ASTM_D_2743_-_68_2010.pdf

Designation:D274368(Reapproved2010)Standard Practices forUniformity of Traffic Paint Vehicle Solids by Spectroscopyand Gas Chromatography1This standard is issued under the fixed designation D2743;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 practices provide general information on theinstrumental techniques available for detecting adulteration ornonuniformity of the chemical nature of the vehicle solids inpurchased lots of traffic paints by means of the individual orcombined use of infrared and ultraviolet spectroscopy and gaschromatography.The procedures given are applicable whentraffic paint is selected and purchased on the basis of pre-qualification laboratory or road performance tests,or both,anda reference sample of the original paint so evaluated andselected is retained and compared with test samples represen-tative of subsequent purchased and delivered lots of such paintand which are required to be the same as the original referencesample.1.2 Although not specifically provided for in thesepractices,the methods given may also be applied,withappropriate modification,to evaluating the acceptability oftraffic paints that have been purchased on the basis of compo-sition specifications.In such cases,application is limited to thevehicle solids as before,as well as the availability of a suitablestandard or range of standards representative of the vehiclesolids that are acceptable and with which samples of subse-quent delivered lots will be compared.1.3 The techniques provided are wholly adequate for detect-ing gross adulteration of the vehicle solids where completelydifferent drying oils,resins,or polymers,or combinations ofthese have been substituted for those originally contained in thereferencesample.Incasesoflesseradulterationormodification,these methods have been found adequate fordetecting vehicle solids,adulterations,or modifications as lowas 5 weight%of the vehicle solids.1.4 These techniques have been developed on the basis ofcooperative work with alkyd,chlorinated rubber-alkyd,andpoly(vinyl toluene)type paints involving the detection ofnonuniformity when such extraneous materials as rosin,fishoil,hydrocarbon resin,and chlorinated paraffin have beenadded.The procedures given may be,but are not necessarilycompletely applicable to all other types of vehicle solids orextraneous additions,or both.1.5 The methods provided appear in the following order:SectionMethod AInfrared Spectral Analysis of Total Vehicle Solids10-12Method BInfrared Spectral Analysis of Unsaponifiable Matterfrom Vehicle Solids13-15Method CGas Chromatographic Analysis of Oils and Oil AcidsSeparated from Vehicle Solids16-18Method DUltraviolet Spectral Analysis of Total Vehicle Solids19,20,and211.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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:2D1259 Test Methods for Nonvolatile Content of ResinSolutionsD1397 Test Method for Unsaponifiable Matter in AlkydResins and Resin Solutions(Withdrawn 2007)3D2245 Test Method for Identification of Oils and Oil Acidsin Solvent-Reducible PaintsD2372 Practice for Separation of Vehicle From Solvent-Reducible PaintsD2621 Test Method for Infrared Identification of VehicleSolids From Solvent-Reducible PaintsE105 Practice for Probability Sampling of MaterialsE131 Terminology Relating to Molecular Spectroscopy1These practices are under jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and are the direct responsibility ofSubcommittee D01.44 on Traffic Coatings.Current edition approved Dec.1,2010.Published December 2010.Originallyapproved in 1968.Last previous edition approved in 2004 as D2743 68(2004)DOI:10.1520/D2743-68R10.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesNOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information13.Terminology3.1 For definitions of terms and symbols,refer to Terminol-ogy E131.4.Summary of Methods4.1 Each of the methods