Wikipedia - Мезогенний пек mesogenic pitch

https://doi.org/10.1351/goldbook.M03841
A @P04677@ with a complex mixture of numerous essentially aromatic @H02889@. It does not contain anisotropic particles detectable by optical microscopy. Mesogenic @P04677@ is low in quinoline-insoluble fractions and capable of transforming into @M03850@ during continuous heat treatment above $$750\ \text{K}$$ by the formation of optically detectable @C00822@.
Source:
PAC, 1995, 67, 473. (Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)) on page 496 [Terms] [Paper]