coal-tar pitch

noun

a residue left by the distillation of coal tar: a mixture of hydrocarbons and finely divided carbon used as a binder for fuel briquettes, road surfaces, and carbon electrodes

The felt was stuck together in 3-ply mats on the surface with hot coal-tar pitch.

They are made from the low-grade coals, culm, slack and lignites, blended with coal-tar pitch.

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