Burning behavior
UL offers different standards and test methods for determining burning behavior (flammability) specifically for the automotive sector.
These results are relevant both in the Interior of the motor vehicle as well as for components in the engine compartment (E.g. fuel lines).
Pre-treatment:
24 h / 23 °C / 50 % relative humidity
Testing of the burning behavior
Interior fittings
The test method determines the burning time, the burning path, and possibly the burning rate. Different flammability ratings (fire classes) are assigned depending on the standard.
Fuel lines
The hose is arranged horizontally and pressurized with 4 bar. A defined flame is positioned underneath the hose. The time until the test specimen fails is determined.
- Sudden pressure drop
- Changes in the flame
Insulating materials
This test method comprises edge and surface flame applications to a specimen measuring at least 230 x 200 mm. The test is carried out with a short flame application time of 15 s and a long flame application time of 10 min in each case. The burning time, flammability (dripping of burning specimens), formation of holes, and complete burning of the specimen are documented.
