Don't be mislead in dust explosion classifications that a St 1 (weak explosion) is less severe than a St 3 (very strong explosion) in human causalities and property damage as the result of catastrophic dust explosions.

1. Don’t Be Mislead
Dust Explosion Classes (St 1, St 2, St 3)
Photo: CSB
Imperial Sugar Refinery
Combustible Dust Policy Institute

2. Dust Explosion Classes
Dust explosion Kst (bar.m/s) Characteristic Material
class
St 0 0 No explosion Silica
St 1 >0 and
Weak Powdered milk,
<=200 charcoal, sulfur,
explosion sugar & zinc
St 2 >200 and Strong Wood Flour
<=300 explosion
St 3 >300 Very
Aluminum, &
Strong Magnesium
explosion
Combustible Dust Policy Institute

3. A Weak Explosion?
St 1
SUGAR DUST EXPLOSION
14 Killed, 36 Injured
Imperial Sugar Refinery
PORT WENTWORTH, GEORGIA
FEBRUARY 7, 2008
Photo: CSB
Combustible Dust Policy Institute

4. Thank You!
Combustible Dust Policy Institute