After oxidative polymerization of pith, its volatile matter is decreased from 52.22% to 16%, and its toluene insolublematter is increased from 30% to 81%.
It has no insolublematter separated out in storing for long term and no jamming in nozzle, and it may be used to print clear and homogeneous text and graph and without fading in water.
Pitches extracted -with supercritical toluene (SCFE pitch) contained none of the quinoline insoluble (QI) matter responsible for anisotropic structures with small unit sizes.