ASTM_D_1824_-_95_2010.pdf

Designation:D182495(Reapproved 2010)Standard Test Method forApparent Viscosity of Plastisols and Organosols at LowShear Rates1This standard is issued under the fixed designation D1824;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.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This test method covers the measurement of plastisoland organosol viscosity at low shear rates.1.2 Apparent viscosity at high shear rates is covered in TestMethod D1823.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 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.NOTE1This test method resembles ISO 3219-1977 in title only.Thecontent is significantly different.2.Referenced Documents2.1 ASTM Standards:2D1755 Specification for Poly(Vinyl Chloride)ResinsD1823 Test Method for Apparent Viscosity of Plastisols andOrganosols at High Shear Rates by Extrusion ViscometerE1 Specification for ASTM Liquid-in-Glass ThermometersE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:ISO 3219-1977:Polymers in the Liquid,Emulsified,orDispersed StateDetermination of Viscosity With a Ro-tational Viscometer Working at a Defined Shear Rate33.Summary of Test Method3.1 The sample is conditioned to the proper temperature andits viscosity is determined.4.Significance and Use4.1 The suitability of a dispersion resin for any givenapplication process is dependent upon its viscosity character-istics.4.2 The viscosity defines the flow behavior of a plastisol ororganosol under low shear.This viscosity relates to theconditions encountered in pouring,casting,molding,anddipping processes.5.Apparatus5.1 Viscometer.45.2 Sample Containers,Tin Cans,or Glass Jars,1-pt(500-mL)capacity.Minimum dimensions of containers shouldbe 80-mm(3.15-in.)inside diameter by 80 mm(3.15 in.)deep.5.3 Thermometer,ASTM Solvents Distillation Thermom-eter having a range from 2 to+52C(28 to 126F)andconforming to the requirements for Thermometer 37C asprescribed in Specification E1.5.4 Timer.6.Conditioning6.1 Maintain the plastisol or organosol samples at 23 6 1C(73 6 2F)and 50 6 5%relative humidity at all times aftermixing and throughout the period of viscosity determinations.7.Procedure7.1 Select a spindle that will read in the middle or upperportion of the viscometer dial at the highest rotational speed tobe used.Insert the spindle into the sample at approximately a45 angle.Withdraw the spindle and attach it to the viscometer.Taking care not to entrap an air bubble,lower the viscometer to1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materi-als.Current edition approved Dec.15,2010.Published March 2011.Originallyapproved in 1961.Last previous edition approved in 2002 as D1824-95(2002).DOI:10.1520/D1824-95R10.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Brookfield model RVF or LVF,or equivalent has been found satisfactory forthis purpose.Brookfield Engnrg.Labs,Inc.,Stoughton,MA 02072.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 immerse the spindle near the edge of the sample.Move thesample so as to center the spindle.Adjust its depth to theimmersion mark.7.2 Start the viscometer at its lowest speed.Allow it to run2 min.Record the scale reading during the next rotation.Without stopping the viscometer,switch to the next higherspeed.Record the scale readings after 2 min at each speed inorder from the lowest to the highest speeds.7.3 Record the sample temperature at the conclusion ofviscosity readings.8.Calculation8.1 Calculate the viscosity using the factors provided withthe viscometer.9.Report9.1 Report the following information:9.1.1 Complete sample identification.9.1.2 Temperature of the sample.9.1.3 Viscometer model and spindle number used for test.9.1.4 Viscosity at each spindle speed used.9.1.5 Sample conditioning time.NOTE2If only one viscosity is to be reported,record as the viscosity,the poises at 20 rpm for Model RVF,or at 60 rpm for Model LVF,togetherwith the aging period,v