ASTM_D_6090_-_12.pdf

Designation:D609012Standard Test Method forSoftening Point Resins(Mettler Cup and Ball Method)1This standard is issued under the fixed designation D6090;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.1.Scope1.1 This test method covers the determination of softeningpoint of resins using a Mettler cup and ball apparatus,and may,under user-defined conditions,give results comparable to thoseobtained by Test Methods E28.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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 applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E28 Test Methods for Softening Point of Resins Derivedfrom Pine Chemicals and Hydrocarbons,by Ring-and-Ball ApparatusE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Method3.1 In this test method,the softening point is defined as thetemperature at which the sample,suspended in a cylindricalcup with a 6.35-mm hole in the bottom and with a stainlesssteel ball,8 mm in diameter,centered on top of the sample inthe cup,flows downward a distance of 19 mm to interrupt alight beam,as the sample is heated at a linear rate in air.4.Significance and Use4.1 In general,with materials of these types,softening pointdoes not take place at a definite temperature.As the tempera-ture rises,these materials gradually change from brittle orexceedingly thick and slow-flowing materials to softer and lessviscous liquids.For this reason,the determination of thesoftening point must be made by a fixed,arbitrary,and closelydefined method if the results obtained are to be comparable.5.Apparatus5.1 Softening Point Apparatus3This commercially avail-able instrument consists of a control unit with a digitaltemperature indicator;matched measuring cell;cartridgeassembly,consisting of a sample cup and upper portion;andaccessories.The control unit automatically regulates the heat-ing rate of the measuring cell.The softening point is indicatedon the readout,and the heating program stopped,when thesample flow triggers a photocell detector.5.2 CentralProcessorThisunitshallprovideacontinuous,linear temperature increase from 25 to 375C.5.3 Measuring CellThis unit shall be capable of heating asample cup assembly,as described in 5.4,at a linear rate withan accuracy of 60.2C/min.It shall include a sensing systemcapable of detecting the softening point with a precision of0.1C.5.4 Sample Cup AssemblyAcup of chromium-plated brassand an upper portion,conforming to the dimensions shown inFig.1.5.5 BallA stainless steel ball,8.7 mm(1132in.)indiameter,weighing 2.77 6 0.02 g.6.Calibration of Apparatus Using a Primary Standard6.1 This step,required only occasionally,is designed toestablish that the temperature indicated by the instrument is inagreement with a known standard.A special cup with a bottomorifice of 2.8 mm is used instead of the one specified for testingthe resin.NOTE1The stainless steel ball is not used during calibration.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.34 on Pine Chemicals and Hydrocarbon Resins.Current edition approved Nov.1,2012.Published December 2012.Originallyapproved in 1997.Last previous edition approved in 2008 as D6090 99(2008).DOI:10.1520/D6090-12.2For 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 sole source of supply of the apparatus FP90/FP83HT,known to thecommittee at this time is the Mettler-Toledo,Inc.,Princeton-Hightstown Rd.,Hightstown,NJ 08520.If you are aware of alternative suppliers,please provide thisinformation to ASTM International Headquarters.Your comments will receivecareful consideration at a meeting of the responsible technical committee,1whichyou may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.2 ReagentUse either analytical reagent or primary stan-dard grade benzoic acid for the calibration.As this material ishygroscopic,it must be stored in a tightly sealed container,andreplaced with fresh material from a newly opened supply ifhydration or other contamination is suspected.6.3 Procedure:6.3.1 Fi