Coal Specification


We trade various grades of thermal coal of Indonesian origin ranging from – GAR 3400 kcal/kg, GAR 4200 kcal/kg upto GAR 6800 kcal/kg.

The table below indicates the typical specifications of each category of coal under the ASTM standards.

Specification in ASTM Standard Low Calorific Value Mid-Low Calorific Value Medium Calorific Value High Calorific Value
Gross Calorific Value GAR 3,400 Kcal/kg 4,200 Kcal/kg 5,000 Kcal/kg 6,800 Kcal/kg
Net Calorific Value NAR 3,000 Kcal/kg 3,800 Kcal/kg 4,700 Kcal/kg 6,400 Kcal/kg
Total Moisture ARB 44% 36% 26% 8%
Inherent Moisture ADB 14% 24% 18% 8%
Ash Content ADB 8% 8% 5% 10%
Volatile Matter ADB 42% 40% 40% 42%
Total Sulfur ADB 0.2% 0.8% 0.9% 3%
HGI - 55 45 40 55
Size 0-50mm - 90% 90% 90% 90%
Ash Fusion Temperature T1 1,180 Degree Celsius 1,150 Degree Celsius 1,150 Degree Celsius 1,250 Degree Celsius