1、Designation:D64807Standard 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 yea
2、r 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 dete
3、rmination 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 tempera
4、ture.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
5、 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 brackets are for information only.1.4 Due to the potential safety and environ
6、mental hazardsassociated with mercury-filled thermometers,the use of alter-native temperature measuring devices(such as thermocouplesor RTDs)is encouraged.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 thi
7、s standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE2The test method described as a Method B of this test method,and test methods Ae and Be of ISO 75-1 and ISO 75-2,1993,aretechnically equivalent.2.Referenced Do
8、cuments2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1898 Practice for Sampling of Plastics(Withdrawn 1998)3D5947 Test Methods for Physical Dimensions of SolidPlastics SpecimensE1 Specification for ASTM Liquid-in-Glass ThermometersE77 Te
9、st 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-tan
10、ce Thermometers2.2 ISO Standards:4ISO 75-1 PlasticsDetermination of Temperature of De-flection Under LoadPart 1:General Test MethodISO 75-2 PlasticsDetermination of Temperature of De-flection Under LoadPart 2:Plastics and Ebonite2.3 NIST Document:5NBS Special Publication 250-223.Terminology3.1 Gener
11、alThe definitions of plastics used in this testmethod are in accordance with Terminology D883 unlessotherwise indicated.4.Summary of Test Method4.1 A bar of rectangular cross section is tested in theedgewise position as a simple beam with the load applied at itscenter to give maximum fiber stresses
12、of 0.455 MPa(66 psi)or1.82 MPa(264 psi)(Note 3).The specimen is immersed underload in a heat-transfer medium provided with a means ofraising the temperature at 2 6 0.2C/min.The temperature ofthe medium is measured when the test bar has deflected 0.251This test method is under the jurisdiction of AST
13、M Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.30 on Thermal Properties.Current edition approved March 1,2007.Published March 2007.Originallyapproved in 1941.Last previous edition approved in 2006 as D648-06.DOI:10.1520/D0648-07.2For referenced ASTM standards,visit t
14、he 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Amer
15、ican National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036.5Mangum,B.W.,“Platinum Resistance Thermometer Calibration,”NBS SpecialPublication 250-22,1987.Available from National Institute of Standards andTechnology,Gaithersburg,MD.*A Summary of Changes section appears at the en
16、d of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 mm(0.010 in.).This temperature is recorded as the deflectiontemperature under flexural load of the test specimen.NOTE3Around robin has been conducted that showed that there is noadvantage to using higher loads when measuring deflection temperature ofpresent-day plastics with present-day instruments.5.Significance and Use5.1 This test is particularly suited to control an
