Description Moisture Content Total moisture (arb): 14-16% max, rejection at 18%. Inherent moisture (adb): 12-14% approx. Ash Content Ash content (adb): 10-16% max. Volatile Matter Volatile matter (adb): 38-45%. Fixed Carbon Fixed carbon (adb): by difference. Sulfur Content Total sulphur (adb): 0.8-1.0% max. Hardgrove Grindability Index Hardgrove grindability index (hgi): 45-50 typical. Size Specification Size: 0 to 50 mm (90%). Calorific Value Net calorific value (arb): 5500-5300 kcal/kg, rejection at 5300 kcal/kg.