1、Designation:F766/F766M82(Reapproved 2010)1Standard Test Method forMelting Point of Waxes1This standard is issued under the fixed designation F766/F766M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A numbe
2、r in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEUnits information was editorially revised in December 2010.1.Scope1.1 This test method covers the determination of the initialand final melting point
3、s and recovery point of waxes using ahot stage and microscope.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalu
4、es from the two systems may result in non-conformancewith the standard.1.3 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 and health practices and determine the a
5、pplica-bility of regulatory limitations prior to use.See Section 8 for aspecific precautionary statement.2.Referenced Documents2.1 ASTM Standards:2E105 Practice for Probability Sampling of MaterialsE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Charac
6、teristic of aLot or Process3.Descriptions of Terms Specific to This Standard3.1 final melting pointthe temperature in degrees celsiusobserved on the hot-stage thermometer at the time the wax iscompletely melted into droplets.3.2 initial melting pointthe temperature in degrees celsiusobserved on the
7、hot-stage thermometer at the time the firstmovement is noted in the wax.3.3 recovery pointthe temperature in degrees celsius ob-served on the hot-stage thermometer at the time the first crystalis observed forming in the melted wax during cooling.4.Summary of Test Method4.1 A few shavings or granules
8、 from representative waxsample are placed on a microscope slide and covered with acover glass.The slide assembly is set up on the hot stage withthe microscope lighted and focused for best viewing.The hotstage is heated rapidly at first and then adjusted so that itstemperature will increase approxima
9、tely 2C/min during thelast 10C preceding the expected melting point.The waxshavings or granules are observed through the microscope,andthe temperature at which first movement of wax is noted isrecorded as initial melting point.The temperature at the timethe wax is observed to be completely melted is
10、 recorded as thefinal melting point.The hot stage is slowly cooled and thetemperature at which the first crystal appears in the melted waxis recorded as the recovery point.The recorded temperaturesare adjusted,where applicable,by appropriate temperaturecorrection factors.5.Significance and Use5.1 Th
11、is test method determines the initial melting point andmelting range of waxes.The data obtained are important in theapplication of waxes in one-time carbon inks.6.Apparatus6.1 Controlled Micro Hot Stage and Microscope,40 to 50power or suitable alternative.6.2 Microscope Slides,1 by 112in.6.3 No.2 Co
12、ver Slides(glasses),18 mm square.1This test method is under the jurisdiction ofASTM Committee F05 on BusinessImaging Products and is the direct responsibility of Subcommittee F05.02 on InkedTransfer Imaging Products.Current edition approved Oct.1,2010.Published December 2010.Originallyapproved in 19
13、82.Last previous edition approved in 2005 as F766 82(2005).DOI:10.1520/F0766_F0766M-82R10E01.2For 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 Summa
14、ry page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.Materials7.1 Test Reagent Set,containing substances with knownmelting points for checking the accuracy of the hot-stagethermometer3.8.Precautions8.1 Not all waxe
15、s exhibit a uniform flow.Some waxesexhibit a sharp initial flow while others may exhibit a slower,gradual plastic flow.9.Sampling9.1 Ensure that the sample represents the material tested andthat the portion of the test sample is representative of the wholesample.(Practices E122 and E105.)9.2 Prepare
16、 sufficient wax to give 10 6 2 mg of sample foreach melting point determination.Brittle wax(such as car-nauba)is prepared by grinding the sample in a mortar andpestle or other suitable means and passing the wax through a200-mesh sieve.Non-brittle wax(such as paraffin)is preparedby shaving off a few small particles with a razor or other sharpinstruments.10.Calibration10.1 Check the hot-stage apparatus and thermometer regu-larly with test reagents having known melting points.To ensuremaximum accur
