R Grade

تاریخ انتشار : 2018/02/06

R Grade

In order for petroleum bitumen with a high degree of softness to have elasticity even in the cold, air is blown into it to oxidize it. Blowing hot air into pure bitumen in the last stage of the purification process results in rubbery grade bitumen. In this process, hot air with a temperature of 200 to 300 degrees Celsius is blown into the chamber containing bitumen through perforated pipes. As a result of this process, the hydrogen atoms in the hydrocarbon molecules of bitumen are combined with the oxygen in the air, and with the formation of water, the sintering action takes place and bitumen with the properties of mineral bitumen is formed. Pure bitumen is obtained at the last stage of the purification process.

In this process, hot air with a temperature of 200 to 300 degrees Celsius is blown into the chamber containing bitumen through perforated pipes. As a result of this process, the hydrogen atoms present in the bitumen hydrocarbon molecules are combined with the oxygen in the air, and with the formation of water, the sintering process takes place. Compared to pure bitumen, blown bitumen has a lower degree of penetration, a higher degree of softness and less sensitivity to temperature changes. This type of bitumen is mostly used in making roofing sheets, car batteries and plating. The abbreviation of blown bitumen is R. For example, bitumen 80/25 R means blown bitumen with 80 degree of softness and 25 degree of penetration.