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sci.blast-powder-factor Calculator
Calculates explosive powder factor (kg/m³ or kg/tonne) and specific energy from blast design parameters including burden, spacing, hole diameter, and charge length. Powder factor typically 0.1–0.5 kg/t for bench blasting in hard rock — too low gives poor fragmentation; too high gives excessive fines and fly rock.
Inputs
Explosive Mass Kg
Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
Burden M
Reference formula or conversion factor shown for context.
Spacing M
Reference formula or conversion factor shown for context.
Bench Height M
Vertical measurement. For health calculators, typically standing height without shoes.
Rock Density T M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Results
powder factor (kg/t)
A dimensionless multiplier applied in the calculation.
rock volume per hole (m³)
The computed three-dimensional volume.
tonnage per hole (t)
Sample size or count used in the calculation.
powder factor (kg/m³)
A dimensionless multiplier applied in the calculation.
PF = explosive mass / tonnage
The computed mass of the object or substance.
typical range
The difference between the maximum and minimum values.