calcined coke

A petroleum coke or coal-derived pitch coke obtained by heat treatment of green coke to about 1600 K. It will normally have a hydrogen content of less than 0.1 wt.%.
Calcined coke is the main raw material for the manufacture of polygranular carbon and polygranular graphite products (e.g. carbon and graphite electrodes).
PAC, 1995, 67, 473 (Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)) on page 479