Horizontal Burning
The horizontal burning test is used to determine the HB flammability rating of a material.
The flammability rating is calculated for a test specimen as a function of the burning rate and taking account of the material thickness.
Pre-treatment:
48 hours / 23°C / relative humidity
| Flame application: | 20 mm high Tirill burner flame |
| Flame application time: | 30 s |
| If the flame front reaches the first mark within 30 s, flame application is discontinued. |
| Test criteria | Burning rate in V | Flammability rating |
|---|---|---|
| Test specimen thickness 3 - 13 mm | ≤ 40 mm/min | HB |
| Test specimen thickness ‹ 3 mm | ≤ 75 mm/min | HB |
| Flame is extinguished before first mark | = 0 mm/min | HB |