ASTM_D_8162_-_20a.pdf

Designation:D816220aStandard Test Method forDetermination of the Apparent Viscosity of ThermoplasticPavement Marking Materials using a Rotational Viscometerwith Temperature Control Heating Unit1This standard is issued under the fixed designation D8162;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 sample preparation andtesting procedure needed to determine the apparent viscosity ofa thermoplastic pavement marking formulation at elevatedtemperatures to the specimen.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses after SI units arecustomary units and are provided as a courtesy to the user.1.3 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.1.4 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:2D883 Terminology Relating to PlasticsD7307 Practice for Sampling of Thermoplastic Traffic Mark-ing MaterialsD7308 Practice for Sample Preparation of ThermoplasticPavement Marking MaterialsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE284 Terminology of AppearanceE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE2975 Test Method for Calibration or Calibration Verifica-tion of Concentric Cylinder Rotational Viscometers3.Terminology3.1 The terms and definitions in Terminology D883 andTerminology E284 apply to this test method.3.2 Definitions of Terms Specific to This Standard:3.2.1 apparent viscosity,nthe viscosity determined by thistest method can be expressed in millipascal seconds,Centipoise,and Poise.Common viscosity units of Poise(P)arerelated to the SI units by the equivalency 1 cP=1 mPas.3.2.1.1 DiscussionAn apparent viscosity value may varywith the spindle and rotational speed elected for measuringnon-Newtonian materials.3.2.2 thermoplastic pavement marking(material),nahighly filled 100%total solids highway marking system thatwhen heated to a molten state can be extruded or sprayed ontoa road surface.Retroreflective optics are applied(dropped on)to the surface of the molten marking immediately afterapplication to provide,when cooled,a solid durable delineatoror thermoplastic pavement marking usually melted to 218C(425F)3.2.3 viscosity,nthe ratio of shear stress to shear rate.3.2.3.1 DiscussionThe viscosity of a liquid is a measureof the resistance to flow of the liquid.The SI unit of dynamicviscosity is the pascal second.For a Newtonian liquid,theviscosity is constant at all shear rates.For a non-Newtonianliquid,viscosity will vary depending on shear rate.4.Summary of Test Method4.1 This viscosity method is used to determine the apparentviscosity of thermoplastic pavement marking products atelevated temperatures.Apparent viscosity is determined undertemperature equilibrium conditions using a rotating spindletype viscometer.The torque on a spindle rotating in atemperature-controlled sample holder containing a smallamount of sample is used to measure the relative resistance to1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.44 on Traffic Coatings.Current edition approved Sept.1,2020.Published September 2020.Originallyapproved in 2020.Last previous edition approved in 2020 as D8162 20.DOI:10.1520/D8162-20A.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 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 the World Trade Organization Technical Barriers to Trade(TBT)Committee.1rotation.A factor is applied to the torque reading to yield theviscosity in mPas(cP or Poise).5.Significance and Use5.1 This test method is used to measure the apparentviscosity of thermoplastic pavement mark