ASTM_D_4956_-_13.pdf

Designation:D495613Standard 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 glassbead lens and microprismatic,retroreflective sheeting designedfor use on traffic control signs,delineators,barricades,andother devices.1.2 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.1.3 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 and healthpractices and determine the applicability of regulatory limita-tions prior to use.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 AluminumE284 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 GeometryG7 Practice for Atmospheric Environmental Exposure Test-ing 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 TestsG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG155 Practice for Operating Xenon Arc Light Apparatus forExposure of Non-Metallic Materials2.2 Other StandardsISO 4892-2:2006 Plastics Methods of exposure to laboratorylight sources-Part 2:Xenon-arc lampsISO 4892-2:2006/Amd.1:2009 Plastics Methods of expo-sure to laboratory light sources-Part 2:Xenon-arc lampsEN12899-1:2007 Fixed,vertical road traffic signs-Part 1:Fixed signs3.Terminology3.1 DefinitionsDefinitions of terms are as described inTerminology E284,Practice E808,and Terminology G113.3.2 Definitions of Terms Specific to This Standard:1This 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 Dec.15,2013.Published January 2014.Originallyapproved in 1989.Last previous edition approved in 2011 as D4956 11a.DOI:10.1520/D4956-13.2For 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 States1 3.2.1 reboundable sheeting,nretroreflective material in-tended to be attached to flexible impact resistant plasticdevices,such as traffic drum-like channelizing devices.4.Classification4.1 Retroreflective sheeting shall consist of a white orcolored sheeting having a smooth outer surface and thatessentially has the property of a retroreflector over its entiresurface.There are nine types and five classes of retroreflectivesheeting.Types are determined by conformance to theretroreflectance,color,and durability requirements listed in 6.1and may be of any construction providing that those require