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Engineering ToolBox > Dust Explosions and Critical Temperatures

Critical temperatures and concentration parameters for some common substances as coal, zinc, uranium and more

There are some basic rules to observe to see whether a dust is capable of causing a dust explosion:

• The dust must be combustible
• The dust must be airborne
• The dust must have a size distribution capable of flame propagation
• The dust concentration must be within the explosive concentration range
• An ignition source with high enough temperature must be present
• The atmosphere must contain sufficient oxygen to support and sustain combustion.

Critical temperatures and dust concentrations of some common substances where the explosion dangers are acute can be found in the table below.