carbon mix 

https://doi.org/10.1351/goldbook.C00842
A mixture of filler coke, e.g. grains and/or powders of solid carbon materials and a carbonaceous binder and selected additives, prepared in heated mixers at temperatures in the range of 410445 K as a preliminary step for the formation of shaped green bodies.
Source:
PAC, 1995, 67, 473. (Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)) on page 483 [Terms] [Paper]