The testing laboratory for explosiveness carries out the test Determination of ignition temperature of a dust layer according to EN 50281-2-1 method A. Determination of this parameter takes place on a heated surface of a testing device. The heated surface consists of a rounded metal plate which is at least 20 mm thick and forms a working surface of around 200 mm. The dust layer must be created without being excessively pressed. The result of the test is the minimum ignition temperature in a 5-mm dust layer.