BS-6497-1984

BRITISHSTANDARDBS6497:1984IncorporatingAmendmentNo.1SpecificationforPowderorganiccoatingsforapplicationandstovingtohot-dipgalvanizedhot-rolledsteelsectionsandpreformedsteelsheetforwindowsandassociatedexternalarchitecturalpurposes,andforthefinishongalvanizedsteelsectionsandpreformedsheetcoatedwithpowderorganiccoatingsUDC667.633.2–492.2+667.653:667.648.88:669.14–41/–42:669.586:721.011.6Licensedcopy:TheUniversityofHongKong,TheUniversityofHongKong,Versioncorrectasof26/12/201109:07,(c)BSIBS6497:1984ThisBritishStandard,havingbeenpreparedunderthedirectionofthePigments,PaintsandVarnishesStandardsCommittee,waspublishedundertheauthorityoftheBoardofBSIandcomesintoeffecton31August1984©BSI07-1999ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferencePVC/25Draftforcomment82/52958DCISBN0580138518CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbythePigments,PaintsandVarnishesStandardsCommittee(PVC/-)toTechnicalCommitteePVC/25uponwhichthefollowingbodieswererepresented:AluminiumCoatingsAssociationAluminiumFederationAluminiumWindowAssociationBritishInstituteofInteriorDesignDepartmentoftheEnvironment(BuildingResearchEstablishment)GreaterLondonCouncilHEVACAssociationHomeImprovementPowderCoatingsAssociationOilandColourChemists’AssociationPaintmakersAssociationofGreatBritainLtd.RoyalInstituteofBritishArchitectsSteelWindowAssociationAmendmentsissuedsincepublicationAmd.No.DateofissueComments7183July1992IndicatedbyasidelineinthemarginLicensedcopy:TheUniversityofHongKong,TheUniversityofHongKong,Versioncorrectasof26/12/201109:07,(c)BSIBS6497:1984©BSI07-1999iContentsPageCommitteesresponsibleInsidefrontcoverForewordiiSection1.General1Scope12Definitions1Section2.Performanceandotherrequirementsforpowderorganiccoatings3Samplingofpowderorganiccoatings14Performancerequirementsforpowderorganiccoatings15Manufacturer’scertificate36Identificationofpowderorganiccoatings3Section3.Performanceandotherrequirementsforthefinishonhot-dipgalvanizedhot-rolledsteelsectionsandhot-dipgalvanizedpreformedsheetcoatedwithpowderorganiccoatings7Coating38Pre-treatmentofgalvanizedhot-rolledsteelsectionsorpreformedsheet49Samplingofcoatedpanelsandsections410Performancerequirementsforthefinishoncoatedgalvanizedsteelsectionsandpreformedsheet411Applicator’scertificate512Identification,careandmaintenance5Section4.Methodsoftestforpowderorganiccoatingsappliedtoandfinishesonhot-dipgalvanizedsteeltestpanels,sectionsorpreformedsheet13Preparationofcoatedtestpanels614Resistancetomortar615Resistancetoaceticacid/saltspray616Permeabilityofcoatingandqualityofpre-treatmentofthemetalsurface7AppendixAThecareofthefinishoncoatedgalvanizedsteelcomponentsforarchitecturalpurposes8AppendixBThemaintenanceofthefinishoncoatedgalvanizedsteelcomponentsinstalledexternally8Publicationsreferredto10Licensedcopy:TheUniversityofHongKong,TheUniversityofHongKong,Versioncorrectasof26/12/201109:07,(c)BSIBS6497:1984ii©BSI07-1999ForewordThisBritishStandardhasbeenpreparedunderthedirectionofthePigments,PaintsandVarnishesStandardsCommitteeattherequestoftheSteelWindowAssociation.Duetotheincreaseintheuseoffactory-appliedorganiccoatingstohot-dipgalvanizedhot-rolledsectionsforwindowsandassociatedexternalarchitecturalpurposes,theSteelWindowAssociationwasconcernedthatnostandardwasavailabletoensurethatsatisfactoryfinisheswereproduced,particularlybecausethiscouldresultinunsatisfactorywindows,etc.,beingsuppliedtoarchitects,buildersandhousingauthorities.Thisstandard,therefore,dealswithpowdercoatingsandtheapplicationofthosecoatingstohot-dipgalvanizedsteelsectionsandpreformedsteelsheet(complyingwithBS729andBS2989,respectively)foruseinwindowsandforassociatedexternalarchitecturalpurposes.(BS6496dealswithpowderorganiccoatingsforandfinishesonaluminiumalloycomponents.)Thisstandardrelatestotwodifferentinterfaces(betweencoatingmanufacturerandcoatingapplicatorandbetweenapplicatorand,forexample,architect)andhasthereforebeendividedintosectionsinsuchawaythatcompliancecanbeclaimedwiththeappropriatesection.Inordertoassistinidentifyingthesetwointerfaces,theterm“coating”hasbeenusedconsistentlyinsection2todescribethepowderorganiccoatingwhenappliedtothetestpanels,andtheterm“finish”hasbeenusedinsection3whenreferringtothepowderorganiccoatingasappliedbytheapplicator.Section2.ofthisstandardgivestherequirementsfortheorganiccoatingstobeappliedtogalvanizedsteelsectionsandpreformedsheetandthetestsdescribedthereinareintendedtobecarriedoutbythecoatingmanufacturer.Section3.givestherequirementsforthefinishonsectionsandpreformedsheetofgalvanizedsteelandthetestsdescribedthereinareintendedtobecarriedoutbythecoatingapplicator.Somecoatingscontainingmetallicpigmentsandcertaincoatingswithglosslevelsbelow50unitsmaynotcomplywithalltherequirementsofsection2ofthisstandard.Itisstressedthatpreparationandpre-treatmentofthemetalsurfaceareveryimportantinproducingsatisfactoryfinishesonhot-dipgalvanizedsteeland,therefore,toensureoptimumadhesion,apreliminarychemicalconversionofthegalvanizedsteelsurfacehasbeenma