RB1 / API4 MATERIAL SPECIFICATIONS Nominal Calorific Value - 6000kcal/kg Minimum Calorific Value - 5850kcal/kg Total Moisture (ARB) - 12% max Volatile Material (ARB) - 22% min Ash (ARB) - 15% max Sulphur - 1% max HGI - 45-70 Nominal Topsize - 50mm or smaller