IP 491
FLASH / NO FLASH BY CLOSED CUP EQUILIBRIUM METHOD.
This International Standard specifies a method to determine if paints, varnishes, paint binders, solvents, petroleum or related products, when maintained at a selected equilibrium temperature and under the conditions of the test, give off sufficient flammable vapour to cause ignition on application of an external source of flame applied in a standard manner.
The method is suitable for use over the temperature range -30 °C to 110 °C, depending on the use of different apparatus listed in Table 1.