ASTM_D_1830_-_17.pdf

Designation:D183017Standard Test Method forThermal Endurance of Flexible Sheet Materials Used forElectrical Insulation by the Curved Electrode Method1This standard is issued under the fixed designation D1830;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.Scope1.1 This test method provides a procedure for evaluatingthermal endurance of flexible sheet materials by determiningdielectric breakdown voltage at room temperature after agingin air at selected elevated temperatures.Thermal endurance isexpressed in terms of a temperature index.1.2 This test method is applicable to such solid electricalinsulating materials as coated fabrics,dielectric films,compos-ite laminates,and other materials where retention of flexibilityafter heat aging is of major importance(see Note 4).1.3 This test method is not intended for the evaluation ofrigid laminate materials nor for the determination of thermalendurance of those materials which are not expected orrequired to retain flexibility in actual service.1.4 The values stated in acceptable metric units are to beregarded as the standard.The values in parentheses are forinformation only.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.For a specific hazard statement,see 10.1.1.6 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:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD374 Test Methods for Thickness of Solid Electrical Insu-lation(Metric)D0374_D0374MD5423 Specification for Forced-Convection Laboratory Ov-ens for Evaluation of Electrical Insulation2.2 Institute of Electrical and Electronics Engineers Publi-cations:3IEEE No.1 General Principles for Temperature Limits in theRating of Electrical EquipmentIEEE No.101A Guide for the Statistical Analysis of Ther-mal Life Test Data(including Appendix A)2.3 IEC Publications:IEC 216 Guide for the Determination of Thermal EnduranceProperties of Electrical Insulating Materials(Parts 1 and2)43.Terminology3.1 Definitions:3.1.1 temperature index,na number which permits com-parison of the temperature/time characteristics of an electricalinsulating material,or a simple combination of materials,basedon the temperature in degrees Celsius which is obtained byextrapolating the Arrhenius plot of life versus temperature to aspecified time,usually 20 000 h.1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.01 on Electrical Insulating ProductsCurrent edition approved Nov.1,2017.Published December 2017.Originallyapproved in 1961.Last previous edition approved in 2012 as D1830 99(2012).DOI:10.1520/D1830-17.2For 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 Institute of Electrical and Electronics Engineers,Inc.(IEEE),445 Hoes Ln.,P.O.Box 1331,Piscataway,NJ 08854-1331.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036.Copyright 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 the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.1.2 thermal life,nthe time necessary for a specificproperty of a material,or simple combination of materials,todegrade to a defined end point when aged at a specifictemperature.3.1.3 thermal life curve,na graphical representation ofthermal life at a specified aging temperature in which the valueof a property of a material,or a simple combination ofmaterials,is measured at room temperature and the valuesplotted as a function of time.3.2 Definitions of Terms Specific to This Standard:3.2.1 thermal