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Classification of Coal by Rank (ASTM D388-12)
July.27 Coal
| Classification of Coal by Rank (ASTM D388-12) | ||||||
| Coal Rank | Fix Carbon Limits | Volatile Content | Gross Calorific Value Limits | Agglomerating Characteristics | ||
| % | % | Btu/lb | MJ/kg | |||
| dmmf | dmmf | Moisture mmf | moisture mmf | |||
| Antracite Class | Meta- Anthracite | ≥98% | <2% | Non-agglomerating | ||
| Anthracite | 92 to 98% | 2 to 8% | ||||
| Semi-Anthracite (Lean Coal) | 86 to 92% | 8 to 14% | ||||
| Bituminous | Low Volatile Bituminous | 78 to 86% | 14 to 22% | Commonly agglomerating | ||
| Medium Volatile Bituminous | 69 to 78% | 22 to 31% | ||||
| High Volatile A Bituminous | <69% | >31% | ≥14,000 | ≥32.557 | ||
| High Volatile B Bituminous | <69% | >31% | 13,000 to 14,000 | 30.232 to 32.557 | ||
| High Volatile C Bituminous | <69% | >31% | 11,500 to 13,000 | 26.743 to 30.232 | ||
| High Volatile C Bituminous | >31% | 10,500 to 11,500 | 24.418 to 26.743 | Agglomerating | ||
| Subbituminous | Subbituminous A coal | 10,500 to 11,500 | 24.418 to 26.743 | Non-agglomerating | ||
| Subbituminous B coal | 9,500 to 10,500 | 22.09 to 24.418 | ||||
| Subbituminous C coal | 8,300 to 9,500 | 19.30 to 22.09 | ||||
| Lignite | Lignite A | 6,300 to 8,300 | 14.65 to 19.30 | Non-agglomerating | ||
| Lignite B | <6,300 | <14.65 | ||||
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| Note : Calculating sulfur trioxide that is determined in accordance with ASTM D5016-08, dmmf:dry mineral-matter-free basis , moisture mmf : moisture mineral-matter free basis | ||||||
