ASTM_D_4956_-_19.pdf

Designation:D495619Standard Specification forRetroreflective Sheeting for Traffic Control1This standard is issued under the fixed designation D4956;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers flexible,non-exposed glass-bead lens and microprismatic,retroreflective sheeting designedfor use on traffic control signs,delineators,barricades,andother devices.This specification does not address inks,overlays,or other imaging methods that may be applied toretroreflective sheeting material to create traffic signs or otherdevices.1.2 Although this specification provides photometric re-quirements for retroreflective sheeting under evaluation,mini-mum performance requirements of in-service signs or otherdevices are outside the scope of this document.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 The following safety hazards caveat pertains only to thetest methods portion,Section 7,of this specification.Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety,health,andenvironmental practices and determine the applicability ofregulatory limitations prior to use.1.5 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:2B209 Specification for Aluminum and Aluminum-AlloySheet and PlateB209M Specification for Aluminum and Aluminum-AlloySheet and Plate(Metric)B449 Specification for Chromates on AluminumD2794 Test Method for Resistance of Organic Coatings tothe Effects of Rapid Deformation(Impact)E284 Terminology of AppearanceE308 Practice for Computing the Colors of Objects by Usingthe CIE SystemE808 Practice for Describing RetroreflectionE810 Test Method for Coefficient of Retroreflection ofRetroreflective Sheeting Utilizing the Coplanar GeometryE811 Practice for Measuring Colorimetric Characteristics ofRetroreflectors Under Nighttime ConditionsE991 Practice for Color Measurement of Fluorescent Speci-mens Using the One-Monochromator MethodE1164 Practice for Obtaining Spectrometric Data for Object-Color EvaluationE1247 Practice for Detecting Fluorescence in Object-ColorSpecimens by SpectrophotometryE1347 Test Method for Color and Color-Difference Mea-surement by Tristimulus ColorimetryE1349 Test Method for Reflectance Factor and Color bySpectrophotometry Using Bidirectional(45:0 or 0:45)GeometryE2152 Practice for Computing the Colors of FluorescentObjects from Bispectral Photometric DataE2153 Practice for Obtaining Bispectral Photometric Datafor Evaluation of Fluorescent ColorE2301 Test Method for Daytime Colorimetric Properties ofFluorescent Retroreflective Sheeting and Marking Mate-rials for High Visibility Traffic Control and PersonalSafety Applications Using 45:Normal GeometryE3165 Test Method for Nighttime Retroreflected Chromatic-ity of Retroreflective SheetingG7/G7M Practice for Atmospheric Environmental ExposureTesting of Nonmetallic MaterialsG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG147 Practice for Conditioning and Handling of Nonmetal-lic Materials for Natural and Artificial Weathering Tests1This specification is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.38 onHighway Traffic Control Materials.Current edition approved July 1,2019.Published July 2019.Originally approvedin 1989.Last previous edition approved in 2017 as D4956 17.DOI:10.1520/D4956-19.2For 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.1 G151 Practice for Exposing Nonmetall