Our unique hazard classification test offers a qualitative assessment of whether or not a suspended dust cloud is capable of initiating and sustaining an explosion in the presence of four different ignition sources; 10 KV electric spark, hot coil ignition, high temperature (800^oC) and low energy chemical igniters. 

Explosion testing for hazard classification is made on a visual observation of flame propagation in the first three tests and on explosion pressure increase for the chemical igniters.

A European standard for an explosibility classification test is currently in preparation.

Group A (hazardous) - the dust cloud propagates flame from the ignition source and is classed as a combustible and potentially explosive material
Group B (non hazardous) - the dust cloud does not propagate flame from the ignition source and is classed as a non-combustible (non-hazardous) material

Group A dusts may form Zone 20, Zone 21 and Zone 22 hazardous areas, depending upon the frequency and duration of the explosive atmosphere.

   Example test results

 Sample

 Classification 

Explosible 

 coal dust

group A

yes 

 flour

group A

yes 

 sugar dust

group A

yes