BS 476-7-1997建筑材料和构件的燃烧试验 制品表面火势蔓延的试验和分级方法

|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||BRITISHSTANDARDBS476:Part7:1997ICS13.220.50NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWFiretestsonbuildingmaterialsandstructuresPart7.MethodoftesttodeterminetheclassificationofthesurfacespreadofflameofproductsLicensedCopy:AUBUser,na,WedMar2803:34:58GMT+00:002007,UncontrolledCopy,(c)BSIThisBritishStandard,havingbeenpreparedunderthedirectionoftheConsumerProductsandServicesSectorBoard,waspublishedundertheauthorityoftheStandardsBoardandcomesintoeffecton15January1997©BSI1997FirstpublishedasBS476December1932SecondeditionJuly1953FirstpublishedasBS476:Part7February1971SecondeditionJune1987ThirdeditionJanuary1997ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceFSH/21Draftforcomment94/307806DCISBN0580262987BS476:Part7:1997AmendmentsissuedsincepublicationAmd.No.DateTextaffectedCommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbyTechnicalCommitteeFSH/21,Reactiontofiretests,uponwhichthefollowingbodieswererepresented:AssociationofBuildingComponentManufacturersAssociationofRoofLightManufacturersAutoclavedAeratedConcreteProductsAssociationBritishCarpetManufacturersAssociationLtd.BritishIronandSteelProducersAssociationBritishPlasticsFederationBritishRailwaysBoardBritishResilientFlooringManufacturersAssociationBritishRigidUrethaneFoamManufacturers'AssociationBritishWoodPreservingandDamp-proofingAssociationChemicalIndustriesAssociationChiefandAssistantChiefFireOfficersAssociationDepartmentofHealthDepartmentoftheEnvironment(BuildingResearchEstablishment)DepartmentoftheEnvironment(PropertyandBuildingsDirectorate)DepartmentoftheEnvironmentforNorthernIrelandEurisol(UKMineralWoolAssociation)EuropeanPhenolicFoamAssociationFibreCementManufacturersAssociationLimitedFlatGlassManufacturers'AssociationGAMBICA(BEAMALtd.)GypsumProductsDevelopmentAssociationHomeOfficeInstituteofFireSafetyInstitutionofFireEngineersLondonFireandCivilDefenceAuthorityLossPreventionCouncilNationalCouncilofBuildingMaterialProducersNationalGRPConstructionandEngineeringFederationPolyethyleneFoamInsulationAssociationQueenMaryandWestfieldCollegeRAPRATechnologyLtd.SpecialistCeilingsandInteriorsAssociationLtd.ThermalInsulationManufacturersandSuppliersAssociation(TIMSA)TimberResearchandDevelopmentAssociationWarringtonFireResearchCentreWoodPanelIndustriesFederationWoodWoolSlabManufacturersAssociationCo-optedmembersThefollowingbodieswerealsorepresentedinthedraftingofthestandard,throughsubcommitteesandpanels:BritishTextileTechnologyGroupUniversityofEdinburghLicensedCopy:AUBUser,na,WedMar2803:34:58GMT+00:002007,UncontrolledCopy,(c)BSIBS476:Part7:1997©BSI1997iContentsPageForewordiiMethod1Scope12Normativereferences13Definitions14Suitabilityofaproductfortesting25Testspecimens26Apparatus37Ancillaryequipment118Calibration129Testprocedure1310Recordingofresults1411Classificationofresults1412Report15AnnexesA(informative)Guidanceforoperators16B(informative)Effectofthermalcharacteristicsontheperformanceofassemblies16C(informative)Validationoftestmethod17Tables1Irradiancealonghorizontalreferencelineonthecalibrationboard132Classificationofspreadofflame15Figures1Generalarrangementofatypicalapparatus52Typicaldesignofspecimenholder63Positionofspecimenholderinrelationtoradiationpanel84Positionofpilotburnerinrelationtosurfaceofspecimen95Typicaldiagrammaticarrangementofgasandairsupply106Calibrationboard127Referencelinestoassistsurfacespreadofflameclassification14ListofreferencesInsidebackcoverLicensedCopy:AUBUser,na,WedMar2803:34:58GMT+00:002007,UncontrolledCopy,(c)BSIii©BSI1997BS476:Part7:1997ForewordThisPartofBS476hasbeenpreparedbyTechnicalCommitteeFSH/21.ItsupersedesBS476:Part7:1987,whichiswithdrawn,butboththe1971and1987editionswillstillbemadeavailableonrequestsincetheyarereferredtoinbuildingregulationsandotherlegislativedocuments.NOTE.UponpublicationofBS476:Part7:1996,BSICustomerServicesDepartmentwillrespondtopurchaseordersforBS476:Part7bysupplyingthe1996edition.Copiesofthe1987or1971editionsmaybeobtainedbyquotingthenumber`BS476/7/87'or`BS476/7/71'respectively.Thisrevisionhasbeenpreparedwiththeaimofimprovingtherepeatabilityandreproducibilityofthetestresultsbyclarifyingproceduresandbygivingadditionalguidancetotestoperators.Thechangesincorporatedintothisrevisionarenotexpectedtocausechangesinmaterialclassifications.Inthismethod,specimensoftheproduct(material,compositeorassembly)aresubjectedtoaspecifiedheatingandignitionregime.Thetesttakesaccountofthecombinedeffectoffactorssuchasignitioncharacteristicsandtheextenttowhichtheflamespreadsoverthesurfaceoftheproductunderopposedflowconditions.Theinfluenceofanyunderlyingmaterialsonthesefactors,inrelationtotheirabilitytoinfluencetherateoffiregrowth,isalsotakenintoaccount.Thetestresultisafunctionofthedistanceandrateof,thelateralspreadofflame;andthisisclassifiedaccordingtoperformanceasclasses1to4.Aseriesofnewreactiontofiretestsisunderdevelopmenti