ASTM_D_8424_-_21.pdf

Designation:D842421Standard Guide forRetroreflective Composite Optics Laboratory Procedures1This standard is issued under the fixed designation D8424;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 guide presents a series of options for evaluatinglot-to-lot consistency of retroreflective composite optics of thesame type and form from the same manufacturer and does notrecommend any specific course of action to be taken.Thisguide is meant to increase the awareness of information andapproaches and is not meant to recommend any specific courseof action per ASTMs Form and Style for ASTM Standardsdefinition for a Guide.1.1.1 This guide does not determine lab procedure selectionor acceptance criteria for a specific retroreflective compositeoptics product for its intended use.It is the responsibility of themanufacturer and customer to negotiate these details based ontheir specific needs.1.1.2 This guide is not intended to predict in-service perfor-mance levels.1.1.3 This guide is not intended for comparison of differenttypes of composite optics or manufacturers of compositeoptics.1.2 UnitsThe values stated in SI units are to be regardedas standard.The values given in parentheses after SI units areprovided for information only and are not considered standard.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:2C702 Practice for Reducing Samples ofAggregate to TestingSizeD1921 Test Methods for Particle Size(Sieve Analysis)ofPlastic MaterialsD2486 Test Methods for Scrub Resistance of Wall PaintsD7428 Test Method for Resistance of Fine Aggregate toDegradation by Abrasion in the Micro-Deval ApparatusE1349 Test Method for Reflectance Factor and Color bySpectrophotometry Using Bidirectional(45:0 or 0:45)GeometryE1710 Test Method for Measurement of RetroreflectivePavement Marking Materials with CEN-Prescribed Ge-ometry Using a Portable Retroreflectometer2.2 AASHTO Standards:3AASHTO TP-130-18 Producing Draw Down Panels andMeasuring the Coefficient of Retroreflected Luminance(RL)of Pavement Markings in a Laboratory Panel3.Terminology3.1 Definitions:3.1.1 installed pavement markings,npavement markingsapplied to a road surface for the purpose of guiding traffic.3.1.2 pavement marking material,na pigmented bindersystem used for lane delineation for highways,parking lots,and other areas subject to vehicular traffic;applicable pave-ment marking materials include waterborne traffic paint,sol-vent borne traffic paint,thermoplastic,plural component suchas epoxy,modified epoxy,polyurea,and methyl methacrylate.3.1.3 pavement marking sample,na properly cured pave-ment marking of specified width,length,and thickness appliedto an appropriate,substrate panel;the pavement marking has1This guide is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.44 on Traffic Coatings.Current edition approved Nov.1,2021.Published December 2021.DOI:10.1520/D8424-21.2For 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 Association of State Highway and TransportationOfficials(AASHTO),444 N.Capitol St.,NW,Suite 249,Washington,DC 20001,http:/www.transportation.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 the World Trade Organization Technical Barriers to Trade(TBT)Committee.1?drop-on particles embedded in the surface of the marking toprovidevariousperformancecharacteristicssuchasretroreflectivity,color,and skid resistance.3.1.3.1 DiscussionFor the purpose of measuring retrore-flectivity after scrubbing procedures in this document,the sizeof the scrub area of the pavement marking sample needs tomeet or exc