices in the specification may deviate fromthe practices described herein when(based on experience)considerations of equipment,cushion design,or other factorsdictate otherwise.1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.Current edition approved July 1,2013.Published September 2013.Originallyapproved in 1995.Last previous edition approved in 2008 as D5807 08.DOI:10.1520/D5807-08R13.2For referenced 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3 There exists a large variety in cushion configurationsand equipment designs,obviating a standard test method forcushion overpressurization.Therefore,a cushion specificationshould incorporate the practices stated herein when describinga test method for testing a specific cushion geometry andapparatus design.To ensure accuracy and repeatability,thespecification should also address precision and bias in amanner consistent with ASTM prescribed procedures andconsistent with the particular cushion geometry,equipment inuse,and test procedures.5.3.1 Sources of variation in cushio