Sing Heng Seng Co., Ltd. provides a selection of coal from Sub Bituminous (5100 – 5500 kcal) to Bituminous (5600 – 5800 kcal). Sub Bituminous – Bituminous coal are typically softer, friable materials with a dull, earthy appearance. They have high moisture levels and low carbon content, and therefore have lower energy content.

Sub-bituminous coal ::
1. 5100 - 5300 kcal
2. 5400 - 5500 kcal

Bituminous coal ::
3. 5600 - 5800 kcal
4. 5900 - 6100 kcal ( Not available )