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What is Oxidized Bitumen?

What is Oxidized Bitumen (Blown Bitumen)?

Pars Bitumen Oxidized Bitumen is produced in different grades. The most well-known and highly applied grades of Oxidized Bitumen are 90/15, 10/20, 115/15, 85/25, 95/25 and120/15. At Pars Bitumen factory, Oxidized Bitumen is produced as a result of vacuum bottom oxidation in the presence of heat and blowing air into the vacuum Batuum towers. Oxidized Bitumen (blown bitumen), is a petroleum product, a hydrocarbon which has a high molecular weight including Oil, Resin and Asphaltene.

Oxidized Bitumen

Oxidized Bitumen

How is Oxidized Bitumen Produced?

Pars Bitumen Oxidized Bitumen or Blown Bitumen is produced by blowing hot air (with high temperature over 200 °C) into vacuum towers. This Bitumen sample enters the special tank in liquid form with high temperature and air is blown into it from the end of this tank with the help of perforated pipes. This process is carried out at a temperature between 200 °C. As the result, the presence of 5 to 30% asphaltene and due to the increase in the amount of asphaltene in its structure of bitumen, makes the oxidized bitumen harder than normal bitumen.

The abbreviation of blown or oxidized bitumen is R, for example, if bitumen is called R85/25, it means that it is blown bitumen with a penetration degree of 25 hundreds of a millimeter and a softening point of 85 degrees Celsius, wherever the word R is in front of the bitumen specifications, it indicates that the bitumen is Oxidized or Blown Bitumen.

How is Oxidized Bitumen Tested?

In the analysis of oxidized bitumen R90/15, R120/15, R115/15, R10/20, the ASTM test (bitumen permeability degree), which is an international test, indicates the type of bitumen oxidized or blown in different grades.


oxidized Bitumen 115/15

oxidized Bitumen 115/15

What are the Applications of Oxidized Bitumen?

Types of Blown Bitumen due to having a low penetration degree and having a high softening point degree, which makes it resistant to sunlight or high heat, and having a suitable property (oxidized bitumen) for industrial use and for the production of waterproofing, Insulation of oil and water pipes, battery production and insulation of the floor and body of cars are used to prevent rotting.


Oxidized Bitumen is a very highly applicable derivative of Bitumen recently. One of the benefits of using Oxidized Bitumen is that it is packed in small 25 kg bags normally, and it is easy to be used in different areas. This type of bitumen is softer than pure bitumen and is also much more resistant to temperature changes and has a lower penetration coefficient than pure bitumen.