Flammability UL 94 HBF
Horizontal Burning Foamed Material
The horizontal burning test on foamed materials is used to determine the UL 94-HBF, HF-1 and HF-2 flammability ratings taking account of the calculated density.
Vorbehandlung:
2 days / 23 °C / 50 % relative humidity.
7 days / 70 °C / hot air oven
| Flame height | 38 mm |
| Flame application time | 60 s |
| Flammability rating UL 94 HBF | ||
|---|---|---|
| Test criteria (test specimens) | HF-1 | HF-2 |
| Burning time (s) | 4/5 ≤ 2 1/5 ≤ 10 |
4/5 ≤ 2 1/5 ≤ 10 |
| Burning and afterglow times of each individual specimen (s) | ≤ 30 | ≤ 30 |
| Dripping of burning specimens (ignition of cotton batting) |
no | yes |
| Damaged length of each individual specimen (mm) | < 60 | < 60 |
Criteria for HBF ratings
- Burning rate ≤ 40mm over a distance of 100 mm
- Flame or glow is extinguished before 125 mm mark
