1、Designation:D496020Standard Test Method forEvaluation of Color for Thermoplastic Pavement MarkingMaterials1This standard is issued under the fixed designation D4960;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last rev
2、ision.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 describes the instrumental determina-tion of color of thermoplastic pavement marking materialsusing the CIE Y,x,y
3、color measurement system.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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 stan
4、dard 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
5、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 Mar
6、k-ing MaterialsD7308 Practice for Sample Preparation of ThermoplasticPavement Marking MaterialsE179 Guide for Selection of Geometric Conditions forMeasurement of Reflection and Transmission Propertiesof MaterialsE284 Terminology of AppearanceE308 Practice for Computing the Colors of Objects by Using
7、the CIE SystemE313 Practice for Calculating Yellowness and WhitenessIndices from Instrumentally Measured Color CoordinatesE1164 Practice for Obtaining Spectrometric Data for Object-Color EvaluationE1347 Test Method for Color and Color-Difference Mea-surement by Tristimulus ColorimetryE1349 Test Meth
8、od for Reflectance Factor and Color bySpectrophotometry Using Bidirectional(45:0 or 0:45)GeometryF412 Terminology Relating to Plastic Piping Systems3.Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology D883,E284,and F412,unless otherwise indicated.3.2 Definitions of Terms Speci
9、fic to This Standard:3.2.1 thermochromism,na change in color that takes placein the thermoplastic material with temperature changes.3.2.2 thermoplastic pavement marking material,nahighly filled 100%total solids material that when heated to amolten state can be extruded or sprayed onto a pavementsurf
10、ace and when cooled forms a solid,durable delineator.4.Summary of Test Method4.1 The test specimen,representative of the material to betested,is taken from a molten sample obtained in accordancewith Practice D7307.The thermoplastic specimen is preparedby pouring into a TFE-fluorocarbon coated pan,to
11、 form a pattyof approximately 7.6 cm(3 in.)in diameter.The patty isallowed to cool to room temperature before measuring thecolor.Color measurements are made on the flat side or the topside of the thermoplastic patty.NOTE1No significant color differences are encountered in reading thetop or bottom of
12、 the patty.5.Significance and Use5.1 This test method provides a standard procedure for thedetermination of color of thermoplastic pavement markingmaterials.This test method can be used in conjunction withvarious thermoplastic pavement marking specifications to de-termine compliance of the material
13、to said specification.Thismethod can also be used by manufacturers of these materials 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
14、 approved July 1,2020.Published July 2020.Originally approvedin 1989.Last previous edition approved in 2013 as D4960 08(2013).DOI:10.1520/D4960-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards vo
15、lume 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 standardi
16、zation 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.determine the uniformity of thermoplastic pavement markingmaterials from batch to batch.5.2 There is a slight variation in color standards andcolorimeters.This test method is only applicable when resultsare reported with information listing the instrument modeldesignation and calibration standard
