We exclusively trade thermal coal of Indonesian origin and offer three main calorific values â GAR 4200 kcal/kg, NAR 4700 kcal/kg and NAR 5500 kcal/kg. The table below indicates the typical specifications of each category of coal under the American Society for Testing and Materials Standard.
Specification in ASTM StandardLow Calorific ValueMedium Calorific ValueHigh Calorific Value
Gross Calorific Value | GAR | 4,200 Kcal/kg | 5,000 Kcal/kg | 5,800 Kcal/kg |
Net Calorific Value | NAR | 3,800 Kcal/kg | 4,700 Kcal/kg | 5,500 Kcal/kg |
Total Moisture | ARB | 36% | 26% | 14% |
Inherent Moisture | ADB | Approximately 24% | 18% | 9% |
Ash Content | ADB | 8% | 5% | 15% |
Volatile Matter | ADB | Approximately 40% | 40% | 41% |
Ash Fusion Temperature | T1 | 1,150 Degree Celsius | 1,150 Degree Celsius | 1,300 Degree Celsius |
Total Sulfur | ADB | 0.8% | 0.9% | 0.6% |
HGI | - | Minimum 45% | 40% | 40% |
Size 0-50mm | - | Approximately 90% | 90% | 90% |