Designation:D2621−87(Reapproved2016)StandardTestMethodforInfraredIdentificationofVehicleSolidsFromSolvent-ReduciblePaints1ThisstandardisissuedunderthefixeddesignationD2621;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthequalitativecharacterizationoridentificationofseparatedpaintvehiclesolidsbyinfraredspectroscopywithinthelimitationsofinfraredspectroscopy.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1467GuideforTestingFattyAcidsUsedinProtectiveCoatings(Withdrawn2003)3D1962TestMethodforSaponificationValueofDryingOils,FattyAcids,andPolymerizedFattyAcids(Withdrawn2004)3D2372PracticeforSeparationofVehicleFromSolvent-ReduciblePaintsE131TerminologyRelatingtoMolecularSpectroscopyE275PracticeforDescribingandMeasuringPerformanceofUltravioletandVisibleSpectrophotometers3.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsandsymbols,refertoTermi-nologyE131.4.SummaryofTestMethod4.1Infraredspectraarepreparedfromdriedfilmsofisolatedpaintvehicles.Vehicletypesareidentifiedbycomparingthespectratoacollectionofreferenceinfraredspectra.5.SignificanceandUse5.1Theabilitytoqualitativelyidentifypaintvehiclesisusefulforcharacterizingunknownorcompetitivecoatings,forcomplaintinvestigations,andforin-processcontrol.6.Apparatus6.1Spectrophotometer—Arecordingdouble-beaminfraredspectrophotometerwithawavelengthrangefromatleast2.5to15µmandaspectralresolutionofatleast0.04µmoverthatrange.SeePracticeE275.6.2DemountableCellMount,withNaClwindow.6.3VacuumDryingOventhermostaticallycontrolledtooperateat6062°C.Awateraspiratorvacuu...
