Читать книгу Industrial Carbon and Graphite Materials - Группа авторов - Страница 209

PITCH is a residue from pyrolysis of organic material or tar distillation, which is solid at room temperature, consisting of a complex mixture of numerous, essentially aromatic hydrocarbons and heterocyclic compounds. It exhibits a broad softening range instead of a defined melting temperature. When cooled from the melt, PITCHES solidify without crystallization.