Bitumen exists primarily of highly molecular hydrocarbons (aliphatisch and fragrantly) and contains of the other chemically engagedly in low shares sulphur, oxygen, nitrogen and some tracks of metals. It is practically indissoluble in water (hydrophob) and, hence, is used, for example to protect sensitive materials and components by water. Bitumen belongs to the thermo-sculptural materials, that is his viscosity is dependent on temperature: While cooling it becomes friable, with warming it goes through infinitely variable all states from firmly (glassy) about viscous liquidly to thin-liquidly. At rising temperatures it starts decomposing slowly. Bitumen orders of no steady glaze point as for example water because the numerous components of the hydrocarbon mixture own different glaze points, but it has a glaze area.

Compared with water it is very stable (hydrophob). Many years' water effects can be proved in practice only in the surface. Besides, bitumen behaves chemically solidly compared with non-oxidising acids and bases, however, is ignitable at higher temperatures. Bitumen is partially dissolvable in liquid hydrocarbons, as for example petrol, diesel, to oils or others.

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