UL 94 Test Method
UL94
Tests for Flammability of Plastic Materials for Parts in Devices and Application
UL94 Test method
・20mm Vertical Burning Test（IEC60695-11-10 B method, ASTM D3801）
⇒to determine V-0, V-1, V-2 flammability rating or Not.
Specimen（125±5㎜ × 13±0.5㎜ × thickness t ㎜）is mounted vertically on a clamp and apply to a flame for 10 seconds twice with a 20 mm flame, and its combustion behavior is judged.
| Criteria | Flammability rating |
|---|
| V-0 | V-1 | V-2 |
|---|
| Total flaming combustion time for each specimen | 10 sec. or less | 30sec. or less | 30sec. or less |
| Total flaming combustion time for all 5 specimens | 50 sec. or less | 250 sec. or less | 250 sec. or less |
| Total flaming combustion time for each specimen + glowing combustion time | 30 sec. or less | 60 sec. or less | 60 sec. or less |
| Whether or not specimen burns up to holding clamp | NO | NO | NO |
| Whether or not flaming drips ignite cotton placed below specimen. | NO | NO | YES |
| Image of combustion |  | |  |
※Glowing combustion time：Time during which the flame burns red without producing a flame (residual dust).
・Horizontal Burning Test (IEC60695-11-10 A method, ASTM D635)
⇒to determine HB flammability rating
Specimen（125±5㎜ × 13±0.5㎜ × thickness t ㎜）is held horizontally, and apply to a flame for 30 seconds with 20mm flame, and its combustion speed of 75mm between the marked lines is judged.
| Criteria | Combustion speed |
|---|
| Specimen thickness over 3㎜ | 40㎜/min or less |
| Specimen thickness below 3㎜ | 75㎜/min or less |
※If the thickness of 3 mm or more is passed, HB is automatically certified for thicknesses from 3.0 mm to 1.6 mm.
