Warning - explosive atmosphere present
Explosion Testing for dust, gases & vapours
© EHTL June 2015

Classification test

Hazard classification test for combustible dust

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 (800oC) 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 explosibility classification test is currently in preparation (IEC 80079-20-2 Explosive atmospheres - Part 20-2: Material characteristics -- Combustible dusts test methods). 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.
Warning - explosive atmosphere present
Explosion Testing
© EHTL June 2015

Classification test

Hazard classification test

for combustible dust

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 (800oC) 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 explosibility classification test is currently in preparation (IEC 80079-20-2 Explosive atmospheres - Part 20-2: Material characteristics -- Combustible dusts test methods). 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.