Bitumen VG30 Akam

Black adhesives include bitumen and tar material. Today, two types of bitumen and petroleum are used in the building. Notable general features of black adhesives are: water and water impermeable, electrical insulation, acid, base and salt resistance, elasticity, adhesion to other materials and the formation of thin films on them. Black adhesives, on the other hand, have disadvantages, such as decomposing to high heat and converting them to charcoal, loss of adhesion in humid and polluted environments, and soft and deformable materials and against pressure and some solvents.

Pure bitumens come from refining crude oil. Due to heating of crude oil, gasoline, petroleum solvents, light petroleum, gas oil and other light oils it is separated in refinery distillation towers and remains in bitumen over 380 ° C (under normal pressure). Which is either solid or semi-solid. If the distillation is done in a vacuum, the heat is reduced. Crude oil is divided into types of asphaltic, paraffinic and paraffinic asphaltic. Most crude oils equivalent to Iran are paraffinic asphaltic. Bitumen from asphaltic oil is best suited for road construction. With special methods of paraffin, paraffinic bitumens are removed and used in road construction.