Flammability


MaterialsmaybeclassifiedbasedonburningtestsconductedinaccordancewithANSI/UL94，"TestsforFlammabilityofPlasticMaterialsforPartsinDevicesandAppliances，"ANSI/UL1694，"TestsforFlammabilityofSmallPolymericComponentMaterials，"andANSI/UL723，"TestforSurfaceBurningCharacteristicsofBuildingMaterials."
ANSI/UL94small-scaletestdatadoesnotpertaintobuildingmaterials，furnishingsandrelatedcontents，andisintendedsolelyfordeterminingtheflammabilityofplasticmaterialsusedinthecomponentsandpartsofend-use-productdevicesandappliances，wheretheacceptabilityofthecombinationisdeterminedbyUL.
TESTNAME(perANSI/UL94)


HorizontalBurningTest 
20mmVerticalBurningTestThinMaterialVerticalBurningTestHorizontalBurningFoamedMaterialTest  
500Watt(125mm)VerticalTest
FlameRatingHierarchy—V-0VTM-0—MoreSevere5VA
—V-1VTM-1HF-1↑
↑
↑
—V-2VTM-2HF-25VB
HB——HBFLessSevere
ThermalEndurance


Thematerialscoveredbythisprogramhavebeeninvestigatedwithrespecttothermalenduranceofcertaincriticalproperties.Theinvestigationwasperformedaspartofalong-termthermal-agingprogramorbasedonhistoricalrecordinaccordancewithANSI/UL746B，"PolymericMaterials-LongTermPropertyEvaluations."Thetemperaturebelowwhichaclassofcriticalpropertywillnotbeunacceptablycompromisedthroughchemicalthermaldegradation，overthereasonablelifeofanelectricalproduct(relativetoareferencematerialhavingaconfirmed，acceptablecorrespondingperformance)isdefinedastheRelativeThermalIndex(RTI).MorethanoneRTImaybeappropriateforagivenmaterialdependingonthepropertyrequirementsforagivenapplication.Incertaincases，highertemperaturesarepermittedifsospecifiedbytheend-use-productstandard.
RTIElec—ElectricalRTI，associatedwithcriticalinsulatingproperties.
RTIMechImp—MechanicalImpactRTI，associatedwithcriticalimpactresistance，toughness，elongationandflexibilityproperties.
RTIMechStr—MechanicalStrength(MechanicalwithoutImpact)RTI，associatedwithcriticalmechanicalstrengthandstructuralintegritywhereimpactresistance，resilienceandflexibilitymaynotbeessential.
ResistancetoIgnitionandTrackingProperties


Performancemaybeinvestigatedwithrespecttoelectricaltrackresistance，abilitytoresistignitionfromelectricalsources，andotherelectricalproperties.Inordertoavoidanexcessivelevelofimpliedprecisionandbias，materialperformancesforseveraltestsarerecordedasPerformanceLevelCategories(PLC)，basedonthemeantestresults(ratherthanrecordingtheexactnumericalresults)，asindicatedinthetablefollowingthetestdescription.
Hot-wireIgnition(HWIASTMD3874，IEC60695-2-20)—Performanceisexpressedasthemeannumberofsecondsneededtoignitestandardspecimens(ifthematerialignited).AnHWIPLC0maybeduetoallthetestspecimensmeltingawaywithoutanyignition.
HWIRange 
MeanIgnitionTime(insec)Assigned 
PLC
120andlonger0
60through1191
30through592
15through293
7through144
Lessthan75
High-current-arcIgnition(HAIANSI/UL746A)—Performanceisexpressedasthenumberofarc-ruptureexposures(standardizedastoelectrodetypeandshapeandelectriccircuit)thatarenecessarytoigniteamaterialwhentheyareappliedatastandardrateonthesurfaceofthematerial.
HAIRange 
MeanNumberofArcs 
toCauseIgnitionAssigned 
PLC
120andgreater0
60through1191
30through592
15through293
Lessthan154
High-voltage-arcTrackingRate(HVTRANSI/UL746A)—Denotedastherate，inmm/min，thatatrackingpathcanbeproducedonthesurfaceofthematerialunderstandardizedtestconditions.Anotationismadeifignitiononthematerialtakesplace.Theresultsoftestingthenominal3mmthicknessareconsideredrepresentativeofthematerial‘sperformanceinanythickness.






代理范圍:


(一)水平燃燒測試，94HB，并指導前期打樣送測


(二)垂直燃燒測試，94V-2，94V-1，94V-0，并指導前期打樣送測


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