1、Designation:D152509Standard 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 parent
2、heses 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 covers determination of the tempera-ture at which a s
3、pecified 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 other materials having a wide Vicat softeningrange.1.3 The values stated in SI u
4、nits are to be regarded asstandard.1.4 Due to the potential safety and environmental hazardsassociated with mercury-filled thermometers,the use of alter-native temperature measuring devices(such as thermocouplesand RTDs)is encouraged.1.5 This standard does not purport to address all of thesafety con
5、cerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE1This test method is equivalent to ISO 306 in all sections withthe exceptions of
6、 the allowance for creep,prior to the beginning of the testand the allowance of the fluidized powder as a heat transfer medium.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1898 Practice for Sampling of Plastics(Wit
7、hdrawn 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 toDetermine the Precision of
8、a Test MethodE1137/E1137M Specification for Industrial Platinum Resis-tance Thermometers2.2 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
9、defined 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 undera specified load using a selected uniform rate of temperaturerise.4.Summary
10、 of Test Method4.1 A flat-ended needle loaded with a specified mass isplaced in direct contact with a test specimen.The mass appliedcan be one of two accepted loads,as follows:Loading1 2 1060.2NLoading2 2 5061.0NThe specimen and needle are heated at either of two permis-sible rates,as follows:RateA
11、2 5065C/hRateB 2 120610C/hThe temperature at which the needle has penetrated to adepth of 1 6 0.01 mm is recorded as the Vicat softeningtemperature.5.Significance and Use5.1 Data obtained by this test method is used to compare theheat-softening qualities of thermoplastic materials.1This test method
12、is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.30 on Thermal Properties(Section D20.30.07).Current edition approved Nov.15,2009.Published December 2009.Originallyapproved in 1958.Last previous edition approved in 2007 as D1525-07.DOI:1
13、0.1520/D1525-09.2For 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.3The last approved version of this historical stan
14、dard is referenced onwww.astm.org.4Available 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
15、,PA 19428-2959.United States1 5.2 This test method is useful in the areas of quality control,development,and characterization of plastic materials.6.Apparatus6.1 The instrument shall have a heating system consisting ofa heated bath(see Fig.1)or a contact heating system(see Fig.2):The equipment shall
16、 be constructed essentially as shown inand shall consist of the following:6.1.1 Immersion BathAn immersion bath containing theheat-transfer medium shall be equipped with an agitationsystem,temperature-measuring device,and heater.The heatershall have automatic control of the selected bath temperature-rise rate(see 4.1).The bath should be constructed to allow thespecimens to be submerged at least 35 mm below the surfaceof the heat-transfer medium.6.1.1.1 Heat-Transfer MediumShall be a liquid or fl
