Conducting fire tests simulating the lateral spread of flames along specimens exposed to the heat of external fire. Construction products, vehicle parts (ships,trains, motor vehicles) as well as wall coverings and claddings are suitable for testing.

A vertically oriented, conditioned specimen is exposed to a gas powered radiant heater. This is aligned
at an angle of 15 ° parallel to the specimen, so that the heat radiation hits the sample with a different
intensity over the surface. Where the largest heat input is, the gases dissolving from the specimen
surface are ignited by means of a pilot burner. It is determined how fast and how far the flame spreads
sideways over the specimen, and when it goes out.