Oxidized bitumen

What is oxidized bitumen?

Oxidized bitumen or blown bitumen is a type of bitumen that is produced by vacuum baton aeration. This type of bitumen with low penetration and high softening point is used for production and also for sealing.

The penetration of Oxidized bitumen is lower than pure bitumen and shows this kind of bitumen is softer and has lower sensitivity to temperature variations.

The symbol of oxidized bitumen is R. It means R 80/25 bitumen has a softness degree of 80 centigrade and a penetration degree of 25.


How to make oxidized bitumen?

In the process of blowing air in to oxidize petroleum bitumen is produced oxidized bitumen. This kind of bitumen with a high degree of softness is suitable for having elasticity even in the cold. 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 name of oxidized bitumen is formed.


Applications of Oxidized or blown bitumen:


Oxidized Bitumen uses in Oil and Gas industries for using as coating materials for pipelines and joints of oil and gas pipelines.

Another usage for Oxidized Bitumen is in electrical industries as a sealant of wire coating. Also, blown bitumen is used for waterproofing like building roofing feels in factories as the first material components for producing waterproofing roofing felt sheets.

Oxidized bitumen is used in bitumen and asphalt factories for road paving and another application of blown bitumen would be in the sound-dampening layer as one of the main materials for making sound insulation layers.

In summary, Oxidized (blown) bitumens are mostly used in industrial applications such as waterproofing of roof and floor construction, tires, pipe coating, paint, etc.

Properties of oxidized bitumen:

These types of bitumen are categorized and coded according to the softening point and penetration degree, for example, 85/40 bitumen is an oxidized bitumen that has a softening point of 85±5 °C and a penetration degree of 40±5 dmm. 

Oxidized bitumens also comply with the standards of solubility and weight loss due to heat. The softening points of oxidized bitumen are much higher than their corresponding penetrating bitumen. As a result, the thermal sensitivity of oxidized bitumen is much higher. For example, their penetration index is much higher and between +2 and +8.


Types of oxidized bitumen:

Oxidized bitumen has different grades that are used for many purposes.

The most grades are:

  • Oxidized bitumen R 75/30
  • oxidized bitumen R 95/25
  • oxidized bitumen R 85/25
  • oxidized bitumen R 90/40
  • Oxidized bitumen R 105/35
  • oxidized bitumen R 115/15
  • Oxidized bitumen R 75/30

Generally, Oxidized bitumens are used in industrial applications such as roof and floor waterproofing, tires, pipe coating, paint, etc.

Oxidized bitumen 75/30 is obtained from flexible bitumen when in response to wind, this bitumen polymerizes.

Oxidized Bitumen R75/30 has a specification that shows it has a penetration grade of 30 and a softening point of 75.

Oxidized bitumen 75/30 is used in many industries, for instance, road building, hydropower projects, roofing, flooring, mastics, the oil and gas industries, and electrical applications, too.

  • Oxidized bitumen R 95/25

Oxidized bitumen 95/25 is a standard blown bitumen commonly used for various purposes in construction work. This type of bitumen is usually used as a basic raw material for covering steel pipes and all kinds of waterproofing.

Oxidized bitumen is produced from penetrating bitumen which is blown in a controlled process by hot air to achieve the desired specifications. 


Grand petroleum company can provide oxidized bitumen in the:

  • Drum
  • Bulk


Grand Petroleum Company is ready to cooperate and provide your requests for sale in the domestic and foreign markets (exports).

For more information, please contact us.

  • Oxidized bitumen R 85/25

Oxidized bitumen 85/25 is the most widely used type of bitumen in the construction industry, and the main grade of this type of bitumen is 85/25 bitumen.

Oxidized bitumen 85/25 has a softening point of 85 and its penetration degree is 25. Among the types of oxidized bitumen, this bitumen is widely used and very popular in the market for paving, road maintenance, embankments, dams in water projects, the roofing industry, flooring, tile of bathrooms, coating pipelines, lithium battery, glue for laminate boards, etc.

  • Oxidized bitumen R 85/40

Oxidized bitumen 85/40 is based on petroleum bitumen made by blowing 60/70 bitumen with very hot air.

Oxide bitumen 85/40 is used in making waterproofing layers, asphalt clays, sealing roofs, mastics, pipe coating, paint, even road asphalt, and many other things.

  • Oxidized bitumen R 105/35

Oxidized bitumen R 105/35, which is the result of the oxidation of penetrating bitumen exposed to very hot air, is completely hard at ambient temperature and requires a lot of heating to use it. 

Oxidized bitumen 105/35 is used in civil engineering, construction, road operations, crack sealing, road repairing, roofing, flooring, coating, protecting pipelines, insulation, and sealing buildings. 

Also, R 105/35 is used in petroleum operations for coating oil and gas pipelines as a carriage sealant and soundproofing material in cars, in very hot or very cold weather conditions.

Oxidized bitumen 105/35’s in combination with gilsonite can maintain asphalt stability. Also, its combination as we said with gilsonite can prevent deformation and crack due to changing climates.

  • Oxidized bitumen R 115/15

Oxidized bitumen 115/15 is obtained from the reaction of hot bitumen with oxygen. Bitumen aeration is a process in which hot liquid bitumen is exposed to air.

Blown bitumen 115/15 is used in making waterproofing layers, asphalt clays, sealing roofs, mastics, pipe coating, paint, even road asphalt, and many other things.

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