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High Voltage Arc Resistance to Ignition (HVAR) - UL 746 Test Standard Explained

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High Voltage Arc Resistance to Ignition (HVAR) - UL 746

The number of seconds that a material resists ignition when subjected to a high voltage low current arcing source.

Performance Level Categories (PLC) were introduced to avoid excessive implied precision and bias.

Mean Time to Ignition (sec)	PLC
300 and longer	0
120 through 299	1
30 through 119	2
<30	3

Property information for specific grades of resin are available in the Prospector Plastics Database.