ASTM_D_5125_-_97_2005.pdf

Designation:D 5125 97(Reapproved 2005)Standard Test Method forViscosity of Paints and Related Materials by ISO Flow Cups1This standard is issued under the fixed designation D 5125;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the flowtime(viscosity)of Newtonian and near-Newtonian paints,andrelated coatings and products using ISO capillary flow cups.NOTE1If the liquid is non-Newtonian,that is shear-thinning orthixotropic,Test Methods D 2196 should be used.1.2 The cup-orifice combination(ISO cup with orificediameter of 3 mm,4 mm,5 mm,or 6 mm)2is selected toprovide an efflux time with the range of 20 to 100 s andviscosities up to 700 cSt(700 mm2/s).The most commonlyused cup is the one with the 4-mm orifice.1.3 This test method is limited to testing materials for whichthe breakpoint of the flow from the orifice of the flow cup canbe determined with certainty.This point is difficult to deter-mine and reproduce for materials with flow times in excess of100 s due to slowing-down effects.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.NOTE2The International CivilAviation Organization(ICAO)and theInternational Maritime Organization(IMO)include in their regulations asimilar test(ISO 2431)to determine the viscosity of hazardous viscousliquids.The viscosity is then used to place these liquids in a hazardpackaging group depending on their viscosity/flashpoint relationship.TheU.S.Department of Transportation permits the use of these regulations fortranshipment of hazardous material within the U.S.when bound forforeign destinations.2.Referenced Documents2.1 ASTM Standards:3D 2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational(Brookfield tyoe)Vis-cometerD 3924 Specification for Standard Environment for Condi-tioning and Testing Paint,Varnish,Lacquer,and RelatedMaterialsD 3925 Practice for Sampling Liquid Paints and RelatedPigmented CoatingsE 1 Specifications for ASTM Liquid-in-Glass Thermom-eters2.2ISO Documents:ISO 2431 Paints and Varnishes:Determination of FlowTime by Use of a Flow Cup43.Terminology3.1 Definitions:3.1.1 dynamic viscosity,nthe ratio of the applied shearstress to shear rate.3.1.1.1 DiscussionThe SI unit for dynamic viscosity is thepascal second(Pas).The traditional unit is the centipoise(cP);1 cP=1 mPas.3.1.2 flow time,nthe elapsed time from the moment whenthe material under test starts to flow from the orifice of thefilled cup to the moment when the flow stream of material firstbreaks close to the orifice.3.1.3 kinematic viscosity,nthe ratio of the dynamic vis-cosity to the density of the liquid.3.1.3.1 DiscussionThe SI unit for kinematic viscosity isthe square metre per second(m2/s).The traditional unit is thecentistokes(cSt);1 cSt=1 mm2/s.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.24 on Physical Properties of Liquid Paints and Paint Materials.Current edition approved May 15,2005.Published June 2005.Originallyapproved in 1991.Last previous edition approved in 1997 as D 5125 97.2An ISO-type cup with an orifice diameter of 8 mm is available,but it is notlisted in ISO 2431 and precision and accuracy are not known.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.4Available from American National Standards Institute,11 W.42nd St.,13thFloor,New York,NY 10036.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.3.1.4 near-Newtonian liquid,na liquid in which thevariation of viscosity with shear rate is small and the effect onviscosity of mechanical disturbances such as stirring is negli-gible.3.1.5 Newtonian liquid,na liquid in which the viscosity isindependent of the shear stress or shear rate.Compare non-Newtonian liquid.3.1.6 non-Newtonian liquid,na liquid in which the ratioof shear stress to shear rate is not constant.4.Summary of Test Method4.1 The ISO flow cup is filled level full with the materialunder test that has been conditioned at the specified measuringtemperature(see 10.2.2)and the time for the material to flowthrough one of the standard orifices is determined.