ASTM_D_5125_-_10_2020e1.pdf

Designation:D512510(Reapproved 2020)1Standard Test Method forViscosity of Paints and Related Materials by ISO Flow Cups1This standard is issued under the fixed designation D5125;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.1NOTEAn editorial change was made in 10.2.2 in December 2020.1.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 D2196 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 asstandard.The values given in parentheses are for informationonly.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.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational ViscometerD3924 Specification for Standard Environment for Condi-tioning and Testing Paint,Varnish,Lacquer,and RelatedMaterialsD3925 Practice for Sampling Liquid Paints and RelatedPigmented CoatingsE1 Specification for ASTM Liquid-in-Glass Thermometers2.2 ISO Documents:ISO 2431 Paints and Varnishes:Determination of Flow Timeby 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&Paint Materials.Current edition approved Dec.1,2020.Published December 2020.Originallyapproved in 1991.Last previous edition approved in 2014 as D5125 10(2014).DOI:10.1520/D5125-10R20E01.2An 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(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by th