Minimum Explosive Concentration (MEC)

Dust and Powder Flammability Testing

Standards

BS EN 14034 part 3 / ASTM E1515

Minimum Explosive Concentration Test

The minimum explosive concentration test is conducted to determine the minimum quantity of powder dispersed in air, as a dust cloud that will ignite. Working through a range of decreasing powder concentrations, the powder is dispersed into a 20L explosion vessel (sphere) using, dry compressed air. These suspended dust clouds are then exposed to a large 2 kJ chemical ignition source and any ignition and following explosion is monitored, measured and recorded. The powder concentration is reduced until ignition is not possible and the MEC established.

Sigma-HSE Group

Benefits

Data generated by the minimum explosive concentration test is predominantly used to either ensure that levels of airborne dust are kept below that to form a flammable atmosphere or to confirm a material is appropriate for processes with an established LEV or set dust extraction rate.