Designation:D3733–93(Reapproved1998)StandardTestMethodforSiliconContentofSiliconePolymersandSilicone-ModifiedAlkydsbyAtomicAbsorption1ThisstandardisissuedunderthefixeddesignationD3733;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthesiliconcontentofsiliconepolymersandsiliconemodifiedalkydswhenpresentinthenonvolatileportionofpolymers,resins,orliquidcoatingstotheextentof1%ormore.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityofwhoeverusesthisstandardtoconsultandestablishappropriatesafetyandhealthpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D1153SpecificationforMethylIsobutylKetone2D1193SpecificationforReagentWater3D2372PracticeforSeparationofVehiclefromSolvent-ReduciblePaints4D2698TestMethodforDeterminationofthePigmentContentofSolvent-ReduciblePaintsbyHigh-SpeedCen-trifuging4D2832GuideforDeterminingVolatileandNonvolatileContentofPaintandRelatedCoatings43.SignificanceandUse3.1Thesiliconcontentofsiliconemodifiedalkydshasadirectrelationshiptothecostandperformancecharacteristics,especiallyheatresistanceofcoatingspreparedfromthem.4.SummaryofTestMethod4.1Thepolymersolutionorseparatedcoatingvehicleisdilutedwithmethylisobutylketone,andthesiliconcontentisdeterminedbyatomicabsorptionspectroscopy.5.Apparatus5.1AtomicAbsorptionSpectrophotometer,consistingofanatomizerandasingle-slotburner;gaspressure-regulatingand-meteringdevicesfornitrousoxide(N2O)andacetylene;asiliconhollow-cathodelampwitharegulatedconstantcurrentsupply;amonochromatorandassociatedoptics;aphotosensi-tivedetectorconnectedtoanelectronicamplifier;andaread-outdevice.5.2Centrifuge.5.3Pipets,5,10,15,and20-mLcapacity.5.4VolumetricFlasks,2...
