SSPC-Paint-20.-Paint-Specification-No.20.-Zinc-Ric

365SSPC-Paint20November1,1982EditorialChangesAugust1,1991SSPC:TheSocietyforProtectiveCoatingsPAINTSPECIFICATIONNO.20Zinc-RichPrimers(TypeI,Inorganic,andTypeII,Organic)1.Scope1.1Thisspecificationcoversonegroupofhighlypig-mentedzinc-richcoatingsthatareuniquelydefinedbytheircapabilityofgalvanicallyprotectingsteelexposedatdiscontinuitiessuchasnarrowscratchesandholidays.Whilethemajorpigmentcomponentinthiscoatingiszincdust,thevehiclemaybeinorganic(TypeI)ororganic(TypeII).1.2Thisspecificationdoesnotcoveralltypesofzinc-richcoatings.Forexample,itisnotastraightperformancespecification,nordoesitpertaintoextendedzinc-richcoatings,nortoweldablepre-fabricationzinc-richprimers,whichareappliedatlowthicknesses(approximatelyonemil[25micrometers]orless).Furtherinformationregardingtheseandotherzinc-richcoatingscanbefoundinSSPC-PSGuide12.00,GuidetoZinc-RichPaintingSystems,andotherSSPCspecifications.1.3Thisspecificationdefinestheminimumcomposi-tionalandlaboratoryperformancerequirementsforidenti-fyingagroupofzinc-richpaints.Itistobeusedinconjunc-tionwithSSPC-PSGuide12.00,GuidetoZinc-RichPaint-ingSystems;andwithotherSSPCspecificationscoveringsurfacepreparation,applications,thickness,inspection,andsafety.1.4Thisprimer,whenappliedoverproperlypreparedsteelsurfaces,issuitableforuseonpartsorstructuresexposedinEnvironmentalZones1A(interior,normallydry),1B(exterior,normallydry),2A(frequentlywetbyfreshwater),and2C(freshwaterimmersion).TheymaybeusedinEnvironmentalZones2B(frequentlywetbysaltwater),2D(saltwaterimmersion),3A(chemical,acidic),and3C(chemical,alkaline)withpropertopcoating.1.5ThisprimerisintendedforapplicationbysprayandistobeappliedinaccordancewithSSPC-PA1,Shop,Field,andMaintenancePaintingofSteel.2.Description2.1Thezinc-richcoatingsdescribedinthisspecifica-tionconsistofzincdust,anorganicorinorganicvehicle,andselectedadditivesasrequired.2.2PIGMENTATION:2.2.1ThemajorpigmentcomponentinthesecoatingsiszincdustofthetypedescribedinASTMD520,ZincDust(MetallicZincPowder).2.2.2Otherpigmentcomponentsmayincludecuringaids,tintingcolors,suspensionandpotlifecontrolagents,butshouldconstituteonlyaminorpartofthetotalpigmentportionsoasnottodetractfromtheabilityofthesecoatingstoprotectgalvanically.2.3VEHICLETYPES:2.3.1Typel-A,inorganicpost-curingvehicles—watersoluble,includealkalimetalsilicates,phosphates,andmodificationsthereofwhichmustbesubsequentlycuredbyapplicationofheatorasolutionofacuringcompound.2.3.2Typel-B,inorganicself-curingvehicles—waterreducible,includewatersolublealkalimetalsilicates,quarternaryammoniumsilicates,phosphates,andmodifi-cationsthereof.Thesecoatingscurebycrystallizationafterevaporationofwaterfromthecoating.2.3.3Typel-C,inorganicself-curingvehicles—solventreducible,includetitanates,organicsilicates,andpoly-mericmodificationsofthesesilicates.Thesesystemsaredependentuponmoistureintheatmospheretocompletehydrolysis,formingthepolysilicate.2.3.4TypeII,organicvehicles—includephenoxies,catalyzedepoxies,urethanes,chlorinatedrubbers,sty-renes,silicones,vinyls,andothersuitableresinousbind-ers.Theorganicvehiclescoveredbythisspecificationmaybechemicallycuredormaydrybysolventevaporation.Undercertainconditionsheatmaybeusedtofacilitateoracceleratehardening.3.ReferenceStandards3.1ThestandardsreferencedinthisspecificationarelistedinSections3.4through3.7andformapartofthisspecification.3.2Thelatestissue,revision,oramendmentofthereferencedstandardsineffectonthedateofinvitationtobidshallgovernunlessotherwisespecified.366SSPC-Paint20November1,1982EditorialChangesAugust1,19913.3Ifthereisaconflictbetweentherequirementsofanyofthecitedreferencestandardsandthisspecification,therequirementsofthisspecificationshallprevail.3.4SSPCSTANDARDSANDJOINTSTANDARDS:PA1Shop,Field,andMaintenancePaintingofSteelPAGuide3AGuidetoSafetyinPaintAppli-cationPS12.01One-CoatZinc-RichPaintingSystemPSGuide12.00GuidetoZinc-RichCoatingSys-temsSP5/NACENo.1WhiteMetalBlastCleaning3.5AMERICANSOCIETYFORTESTINGANDMA-TERIALS(ASTM)STANDARDS:A36SpecificationforCarbonStructuralSteelB117PracticeforOperatingSaltSpray(Fog)ApparatusD56TestMethodforFlashPointbyTagClosedTesterD185TestMethodsforCoarseParticlesinPig-ments,Pastes,andPaintsD521TestMethodsforChemicalAnalysisofZincDust(MetallicZincPowder)D562TestMethodforConsistencyofPaintsUsingtheStormerViscometerD1200TestMethodforViscositybyFordViscos-ityCupD1308TestMethodforEffectofHouseholdChemicalsonClearandPigmentedOr-ganicFinishesD2369TestMethodforVolatileContentofCoat-ingsD2371TestMethodforPigmentContentofSol-vent-ReduciblePaintsD3359TestMethodsforMeasuringAdhesionbyTapeTestD3925PracticeforSamplingLiquidPaintsandRelatedPigmentedCoatings3.6FEDERALSTANDARDS:PPP-P-1892Paint,Varnish,Lacquer,andRelatedMaterials;Packaging,PackingandMarkingofFED-STD-141Paint,Varnish,LacquerandRelatedMaterials:MethodsofInspection,SamplingandTestingMethod4331SprayingPropertiesMethod4541WorkingPropertiesandAppear-anceofDriedFilm3.7AMERICANNATIONALSTANDARDSINSTITUTE(ANSI)STANDARD:Z129.1HazardousIndustrialChemicals—PrecautionaryLabeling4.Composition4.1Thepaintshallconformt