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A class of black or dark-colored solid, semisolid, or viscous cementitious substances, natural or manufactured, composed principally of high molecular weight hydrocarbons, of which asphalts, tars, pitches and asphaltites are typical; a generic term for an amorphous, semi-solid mixture of hydrocarbons derived from petroleum or coal; in the roofing industry there are two basic bitumens. coal-tar pitch and asphalt; before use, the bitumens are heated to a liquid state, dissolved with a solvent, or emulsified.

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