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.
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|