Flammability UL 94 V

50 W, 20 mm Vertical

This method is used to determine the UL 94 V-0, V-1 and V-2 flammability ratings.

The test evaluates both the burning and afterglow times and dripping of the burning test specimen.

2 days / 23 °C / 50 % relative humidity
7 days / 70 °C / hot air oven

Flame height 20 mm
Flame application time 2 x 10 s
The second flame application time begins as soon as the first burning time ends


Flammability rating UL 94 V
Test criteria V-0 V-1 V-2
Burning time of each individual test specimen (s)
(after first and second flame applications)
≤10 ≤30 ≤30
Total burning time (s)
(10 flame applications)
≤50 ≤250 ≤250
Burning and afterglow times after second flame application (s) ≤30 ≤60 ≤60
Dripping of burning specimens
(ignition of cotton batting)
no no yes
Combustion up to holding clamp
(specimens completely burned)
no no no