Coal
Coal is also graded based on its gross calorific value (GCV):
Grade G-3: GCV band of 6400–6700 kcal/kg
Grade G-4: GCV band of 6100–6400 kcal/kg
Grade G-5: GCV band of 5800–6100 kcal/kg
Grade G-6: GCV band of 5500–5800 kcal/kg
Coal is also graded based on its gross calorific value (GCV):
Grade G-3: GCV band of 6400–6700 kcal/kg
Grade G-4: GCV band of 6100–6400 kcal/kg
Grade G-5: GCV band of 5800–6100 kcal/kg
Grade G-6: GCV band of 5500–5800 kcal/kg