1、Designation:D1525171Standard Test Method forVicat Softening Temperature of Plastics1This standard is issued under the fixed designation D1525;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 paren
2、theses 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.1NOTEEditorial changes were made throughout the standard in September 2017.1.Sco
3、pe*1.1 This test method covers determination of the tempera-ture at which a specified needle penetration occurs whenspecimens are subjected to specified controlled test conditions.1.2 This test method is not recommended for ethylcellulose,nonrigid poly(vinyl chloride),poly(vinylidenechloride),or oth
4、er materials having a wide Vicat softeningrange.1.3 The values stated in SI units are to be regarded asstandard.No other units are included in this standard.1.4 Due to the potential safety and environmental hazardsassociated with mercury-filled thermometers,the use of alter-native temperature measur
5、ing devices(such as thermocouplesand RTDs)is encouraged with liquid-in-glass thermometerscontaining mercury,the use of alternative measuring devices,such as digital thermometers using thermocouple of RTDsensors is encouraged.1.5 This standard does not purport to address all of thesafety concerns,if
6、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 test method is equivalent to ISO 306 in all sections withthe exceptio
7、ns of the allowance for creep,prior to the beginning of the testand the allowance of the fluidized powder as a heat transfer medium.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles fo
8、r 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 PlasticsD1898 Practice for
9、 Sampling of Plastics(Withdrawn 1998)3E1 Specification for ASTM Liquid-in-Glass ThermometersE77 Test Method for Inspection and Verification of Ther-mometersE608/E608M Specification for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 toDe
10、termine the Precision of a Test MethodE879 Specification for Thermistor Sensors for General Pur-pose and Laboratory Temperature MeasurementsE1137/E1137M Specification for Industrial Platinum Resis-tance ThermometersE2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision
11、LiquidsE2935 Practice for Conducting Equivalence Testing inLaboratory Applications2.2 ISO Standards:4ISO 306 PlasticsThermoplastic MaterialDeterminationof Vicat Softening Temperature3.Terminology3.1 Definitions:3.1.1 Definitions of plastics used in this test method are inaccordance with those define
12、d in Terminology D883,unlessotherwise specified.3.1.2 Vicat softening temperaturethe temperature at whicha flat-ended needle of 1-mm2circular cross section willpenetrate a thermoplastic specimen to a depth of 1 mm under1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand
13、is the direct responsibility of Subcommittee D20.30 on Thermal Properties(Section D20.30.07).Current edition approved Aug.1,2017.Published August 2017.Originallyapproved in 1958.Last previous edition approved in 2009 as D1525-09.DOI:10.1520/D1525-17E01.2For referenced ASTM standards,visit the ASTM w
14、ebsite,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 American Nati
15、onal 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 dev
16、eloped 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 a specified load(force)perpendicular to the test specimenusing a selected uniform rate of temperature rise.4.Summary of Test Method4.1 A flat-ended needle loaded with a specified mass isplaced in direct contact with a t