https://doi.org/10.1351/goldbook.P04814
An extremely well graphitizing carbon with a high degree of optical ) and which is characterized by a combination of the following properties which differ significantly from those of
anisotropy
(isochromatic areas of optical texture above about regular coke
: high real density, low reversible thermal expansion and low ash content combined, in most cases, with low sulfur content.Note:
Premium
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.