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.
HVTRRange
(inmm/min)Assigned
PLC
0through100
10.1through25.41
25.5through802
80.1through1503
Greaterthan1504
High-voltage,Low-current-arcResistance(D495ASTMD495)—Expressedasthenumberofsecondsthatamaterialresiststheformationofasurface-conductingpathwhensubjectedtoanintermittentlyoccurringarcofhigh-voltage,low-currentcharacteristics.Theresultsoftestingthenominal3mmthicknessareconsideredrepresentativeofthematerial‘sperformanceinanythickness.
D495Range 
MeanTimeofArcResistance 
(insec)Assigned 
PLC
420andlonger0
360through4191
300through3592
240through2993
180through2394
120through1795
60through1196
Lessthan607
ComparativeTrackingIndex(CTIASTMD3638)—Expressedasthatvoltagewhichcausestrackingafter50dropsof0.1%ammoniumchloridesolutionhavefallenonthematerial.Theresultsoftestingthenominal3mmthicknessareconsideredrepresentativeofthematerial‘sperformanceinanythickness.
CTIRange 
TrackingIndex 
(involts) 
Assigned 
PLC
600andgreater0
400through5991
250through3992
175through2493
100through1744
Lessthan1005
Theabovecharacteristicsanddielectricstrength,volumeresistivityandotherelectricalandmechanicalpropertiesmaybedeterminedbymeansoftheapplicableASTMand/orULspecificationinANSI/UL746A,"PolymericMaterials-ShortTermPropertyEvaluations."
Inadditiontominimumelectricalandignitiontestlevels,materialsthatareusedinapplicationsinvolvingsupportorcontactwithcurrent-carryingpartsarealsorequiredtodisplayaminimumstability(heatdistortion,moistureresistance,dimensionalstabilityandmoldstress)performancelevel,asdescribedinANSI/UL746C.
代理范围:
(一)水平燃烧测试,94HB,并指导前期打样送测
(二)垂直燃烧测试,94V-2,94V-1,94V-0,并指导前期打样送测
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