Designation:D2743−68(Reapproved2010)StandardPracticesforUniformityofTrafficPaintVehicleSolidsbySpectroscopyandGasChromatography1ThisstandardisissuedunderthefixeddesignationD2743;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesepracticesprovidegeneralinformationontheinstrumentaltechniquesavailablefordetectingadulterationornonuniformityofthechemicalnatureofthevehiclesolidsinpurchasedlotsoftrafficpaintsbymeansoftheindividualorcombineduseofinfraredandultravioletspectroscopyandgaschromatography.Theproceduresgivenareapplicablewhentrafficpaintisselectedandpurchasedonthebasisofpre-qualificationlaboratoryorroadperformancetests,orboth,andareferencesampleoftheoriginalpaintsoevaluatedandselectedisretainedandcomparedwithtestsamplesrepresen-tativeofsubsequentpurchasedanddeliveredlotsofsuchpaintandwhicharerequiredtobethesameastheoriginalreferencesample.1.2Althoughnotspecificallyprovidedforinthesepractices,themethodsgivenmayalsobeapplied,withappropriatemodification,toevaluatingtheacceptabilityoftrafficpaintsthathavebeenpurchasedonthebasisofcompo-sitionspecifications.Insuchcases,applicationislimitedtothevehiclesolidsasbefore,aswellastheavailabilityofasuitablestandardorrangeofstandardsrepresentativeofthevehiclesolidsthatareacceptableandwithwhichsamplesofsubse-quentdeliveredlotswillbecompared.1.3Thetechniquesprovidedarewhollyadequatefordetect-inggrossadulterationofthevehiclesolidswherecompletelydifferentdryingoils,resins,orpolymers,orcombinationsofthesehavebeensubstitutedforthoseoriginallycontainedinthereferencesample.Incasesoflesseradulterationormodification,thesemethodshavebeenfoundadequatefordetectingvehiclesolids,adulterations,ormodificationsaslowas5weight%ofthevehiclesolids.1.4Thesetechniqueshavebeendevelopedonthebasisofcooperativeworkwithalkyd,chlorinatedr...
