PT. Trust Coalindo Sukses offers four primary steam coal grades certified by independent surveyors including SUCOFINDO, SGS, CARSURIN, and Inspectorate. All specifications are per ASTM standards.
Grade 1 · GCV ARB ~3,800–3,600 Kcal/kg | Low-Rank Steam Coal
| Parameter | Basis | Typical | Rejection |
|---|
| Total Moisture | Arb | 38% – 40% | > 42% |
| Inherent Moisture | Adb | 14% – 16% | — |
| Ash Content | Adb | 4% – 6% | > 6% |
| Volatile Matter | Adb | 38% – 45% | — |
| Fixed Carbon | Adb | By diff. | — |
| Total Sulfur | Adb | 0.8% | > 1% |
| Gross CV | Adb | 5,300–5,100 Kcal/kg | < 5,100 Kcal/kg |
| Gross CV | Arb | 3,800–3,600 Kcal/kg | < 3,600 Kcal/kg |
| Net CV | Arb | 3,500–3,300 Kcal/kg | < 3,200 Kcal/kg |
| HGI | — | 55–65 | — |
Grade 2 · GCV ARB ~4,200–4,000 Kcal/kg | Sub-Bituminous
| Parameter | Basis | Typical | Rejection |
|---|
| Total Moisture | Arb | 34% – 36% | > 36% |
| Inherent Moisture | Adb | 14% – 16% | — |
| Ash Content | Adb | 6% – 8% | > 8% |
| Volatile Matter | Adb | 38% – 45% | — |
| Fixed Carbon | Adb | By diff. | — |
| Total Sulfur | Adb | 0.8% | > 1% |
| Gross CV | Adb | 5,500–5,300 Kcal/kg | < 5,300 Kcal/kg |
| Gross CV | Arb | 4,200–4,000 Kcal/kg | < 4,000 Kcal/kg |
| Net CV | Arb | 3,800–3,600 Kcal/kg | < 3,600 Kcal/kg |
| HGI | — | 55–65 | — |
Grade 3 · GCV ARB ~5,000–4,800 Kcal/kg | Medium Steam Coal
| Parameter | Basis | Typical | Rejection |
|---|
| Total Moisture | Arb | 26% – 28% | > 28% |
| Inherent Moisture | Adb | 10% – 12% | — |
| Ash Content | Adb | 8% – 10% | > 10% |
| Volatile Matter | Adb | 38% – 45% | — |
| Fixed Carbon | Adb | By diff. | — |
| Total Sulfur | Adb | 0.8% | > 1% |
| Gross CV | Adb | 5,800–5,600 Kcal/kg | < 5,600 Kcal/kg |
| Gross CV | Arb | 5,000–4,800 Kcal/kg | < 4,800 Kcal/kg |
| Net CV | Arb | 4,700–4,500 Kcal/kg | < 4,500 Kcal/kg |
| HGI | — | 50–55 | — |
Grade 4 · GCV ARB ~5,800–5,600 Kcal/kg | High-Rank Steam Coal
| Parameter | Basis | Typical | Rejection |
|---|
| Total Moisture | Arb | 16% – 18% | > 18% |
| Inherent Moisture | Adb | 10% – 12% | — |
| Ash Content | Adb | 12% – 14% | > 14% |
| Volatile Matter | Adb | 38% – 45% | — |
| Fixed Carbon | Adb | By diff. | — |
| Total Sulfur | Adb | 0.8% | > 1% |
| Gross CV | Adb | 6,300–6,100 Kcal/kg | < 6,100 Kcal/kg |
| Gross CV | Arb | 5,800–5,600 Kcal/kg | < 5,600 Kcal/kg |
| Net CV | Arb | 5,500–5,300 Kcal/kg | < 5,300 Kcal/kg |
| HGI | — | 45–55 | — |