Combustible Dust Classifications

Dust Explosion Class Kst Characteristic
St-0 0 Not explosive
St-1 <200 Weak to Moderately Explosive
St-2 200-300 Strongly Explosive
St-3 300+ Very Strongly Explosive

Explosibility Properties of Common Metals

Material Median Diameter (µm) Kst (bar-m/s) Pmax (bar g)
Aluminum <10 515 11.2
Bronze 18 31 4.1
Iron 12 50 5.2
Iron (carbonyl) <10 111 6.1
Manganese (electrolytic) 16 157 6.3
Magnesium 28 508 17.5
Magnesium 240 12 7
Niobium 80 238 6.3
Niobium 70 326 7.1
Silicon <10 126 10.2
Silicon (from dust collector) 16 100 9.4
Tantalum 100 149 6.0
Tantalum 80 97 3.7
Tantalum 50 108 5.5
Tantalum 65 129 5.8
Titanium ~25 - 4.7
Titanium 10 - 4.8
Zinc (from collector) <10 125 6.7
Zinc (from collector) 10 176 7.3
Zinc (from collector) 19 85 6

Case Study: "Low-Cost" Dust Collector Filters Cost More in the Long Run

"Low-Cost" Dust Collector Filters Cost More in the Long Run While the sticker price of standard replacement dust collector filters may seem appealing, they often come with hidden costs.