filler coke

https://doi.org/10.1351/goldbook.F02364
The main constituent of a carbon artifact, introduced as solid component (predominantly in the form of particulate carbon ) into the 'carbon mix' from which polygranular carbon and graphite materials are obtained by heat treatment.
Note:
@F02363-1@ @C01142@ is not necessarily the only, but it is commonly the most important @F02363-2@ material used in a '@C00842@' which consists of @F02363-2@ and @B00646@.
Source:
PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 489 (https://doi.org/10.1351/pac199567030473)