ASTM_D_648_-_18.pdf

Designation:D64818Standard Test Method forDeflection Temperature of Plastics Under Flexural Load inthe Edgewise Position1This standard is issued under the fixed designation D648;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 test method covers the determination of the tem-perature at which an arbitrary deformation occurs when speci-mens are subjected to an arbitrary set of testing conditions.1.2 This test method applies to molded and sheet materialsavailable in thicknesses of 3 mm(18in.)or greater and whichare rigid or semirigid at normal temperature.NOTE1Sheet stock less than 3 mm(0.125 in.)but more than 1 mm(0.040 in.)in thickness may be tested by use of a composite sample havinga minimum thickness of 3 mm.The laminae must be of uniform stressdistribution.One type of composite specimen has been prepared bycementing the ends of the laminae together and then smoothing the edgeswith sandpaper.The direction of loading shall be perpendicular to theedges of the individual laminae.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.4 Some older machines still use mercury-in-glass ther-mometers.(WarningMercury has been designated by manyregulatory agencies as a hazardous material that can causeserious medical issues.Mercury,or its vapor,has beendemonstrated to be hazardous to health and corrosive tomaterials.Caution should be taken when handling mercuryand mercury containing products.See the applicable productSafety Data Sheet(SDS)for additional information.Usersshould be aware that selling mercury and/or mercury contain-ing products into your state or country may be prohibited bylaw.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.NOTE2The text of this standard references notes and footnotes thatprovide explanatory material.These notes and footnotes(excluding thosein tables and figures)shall not be considered as requirements of thestandard.NOTE3This standard and ISO 75-1 and ISO 75-2 address the samesubject matter,but differ in technical content,and results shall not becompared between the two test methods.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 PlasticsD4000 Classification System for Specifying Plastic Materi-alsD5947 Test Methods for Physical Dimensions of SolidPlastics SpecimensE1 Specification for ASTM Liquid-in-Glass ThermometersE77 Test Method for Inspection and Verification of Ther-mometersE608/E608M Specification for Mineral-Insulated,Metal-Sheathed Base Metal ThermocouplesE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1137/E1137M Specification for Industrial Platinum Resis-tance ThermometersE2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision Liquids2.2 ISO Standards:3ISO 75-1 PlasticsDetermination of Temperature of De-flection Under LoadPart 1:General Test Method1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.30 on Thermal Properties.Current edition approved April 1,2018.Published April 2018.Originallyapproved in 1941.Last previous edition approved in 2016 as D648-16.DOI:10.1520/D0648-18.2For 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 the World Trade Organization Technical Barriers to T