ASTM_D_4797_-_12a.pdf

Designation:D479712aStandard Test Methods forGravimetric Analysis of White and Yellow ThermoplasticTraffic Marking1This standard is issued under the fixed designation D4797;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 These test methods cover procedures for the gravimetricanalysis of the binder and hydrochloric Acid(HCL)insolubleparticles in white and yellow thermoplastic traffic markings.The HCL insoluble particles can be retroreflective optics,suchas glass beads or some other type of retroreflective optic,ornon-retroreflective particles such as silica sand,or a combina-tion of any two or more of these materials.1.2 This standard does not address the physical separationand the individual quantification of each component when amixture of two or more HCL insoluble materials is present.Rather it requires the user to visually evaluate the HCLinsoluble material(obtained from following this test method)and report the types of materials present.1.3 This standard does not purport to address the titaniumdioxide or lead chromate pigment measurement(after ashing)which is detailed in Test Methods D1394 and D126.1.4 This standard will attempt to address the interference oforganic pigments with the binder results.1.5 The analytical procedures appear in the following order:SectionsPercent Binder10Percent Retroreflective Optics orNon-Retroreflective Particles111.6 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.7 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D126 Test Methods for Analysis of Yellow,Orange,andGreen Pigments Containing Lead Chromate and Chro-mium Oxide GreenD1394 Test Methods for Chemical Analysis of White Tita-nium PigmentsD7307 Practice for Sampling of Thermoplastic Traffic Mark-ing MaterialsD7308 Practice for Sample Preparation of ThermoplasticTraffic Marking MaterialsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 ash,nthe inorganic components of thermoplastictraffic marking including the pigment,glass spheres,and filler.3.1.2 binder,nthe organic components(resinous compo-nents)of thermoplastic traffic marking that bind the pigments,glass spheres,and filler together as a unit.3.1.3 filler,nthe inorganic components of thermoplastictraffic marking not including the pigments,retroreflectiveoptics,or non-retroreflective particles that are consideredfunctional.3.1.4 retroreflective optic,nfunctional particle that reflectsand returns a relatively high proportion of light in a directionclose to the light source.This characteristic is maintained overa wide variation of the angle made by the incident light ray andnormal to the retroreflective surface.This includes a singlecomponent structure such as a spherical glass bead or a multicomponent structure with a core and a surface covered with asmall retroreflector.3.1.5 non-retroreflective particles,nfunctional particlethat is insoluble in HCL,such as aluminum oxide,ground1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.44 on Traffic Coatings.Current edition approved Nov.1,2012.Published December 2012.Originallyapproved in 1988.Last previous edition approved in 2012 as D4797 12.DOI:10.1520/D4797-12A.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 glass,quartz,etc.,that are added for skid resistance or othernon-retroreflective functional purpose.3.1.6 pigment,ntitaniumdioxide,leadchromatecolorants,and/or organic pigments.3.1.7 thermoplastic,nSee thermoplastic traffc marking.3.1.8 thermoplastic traffc marking,na highly filled100%total solids highway marking system that when heatedto a molten state can be extruded or sprayed onto a road surfaceand when cooled forms a solid durable delineator.3.1.9 hydrochloricacid(HCL)insolubleparticles,nretroreflective optics,such as glass beads or some othertype of retroreflective optic,or non-retroreflective particlessuch as silica