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Foam aerosol: Flammability test (UN Class 2)

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Foam aerosol: Flammability test (UN Class 2)

This test is used to classify foam aerosols as non-flammable, flammable or extremely flammable. For foam aerosols with a spraying distance < 15 cm, the classification is based on flame height and burning time in the foam flammability test.

This test is applied to aerosols with a spray distance < 15 cm and which release a foam, mousse, gel or paste. The aerosol product is sprayed onto a watch glass (approx. 5 g) and an ignition source (candle, wax paper, match or lighter) is positioned on the glass. The foam, mousse, gel or paste is observed to determine if it ignites or there is sustained combustion. Ignition is defined as a stable flame with a burning time of ≥ 2 s and a flame height of ≥ 4 cm.
The classification is made as follows:

  • The aerosol is classified as extremely flammable if the flame height is ≥ 20 cm and the burning time is ≥ 2 s.
  • The aerosol is classified as extremely flammable if the flame height is ≥ 4 cm and the burning time is ≥ 7 s.
  • The aerosol is classified as flammable if the flame height is ≥ 4 cm but < 20 cm and the burning time ≥ 2 s.
  • Otherwise, the aerosol is classified as non-flammable.
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