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Bitumen is a by-product in the production of fuel. Normally, it is produced during the distillation of specific heavy crude oils. Different crude oils and refinery configurations produce different bitumen types, which can be further modified by the addition of polymers in order to enhance performance. Bitumen is mainly used in the production of asphalt, where it serves as an adhesive binding the other materials together. The remainder of bitumen production goes into various industrial applications.