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Solid or viscous hydrocarbon binder, made from natural hydrocarbons by distillation, oxidation or ?cracking', that contains a low proportion of volatile products, has characteristic binder properties and is soluble in carbon disulphide.
It is asphalt that is adequately refined to satisfy certain specifications established beforehand.
Asphalt bitumens are usually called hard bitumens, showing penetration ratings of between 20 and 300.
