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 Medium temperature asphalt tar distillation residue part of the production rate accounted for 54 to 56 percent of the tar, it is more than the tricyclic aromatic compounds and oxygen, nitrogen, sulfur-containing heterocyclic compounds and a small amount of polymer carbon material. Asphalt component of the molecular weight of between 200 and 2000 up to 3000. Medium temperature pitch is classified according to the softening point. The softening point of 65 ~ 90 ° C for medium temperature pitch.