Dust Explosions - Critical Temperatures and Concentrations

Critical temperatures and concentration parameters for substances like coal, zinc, uranium and more

Basic rules to observe for dust to be 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 concentrations:

SubstanceIgnition Temperature of Dust Cloud
(oC)
Minimum Explosive Concentration
(oz/ft3)
Relative Explosion Hazard
Alfalfa 460
Aluminum 650 0.045 Severe
Al-Mg alloy 0.02 Severe
Cereal grass 550
Chromium 0.23 Strong
Coal 610 0.055 Strong
Copper 900 Fire
Corn 400
Epoxy Resin 530 0.020 Severe
Flax shive 430
Grain dust, winter wheat, corn, oats 430
Iron 420 0.100 Strong
Magnesium 520 0.020 Severe
Rice 440
Silicon 0.11 Strong
Soy flour 540
Tin 630 0.190 Moderate
Titanium 460 0.045 Severe
Uranium (finely divided metal dust) 20 0.060 Severe
Wheat flour 380
Wheat straw 470
Zinc 600 0.480 Moderate
  • missing data not available at the moment
  • 1 ft3 = 0.02832 m3= 28.32 dm3 = 0.03704 yd3 = 6.229 Imp. gal (UK) = 7.481 gal (US) = 1,728 Cu.In.
  • 1 oz (ounce) = 28.35 g = 437.5 grains = 0.0625 lb = 0.0000279 long ton (UK) = 0.00003125 long ton (US) = 0.000558 long hundredweight (UK) = 0.000625 long hundredweight (US) = 0.004464 stone = 16 dram

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