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Dust Explosions - Critical Temperatures and Concentrations

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

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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:

Substance	Ignition Temperature of Dust Cloud (^oC) Load Calculator!	Minimum Explosive Concentration (oz/ft³) Load Calculator!	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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Related Topics

Miscellaneous - Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more.
Temperature Measurement - Measurment of temperature - probes, sensors and transmitters.
Risk, Reliability and Safety - Risk, reliability and safety in process control systems.
Material Properties - Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.

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Flame Temperatures - Gases - Adiabatic flame temperatures for common fuel gases - propane, butane, acetylene and more - in air or oxygen atmospheres.
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Fuels and Chemicals - Autoignition Temperatures - Autoignition points for fuels and chemicals like butane, coke, hydrogen, petroleum and more.
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Hazardous Areas - Protection Techniques according European IECEx - Hazardous areas protection techniques - explosion proof, flameproof and intrinsically safe.
Hazardous Areas Protection Techniques for North America - Dust-ignition proof, explosion proof, instrinsically safe and nonincendive protection of hazardous areas.
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