ASTM_D_6606_-_00_2010.pdf

Designation:D660600(Reapproved 2010)Standard Test Method forViscosity and Yield of Vehicles and Varnishes by the DukeViscometer1This standard is issued under the fixed designation D6606;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 procedure for determiningthe viscosity of varnishes,ink vehicles,and similar liquids thatare essentially nonvolatile and unreactive under ordinary roomconditions using the DukeAutomated high-shear rod and collarviscometer.21.2 The instrument in this test method is similar in principleto the falling-rod viscometer described in Test Method D4040except that the collar is motor driven and the range of availableshear stresses is considerably greater.This instrument iscapable of measured and extrapolated viscosity and yieldvalues provided the proper model is chosen for the givenapplication.See Section 6 for the ranges of specified models.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,that may be associated with its use.Itis the responsibility of the user of this standard to establish anyappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D4040 Test Method for Rheological Properties of PastePrinting and Vehicles by the Falling-Rod Viscometer3.Terminology3.1 DefinitionsTerms relative to this test method aredefined in Test Method D4040 except for those found in 3.2.3.2 Definitions of Terms Specific to This Standard:3.2.1 yield value,nThe Lehmans yield value that isdefined as the stress at 2.5 s1.3.2.1.1 DiscussionThis value can be either extrapolated ormeasured.3.2.2 shortness ratio,na ratio to determine the shortnesscharacteristic of the fluid where SR=yield value/apparentviscosity.4.Summary of Test Method4.1 This automated test method is based upon accuratemeasurement of the force that is transferred at a knowntemperature into a stationary vertical rod as a fluid such asprinting ink/varnish moves through a precision measurementgap formed between the outside diameter of the rod and theinside diameter of collar of specific geometry as said collarmoves upward along the length of the rod at specifiedvelocities.4.2 The operator of the instrument and the customer mustagree on the preprogrammed test sequence,which is to be runfor a given material and the desired test temperature.Supervi-sory personnel should know the specifics of each prepro-grammed test sequence,how to change a given test sequence,and how to make a new test sequence.4.3 This test method provides actual measured test data offluids at specified shear rates,which can be programmed torelate.In addition to actual measured data,extrapolated datausing the“power law mathematical model”is provided thatcorrelates with manual testing methods as outlined in TestMethod D4040.4.4 Specified test reference temperatures can range from 20to 40C.Allowable deviation from desired test referencetemperature could be specified differently in each test se-quence.Allowable programmable is within the range of 0.05 to0.4C.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.37 on Ink Vehicles.Current edition approved Dec.1,2010.Published December 2010.Originallyapproved in 2000.Last previous edition approved in 2005 as D6606 00(2005).DOI:10.1520/D6606-00R10.2The sole source of supply of an automated high shear rod and collar viscometerknown to the committee at this time is Duke Custom Systems,Inc.,Pleasant View,TN.If you are aware of alternative suppliers,please provide this information toASTM International Headquarters.Your comments will receive careful consider-ation at a meeting of the responsible technical committee,1which you may attend.3For 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 5.Significance and Use5.1 Actual direct measurements of apparent viscosity andstress at shear rates of interest can be useful in the practicalcontrol of ink viscosity during production and the specificationacceptance between supplier and purchaser.5.2 Use of the Duke automated viscometer provides directmeasurements for viscosity and yield value versus extrapolat-ing data points that may be far from the desired shear rates.6.Appar