https://doi.org/10.1351/goldbook.P04814
An extremely well graphitizing carbon with a high degree of optical anisotropy (isochromatic areas of optical texture above about ) and which is characterized by a combination of the following properties which differ significantly from those of regular coke: high real density, low reversible thermal expansion and low ash content combined, in most cases, with low sulfur content.
Note: Premium coke is mainly produced from tars or residues from petrochemistry by the delayed coking process. Also, refined coal tar pitches are used as precursors for premium coke production.