ASTM_D_3045_-_18.pdf

Designation:D304518Standard Practice forHeat Aging of Plastics Without Load1This standard is issued under the fixed designation D3045;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This practice is intended to define the exposure condi-tions for evaluating the thermal endurance of plastics whenexposed solely to hot air for extended periods of time.Only theprocedure for heat exposure is specified.The effect of elevatedtemperature on any particular property is determined byselection of the appropriate test method and test specimens forthat property.1.2 This practice can be used as a guide to compare thermalaging characteristics of materials as measured by the change insome property of interest.The property of interest is measuredat room temperature.1.3 This practice recommends procedures for comparing thethermal aging characteristics of materials at a single tempera-ture.Recommended procedures for determining the thermalaging characteristics of a material using a series of elevatedtemperatures for the purpose of estimating endurance time to adefined property change at a lower temperature are alsodescribed;the applicability of the Arrhenius relation formaking predictions to other temperatures,is assumed in thiscase.1.4 This practice does not predict thermal aging character-istics where interactions between stress,environment,temperature,and time control failure occur.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.NOTE1This standard and ISO-2578 address the same subject matterbut differ in technical content.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD5374 Test Methods for Forced-Convection Laboratory Ov-ens for Evaluation of Electrical InsulationD5423 Specification for Forced-Convection Laboratory Ov-ens for Evaluation of Electrical InsulationE145 Specification for Gravity-Convection and Forced-Ventilation OvensE456 Terminology Relating to Quality and Statistics2.2 ISO Standards:3ISO 2578(1993)Determination of Time-Temperature Lim-its After Exposure to Prolonged Action of HeatISO 9080(2012)Plastic Piping and Ducting SystemsDetermination of the Long-Term Hydrostatic Strength ofThermoplastic Materials in Pipe Form by Extrapolation3.Terminology3.1 GeneralThe terminology given in Terminology D883and Terminology E456 is applicable to this practice.Terminol-ogy not in place is defined in 3.2.3.2 Definitions:3.2.1 continuous use temperature(CUT)the temperaturein degrees Celsius corresponding to a given thermal endurancetime for a given failure criterion(typically 50%reduction inproperty),derived from the Arrhenius relation of endurancetime and temperature,determined by heat aging at severalelevated temperatures.Several CUT values can exist,one foreach property,endurance time and endurance criterion.3.2.1.1 DiscussionIn practice,the continuous use tem-perature for a plastic,involves other environmental consider-ations as discussed elsewhere in this standard,than thermal1This practice is under the jurisdiction ofASTM Committee D20 on Plastics andis the direct responsibility of Subcommittee D20.50 on Durability of Plastics.Current edition approved Aug.1,2018.Published August 2018.Originallyapproved in 1974.Last previous edition approved in 2010 as D3045 92(2010).DOI:10.1520/D3045-18.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by th