ASTM_G_114_-_14.pdf

Designation:G11414Standard Practices forEvaluating the Age Resistance of Polymeric Materials Usedin Oxygen Service1This standard is issued under the fixed designation G114;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 These practices describe procedures that are used todetermine the age resistance of plastic,thermosetting,elastomeric,and polymer matrix composite materials exposedto oxygen-containing media.1.2 While these practices focus on evaluating the ageresistance of polymeric materials in oxygen-containing mediaprior to ignition and combustion testing,they also haverelevance for evaluating the age resistance of metals,andnonmetallic oils and greases.1.3 These practices address both established procedures thathave a foundation of experience and new procedures that haveyet to be validated.The latter are included to promote researchand later elaboration in this practice as methods of the formertype.1.4 The results of these practices may not give exactcorrelation with service performance since service conditionsvary widely and may involve multiple factors such as thoselisted in subsection 5.8.1.5 Three procedures are described for evaluating the ageresistance of polymeric materials depending on application andinformation sought.1.5.1 Procedure A:Natural AgingThis procedure is usedto simulate the effect(s)of one or more service stressors on amaterials oxygen resistance,and is suitable for evaluatingmaterials that experience continuous or intermittent exposureto elevated temperature during service.1.5.2 Procedure B:Accelerated Aging Comparative OxygenResistanceThis procedure is suitable for evaluating materialsthat are used in ambient temperature service,or at a tempera-ture that is otherwise lower than the aging temperature,and isuseful for developing oxygen compatibility rankings on alaboratory comparison basis.1.5.3 Procedure C:Accelerated Aging Lifetime PredictionThis procedure is used to determine the relationship betweenaging temperature and a fixed level of property change,therebyallowing predictions to be made about the effect of prolongedservice on oxidative degradation.1.6 The values stated in SI units are to be regarded as thestandard,however,all numerical values shall also be cited inthe systems in which they were actually measured.1.7 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.Specific precau-tionary statements are given in Section 10.2.Referenced Documents2.1 ASTM Standards:2D395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD638 Test Method for Tensile Properties of PlasticsD1349 Practice for RubberStandard Conditions for Test-ingD1708 Test Method for Tensile Properties of Plastics by Useof Microtensile SpecimensD2240 Test Method for Rubber PropertyDurometer Hard-nessD2512 Test Method for Compatibility of Materials withLiquid Oxygen(Impact Sensitivity Threshold and Pass-Fail Techniques)D2863 Test Method for Measuring the Minimum OxygenConcentration to Support Candle-Like Combustion ofPlastics(Oxygen Index)D3039 Test Method for Tensile Properties of Polymer Ma-trix Composite MaterialsD3045 Practice for Heat Aging of Plastics Without LoadD4809 Test Method for Heat of Combustion of LiquidHydrocarbon Fuels by Bomb Calorimeter(PrecisionMethod)1These practices are under the jurisdiction of ASTM Committee G04 onCompatibility and Sensitivity of Materials in Oxygen Enriched Atmospheres and isthe direct responsibility of Subcommittee G04.02 on Recommended Practices.Current edition approved Oct.1,2014.Published November 2014.Originallyapproved in 1993.Last previous edition approved in 2007 as G114 07.DOI:10.1520/G0114-14.2For 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 G63 Guide for Evaluating Nonmetallic Materials for Oxy-gen ServiceG72 Test Method for Autogenous Ignition Temperature ofLiquids and Solids in a High-Pressure Oxygen-EnrichedEnvironmentG74 Test Method for Ignition Sensitivity of NonmetallicMaterials and Components by Gaseous Fluid ImpactG86 Test Method for Determining Ignition Sensitivity ofMaterials to Mechanical Impact in Ambient Liquid Oxy-gen and Pressurized Liquid and Gaseous Oxygen Envi-ronmentsG125 Test Method for Measuring Liquid and