It is safe to use without spark and anti-explosive. Specifications working air pressure: 3.04.0Bar Blade: 4 2 Shaft size: 16 950 mm Motor: Pneumatic Mixing capacity: 50 Gallon /200L Tank Power: 1/2 HP Blade mterial: stainless steel Axial diameter:15mm Blade diameter:160mm Interface caliber:G1/4 Total height:113cm/44.49in Feature 304 Stainless Steel Blade, Shaft and Coupler Easy Cleanup Augers High Solids Reduces Mix Time by 50%-80% Decreases Air & Electric Consumption by 50%.