ASTM_D_5018_-_89_2015e1.pdf

Designation:D501889(Reapproved 2015)1Standard Test Method forShear Viscosity of Coal-Tar and Petroleum Pitches1This standard is issued under the fixed designation D5018;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.1NOTESI units formatting was corrected editorially in May 2015.1.Scope1.1 This test method covers the determination of the appar-ent shear viscosity of coal-tar and petroleum-based pitcheshaving a Mettler softening point(SP)range of approximately95 C to 120 C.1.2 This test method is applicable only for rotational vis-cometers.1.3 Since this test method is based on theoretical grounds,strict adherence to details of the procedure is necessary tocomply with the theoretical requirements.1.4 The values stated in SI units are to be regarded asstandard.1.4.1 ExceptionThe values stated in conventional units(centipoise)are to be regarded as the standard for viscositymeasurement only.The SI unit is the pascal second(Pas)andone millipascal second(mPas)=one centipoise(cps);centi-poise is in cgs units.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 this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Specific hazardstatements are given in Section 7.2.Referenced Documents2.1 ASTM Standards:2D4296 Practice for Sampling PitchE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Method3.1 The viscosity of a pitch,over the temperature range ofabout 40 C to 100 C above the SP of the material,isdetermined using a rotational viscometer.3.2 The recommended specifications herein are for measur-ing the apparent shear viscosity of binder pitches via aconcentric cylinder viscometer.Apparent shear viscosity is theratio of shear stress to shear rate in a unidirectional simpleshear flow field at steady state conditions.A concentriccylinder viscometer is useful for measuring the apparent shearviscosity,provided the sample temperature is adequatelycontrolled,the“end-effects”are negligible,and the gap be-tween rotor/cup is small and remains constant during the test.The extrapolated value of apparent shear viscosity at“zero”shear rate is called shear viscosity.4.Significance and Use4.1 This test method is useful as one element in establishingthe uniformity of shipments.4.2 Viscosity is also valuable for rheological characteriza-tion of binder pitches.Binder pitch imparts consistency to1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricantsand is the direct responsibility ofSubcommittee D02.05 on Properties of Fuels,Petroleum Coke and Carbon Material.Current edition approved April 1,2015.Published May 2015.Originallyapproved in 1989.Last previous edition approved in 2009 as D5018 89(2009).DOI:10.1520/D5018-89R15E01.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 carbonaceous mixes and affects their resistance to deformation.Binder pitch viscosity is important for assessing mix consis-tency and for evaluating the ease of mix extrusion or moldinginto artifacts.5.Apparatus5.1 ViscometerArotational viscometer capable of measur-ing viscosity in the range of about 5 cps to 15 000 cps;theviscometer should be equipped with the appropriate accesso-ries to allow measurements up to about 230 C.Two viscom-eters meeting these requirements are the LVT,LVF,3orequivalent,and the RV100,RV20,4or equivalent.5.2 Sample Temperature Control System Any device ca-pable of maintaining the sample test temperature within limitsof 61.0 C while allowing viscosity measurements.Examplesare the Thermosel System3and the TP 245with heater.5.3 ThermometerASTM precision thermometer 2C,hav-ing a range of 5 C to 300 C.5.4 Hot Plate5Any hot plate with adjustable temperaturecontrol and surface temperature indication(to prevent sampleoverheating).5.5 Calibration Fluids6A series of calibrated fluids thatcover the viscosity range of approximately 100 cps to15 000 cps at temperatures up to 150 C.6.Reagents and Materials6.1 Cleaning SolventAny solvent capable of dissolvingpitch,(suitable solvents are quinoline or creosote oils).6.2 Rinsing SolventsToluene and acetone are used forfinal rinsing after initial cleaning.7.Safety Hazards7.1 Fumes of hot pitch or solvents,or both,should beremoved from all working areas by means of proper hoods.Theworking