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BS47671997建筑材料和構(gòu)件的燃燒試驗制品表面火勢蔓延的試驗和分級方法|BS476BRITISHSTANDARD|PART71997|FIRETESTSONBUILDING|MATERIALSANDSTRUCTURES|PART7METHODOFTESTTODETERMINETHE|CLASSIFICATIONOFTHESURFACESPREADOF|FLAMEOFPRODUCTS|ICS1322050|NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAW|LICENSEDCOPYAUBUSER,NA,WEDMAR28033458GMT00002007,UNCONTROLLEDCOPY,CBSIBS476PART71997COMMITTEESRESPONSIBLEFORTHISBRITISHSTANDARDTHEPREPARATIONOFTHISBRITISHSTANDARDWASENTRUSTEDBYTECHNICALCOMMITTEEFSH/21,REACTIONTOFIRETESTS,UPONWHICHTHEFOLLOWINGBODIESWEREREPRESENTEDASSOCIATIONOFBUILDINGCOMPONENTMANUFACTURERSASSOCIATIONOFROOFLIGHTMANUFACTURERSAUTOCLAVEDAERATEDCONCRETEPRODUCTSASSOCIATIONBRITISHCARPETMANUFACTURERSASSOCIATIONLTDBRITISHIRONANDSTEELPRODUCERSASSOCIATIONBRITISHPLASTICSFEDERATIONBRITISHRAILWAYSBOARDBRITISHRESILIENTFLOORINGMANUFACTURERSASSOCIATIONBRITISHRIGIDURETHANEFOAMMANUFACTURERSASSOCIATIONBRITISHWOODPRESERVINGANDDAMPPROOFINGASSOCIATIONCHEMICALINDUSTRIESASSOCIATIONCHIEFANDASSISTANTCHIEFFIREOFFICERSASSOCIATIONDEPARTMENTOFHEALTHDEPARTMENTOFTHEENVIRONMENTBUILDINGRESEARCHESTABLISHMENTDEPARTMENTOFTHEENVIRONMENTPROPERTYANDBUILDINGSDIRECTORATEDEPARTMENTOFTHEENVIRONMENTFORNORTHERNIRELANDEURISOLUKMINERALWOOLASSOCIATIONEUROPEANPHENOLICFOAMASSOCIATIONFIBRECEMENTMANUFACTURERSASSOCIATIONLIMITEDFLATGLASSMANUFACTURERSASSOCIATIONGAMBICABEAMALTDGYPSUMPRODUCTSDEVELOPMENTASSOCIATIONHOMEOFFICEINSTITUTEOFFIRESAFETYINSTITUTIONOFFIREENGINEERSLONDONFIREANDCIVILDEFENCEAUTHORITYLOSSPREVENTIONCOUNCILNATIONALCOUNCILOFBUILDINGMATERIALPRODUCERSNATIONALGRPCONSTRUCTIONANDENGINEERINGFEDERATIONPOLYETHYLENEFOAMINSULATIONASSOCIATIONQUEENMARYANDWESTFIELDCOLLEGERAPRATECHNOLOGYLTDSPECIALISTCEILINGSANDINTERIORSASSOCIATIONLTDTHERMALINSULATIONMANUFACTURERSANDSUPPLIERSASSOCIATIONTIMSATIMBERRESEARCHANDDEVELOPMENTASSOCIATIONWARRINGTONFIRERESEARCHCENTREWOODPANELINDUSTRIESFEDERATIONWOODWOOLSLABMANUFACTURERSASSOCIATIONCOOPTEDMEMBERSTHISBRITISHSTANDARD,HAVINGBEENPREPAREDUNDERTHETHEFOLLOWINGBODIESWEREALSOREPRESENTEDINTHEDRAFTINGOFTHESTANDARD,THROUGHDIRECTIONOFTHECONSUMERSUBCOMMITTEESANDPANELSPRODUCTSANDSERVICESSECTORBOARD,WASPUBLISHEDUNDERTHEAUTHORITYOFTHESTANDARDSBOARDBRITISHTEXTILETECHNOLOGYGROUPANDCOMESINTOEFFECTONUNIVERSITYOFEDINBURGH15JANUARY1997BSI1997AMENDMENTSISSUEDSINCEPUBLICATIONFIRSTPUBLISHEDASBS476AMDNODATETEXTAFFECTEDDECEMBER1932SECONDEDITIONJULY1953FIRSTPUBLISHEDASBS476PART7FEBRUARY1971SECONDEDITIONJUNE1987THIRDEDITIONJANUARY1997THEFOLLOWINGBSIREFERENCESRELATETOTHEWORKONTHISSTANDARDCOMMITTEEREFERENCEFSH/21DRAFTFORCOMMENT94/307806DCISBN0580262987LICENSEDCOPYAUBUSER,NA,WEDMAR28033458GMT00002007,UNCONTROLLEDCOPY,CBSIBS476PART71997CONTENTSPAGEFOREWORDIIMETHOD1SCOPE12NORMATIVEREFERENCES13DEFINITIONS14SUITABILITYOFAPRODUCTFORTESTING25TESTSPECIMENS26APPARATUS37ANCILLARYEQUIPMENT118CALIBRATION129TESTPROCEDURE1310RECORDINGOFRESULTS1411CLASSIFICATIONOFRESULTS1412REPORT15ANNEXESAINFORMATIVEGUIDANCEFOROPERATORS16BINFORMATIVEEFFECTOFTHERMALCHARACTERISTICSONTHEPERFORMANCEOFASSEMBLIES16CINFORMATIVEVALIDATIONOFTESTMETHOD17TABLES1IRRADIANCEALONGHORIZONTALREFERENCELINEONTHECALIBRATIONBOARD132CLASSIFICATIONOFSPREADOFFLAME15FIGURES1GENERALARRANGEMENTOFATYPICALAPPARATUS52TYPICALDESIGNOFSPECIMENHOLDER63POSITIONOFSPECIMENHOLDERINRELATIONTORADIATIONPANEL84POSITIONOFPILOTBURNERINRELATIONTOSURFACEOFSPECIMEN95TYPICALDIAGRAMMATICARRANGEMENTOFGASANDAIRSUPPLY106CALIBRATIONBOARD127REFERENCELINESTOASSISTSURFACESPREADOFFLAMECLASSIFICATION14LISTOFREFERENCESINSIDEBACKCOVERBSI1997ILICENSEDCOPYAUBUSER,NA,WEDMAR28033458GMT00002007,UNCONTROLLEDCOPY,CBSIBS476PART71997FOREWORDTHISPARTOFBS476HASBEENPREPAREDBYTECHNICALCOMMITTEEFSH/21ITSUPERSEDESBS476PART71987,WHICHISWITHDRAWN,BUTBOTHTHE1971AND1987EDITIONSWILLSTILLBEMADEAVAILABLEONREQUESTSINCETHEYAREREFERREDTOINBUILDINGREGULATIONSANDOTHERLEGISLATIVEDOCUMENTSNOTEUPONPUBLICATIONOFBS476PART71996,BSICUSTOMERSERVICESDEPARTMENTWILLRESPONDTOPURCHASEORDERSFORBS476PART7BYSUPPLYINGTHE1996EDITIONCOPIESOFTHE1987OR1971EDITIONSMAYBEOBTAINEDBYQUOTINGTHENUMBERBS476/7/87ORBS476/7/71RESPECTIVELYTHISREVISIONHASBEENPREPAREDWITHTHEAIMOFIMPROVINGTHEREPEATABILITYANDREPRODUCIBILITYOFTHETESTRESULTSBYCLARIFYINGPROCEDURESANDBYGIVINGADDITIONALGUIDANCETOTESTOPERATORSTHECHANGESINCORPORATEDINTOTHISREVISIONARENOTEXPECTEDTOCAUSECHANGESINMATERIALCLASSIFICATIONSINTHISMETHOD,SPECIMENSOFTHEPRODUCTMATERIAL,COMPOSITEORASSEMBLYARESUBJECTEDTOASPECIFIEDHEATINGANDIGNITIONREGIMETHETESTTAKESACCOUNTOFTHECOMBINEDEFFECTOFFACTORSSUCHASIGNITIONCHARACTERISTICSANDTHEEXTENTTOWHICHTHEFLAMESPREADSOVERTHESURFACEOFTHEPRODUCTUNDEROPPOSEDFLOWCONDITIONSTHEINFLUENCEOFANYUNDERLYINGMATERIALSONTHESEFACTORS,INRELATIONTOTHEIRABILITYTOINFLUENCETHERATEOFFIREGROWTH,ISALSOTAKENINTOACCOUNTTHETESTRESULTISAFUNCTIONOFTHEDISTANCEANDRATEOF,THELATERALSPREADOFFLAMEANDTHISISCLASSIFIEDACCORDINGTOPERFORMANCEASCLASSES1TO4ASERIESOFNEWREACTIONTOFIRETESTSISUNDERDEVELOPMENTINISO/TC92/SC1,REACTIONTOFIRETESTSTHEUKISPARTICIPATINGINTHISWORK,WHICHWILLDEFINESMALLSCALE,INTERMEDIATESCALEANDLARGESCALETESTSFORIGNITABILITY,HEATRELEASERATEANDFLAMEPROPAGATIONISO5658WILLCOVERSPREADOFFLAMEPART1GIVINGGUIDANCEONSPREADOFFLAMEANDPART2MEASURINGOPPOSEDFLOWLATERALSPREADOFFLAMEALONGTHESURFACEOFASPECIMENOFAPRODUCTINTHEVERTICALPOSITIONPART2WILLBEIMPLEMENTEDASBS476PART14THERADIANTPANELUSEDINISO56582ISSMALLERTHANTHATINTHISPARTOFBS476BUT,BYINCLININGTHEPANELTOTHESPECIMENAT15,THEHEATFLUXATTHEHOTENDOF2THESPECIMENISINCREASEDTO50KW/MPART3OFISO5658,WHICHISALSOUNDERDEVELOPMENT,REFERSTOTHISPROCEDUREASTHELIFTLATERALIGNITIONANDFLAMESPREADTESTANDITISEXPECTEDTOPROVIDEMOREFUNDAMENTALDATAFORMATHEMATICALMODELLINGTHANISO56582ORTHISPARTOFBS476ATTENTIONISDRAWNTOTHEHEALTHANDSAFETYATWORKETCACT1974,ANDTHENEEDTOENSURETHATTHEMETHODOFTESTSPECIFIEDINTHISSTANDARDISCARRIEDOUTUNDERSUITABLEENVIRONMENTALCONDITIONSTOPROVIDEADEQUATEPROTECTIONTOPERSONNELAGAINSTTHERISKOFFIREANDINHALATIONOFSMOKEAND/ORTOXICPRODUCTSOFCOMBUSTIONCOMPLIANCEWITHABRITISHSTANDARDDOESNOTOFITSELFCONFERIMMUNITYFROMLEGALOBLIGATIONSIIBSI1997LICENSEDCOPYAUBUSER,NA,WEDMAR28033458GMT00002007,UNCONTROLLEDCOPY,CBSIBS476PART71997METHOD34IRRADIANCEATAPOINTONASURFACE1SCOPETOTALTHERMALRADIANTFLUXINCIDENTONANTHISPARTOFBS476SPECIFIESAMETHODOFTESTFORINFINITESIMALELEMENTOFTHESURFACECONTAININGTHEMEASURINGTHELATERALSPREADOFFLAMEALONGTHEPOINT,DIVIDEDBYTHEAREAOFTHATELEMENTSURFACEOFASPECIMENOFAPRODUCTORIENTATEDINTHEVERTICALPOSITIONUNDEROPPOSEDFLOWCONDITIONS,AND35ESSENTIALLYFLATSURFACEACLASSIFICATIONSYSTEMBASEDONTHERATEANDEXTENTSURFACEFROMWHICHSPECIMENSCANBEOBTAINEDTHATOFTHESPREADOFFLAMEITPROVIDESDATASUITABLEFORHAVEANIRREGULARITYFROMAFLATPLANEWHICHISLESSCOMPARINGTHEENDUSEPERFORMANCESOFESSENTIALLYTHAN3MMFLATMATERIALS,COMPOSITESORASSEMBLIES,WHICHAREUSEDPRIMARILYASTHEEXPOSEDSURFACESOFWALLSOR36FLASHINGCEILINGSEXISTENCEOFAFLAMEONOROVERTHESURFACEOFTHEANNEXAGIVESGUIDANCETOOPERATORSCARRYINGOUTSPECIMENFORPERIODSOFLESSTHAN1STHISMETHODOFTESTANNEXBDISCUSSESTHEEFFECTOF37TRANSITORYFLAMINGTHERMALCHARACTERISTICSONTHEPERFORMANCEOFEXISTENCEOFFLAMEONOROVERTHESURFACEOFTHEASSEMBLIESANDGIVESADVICEONTHECONSTRUCTIONANDSPECIMENFORPERIODSOFBETWEEN1SAND3SPREPARATIONOFTESTSPECIMENSANNEXCGIVESINFORMATIONONTHEVALIDATIONOFTHISMETHOD38SUSTAINEDFLAMINGNOTETHETESTRESULTSRELATEONLYTOTHEBEHAVIOUROFTHETESTEXISTENCEOFFLAMEONOROVERTHESURFACEOFTHESPECIMENSOFTHEPRODUCTUNDERTHEPARTICULARCONDITIONSOFTESTSPECIMENFORPERIODSOFOVER3STHEYARENOTINTENDEDTOBETHESOLECRITERIONFORASSESSINGTHEPOTENTIALFIREHAZARDOFTHEPRODUCTINUSE39RADIANTEXITANCEATAPOINTONASURFACEQUOTIENTOFTHERADIANTFLUXLEAVINGANELEMENTOFTHE2NORMATIVEREFERENCESSURFACECONTAININGTHEPOINT,DIVIDEDBYTHEAREAOFTHISPARTOFBS476INCORPORATES,BYDATEDORTHATELEMENTUNDATEDREFERENCE,PROVISIONSFROMOTHER310MATERIALPUBLICATIONSTHESENORMATIVEREFERENCESAREMADESINGLESUBSTANCEORUNIFORMLYDISPERSEDMIXTURE,EGATTHEAPPROPRIATEPLACESINTHETEXTANDTHECITEDMETAL,STONE,TIMBER,CONCRETE,MINERALFIBRE,PUBLICATIONSARELISTEDONTHEINSIDEBACKCOVERFORPOLYMERSDATEDREFERENCES,ONLYTHEEDITIONCITEDAPPLIESANYSUBSEQUENTAMENDMENTSTOORREVISIONSOFTHECITED311PRODUCTPUBLICATIONAPPLYTOTHISPARTOFBS476ONLYWHENMATERIAL,COMPOSITEORASSEMBLYABOUTWHICHINCORPORATEDINTHEREFERENCEBYAMENDMENTORINFORMATIONISREQUIREDREVISIONFORUNDATEDREFERENCES,THELATESTEDITIONOFTHECITEDPUBLICATIONAPPLIES,TOGETHERWITHANY312SUBSTRATEAMENDMENTSMATERIALUSED,ORREPRESENTATIVEOFTHATUSED,IMMEDIATELYBENEATHASURFACEINENDUSEEGFIBRE3DEFINITIONSCEMENTBOARDBENEATHAFLOORCOVERINGFORTHEPURPOSESOFTHISBRITISHSTANDARD,THE313ASSEMBLYDEFINITIONSGIVENINBS4422PART11987,FABRICATIONOFMATERIALSAND/ORCOMPOSITESTHATCANPART21990,ANDPART51989,ANDBS476CONTAINAIRGAPSPART101983APPLY,TOGETHERWITHTHEFOLLOWING314COMPOSITE31EXPOSEDSURFACESCOMBINATIONOFMATERIALSWHICHAREGENERALLYSURFACESOFTHEPRODUCTSUBJECTEDTOTHEHEATINGRECOGNIZEDINBUILDINGCONSTRUCTIONSASDISCRETECONDITIONSOFTHETESTENTITIES,EGCOATEDORLAMINATEDMATERIALS32SPREADOFFLAME315THINFILMPROPAGATIONOFAFLAMEFRONTOVERTHESURFACEOFADISCRETESURFACELAYERORCOATINGHAVINGATHICKNESSPRODUCTUNDERTHEINFLUENCEOFIMPOSEDIRRADIANCELESSTHANOREQUALTO50MM33FLAMEFRONTFURTHESTEXTENTOFTRAVELOFACOHERENTFLAMEALONGTHEREFERENCELINEMARKEDONTHETESTSPECIMENBSI19971LICENSEDCOPYAUBUSER,NA,WEDMAR28033458GMT00002007,UNCONTROLLEDCOPY,CBSIBS476PART719974SUITABILITYOFAPRODUCTFORTESTING5TESTSPECIMENS41SURFACECHARACTERISTICS51NUMBEROFSPECIMENSAMINIMUMOFSIXANDAIMUMOFNINETEST411APRODUCTSHALLHAVEONEOFTHEFOLLOWINGSPECIMENSSHALLBEPROVIDED,ANDTHEYSHALLBECHARACTERISTICSTOBESUITABLEFOREVALUATIONBYTHISREPRESENTATIVEOFTHEEXPOSEDSURFACEOFTHEPRODUCTMETHODAANESSENTIALLYFLATEXPOSEDSURFACE52THEEXPOSEDSURFACEBASURFACEIRREGULARITYTHATISEVENLYDISTRIBUTEDTHEPRODUCTSHALLBETESTEDONTHATFACEWHICHISOVERTHEEXPOSEDSURFACESEEA1,PROVIDEDTHATNORMALLYEXPOSEDINPRACTICE,TAKINGACCOUNTOFTHEBOTHOFTHEFOLLOWINGAPPLYFOLLOWING1ATLEAST50OFTHESURFACEOFAREPRESENTATIVEAIFITISPOSSIBLEFOREITHERORBOTHOFTHEFACESTOSQUAREAREAOF270MM3270MMLIESWITHINABEEXPOSEDINUSETHEN,IFTHEFACESAREDIFFERENTDEPTHOF6MMFROMAPLANETAKENACROSSTHEORIFTHECOREOFTHOSEFACESISASYMMETRICAL,BOTHHIGHESTPOINTSONTHEEXPOSEDSURFACEANDFACESSHALLBETESTED2ANYCRACKS,FISSURESORHOLESDONOTBIFTHEFACEOFTHEPRODUCTCONTAINSASURFACEEXCEED65MMINWIDTH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