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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