The Dangers of Combustible Dust

Combustible dust is typically defined as any fine material that has the ability to catch fire and explode when an ignition source is present. While the type of combustible dust may differ depending on the workplace, common examples include dust created by wood, agricultural products, metals, chemicals, pesticides, rubber, textiles and plastics.

Blasts caused by combustible dust can be especially dangerous due to the fact that, after ignition, there are often two explosions that occur—primary and secondary. Primary explosions occur when accumulated dust ignites which, in turn, creates a large dust cloud. Secondary explosions, which can be even more devastating, are when this dust cloud ignites.

The following conditions need to be present in order for a blast to occur:

1. A combustible dust
2. A concentrated dispersion of the dust in the air
3. Enough oxygen to cause and sustain a fire
4. An ignition source
5. A form of confinement or enclosure that allows pressure to build

To mitigate the risks of combustible dust, it’s critical you practise good housekeeping. Employees should be trained to look for combustible dust hazards and have access to the cleaning equipment necessary to address them.

Using a vacuum, wet rag or broom can help prevent combustible dust from accumulating. Be especially mindful of combustible dust accusation hot spots, like flat surfaces, pipes, ductwork or cable trays.

Courtesy of Dan Lawrie Insurance Brokers.