1、Designation:D 2743 68(Reapproved 2004)Standard Practices forUniformity of Traffic Paint Vehicle Solids by Spectroscopyand Gas Chromatography1This standard is issued under the fixed designation D 2743;the number immediately following the designation indicates the year oforiginal adoption or,in the ca
2、se of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 These practices provide general information on theinstrumental techniques available for detecti
3、ng 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
4、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
5、 the original referencesample.1.2 Although not specifically provided for in these prac-tices,the methods given may also be applied,with appropriatemodification,to evaluating the acceptability of traffic paintsthat have been purchased on the basis of composition specifi-cations.In such cases,applicat
6、ion is limited to the vehiclesolids 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 dete
7、ct-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 thereference sample.In cases of lesser adulteration or modifica-tion,these methods have been found adequate for det
8、ectingvehicle solids,adulterations,or modifications as low as 5weight%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 mate
9、rials 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
10、 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 Th
11、is 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.
12、1 ASTM Standards:2D 1259 Test Methods for Nonvolatile Content of ResinSolutionsD 1397 Test Method for Unsaponifiable Matter in AlkydResins and Resin SolutionsD 2245 Test Method for Identification of Oils and OilAcidsin Solvent-Reducible PaintsD 2372 Practice for Separation of Vehicle from Solvent-Re
13、ducible PaintsD 2621 Test Method for Infrared Identification of VehicleSolids from Solvent-Reducible PaintsE 105 Practice for Probability Sampling of MaterialsE 131 Terminology Relating to Molecular Spectroscopy3.Terminology3.1 For definitions of terms and symbols,refer to Terminol-ogy E 131.1These
14、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 June 1,2004.Published June 2004.Originallyapproved in 1968.Last previous edition approve
15、d in 1998 as D 2743 68(1998)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.1Copyright ASTM International,100 Barr
16、 Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.4.Summary of Methods4.1 Each of the methods given requires both a reference anda test sample of traffic paint and a preliminary separation andremoval of the pigment component in each.4.2 Method A involves infrared spectral analysis of castfilms of the total vehicle solids to detect spectral differencesbetween the reference and test samples caused by gross orminor adulteration of the test sample.4.3 Method B involves infrared