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).

24 h / 23 °C / 50 % relative humidity

Testing of the burning behavior
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.

Failure criteria
  • Sudden pressure drop
  • Changes in the flame

Insulating materials

This test method comprises edge and surface flame applications to a specimen. The test is carried out with a short flame application time and a long flame application time in each case. The burning time, flammability (dripping of burning specimens), formation of holes, and complete burning of the specimen are documented.