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Blown bitumen grades or Oxidized bitumen are produced by passing air through the penetration grades. This process gives the bitumen more rubbery properties than its original formula and they are simply harder bitumen. It is mainly used for industrial purposes, such as roof insulation, flooring, industrial mastics, pipe coating, and paints and also for road construction.

We are offering our client an excellent quality range of Blown Grades. The consistency of bitumen is defined by means of two tests the penetration test & the softening point test. In practice the different grade are designed by their penetration. With increasing pen value during oxidation process was content in the bitumen reduces so that classic composer properties increase which behaves like rubber by that way deformation under road is increase. We are also capable of producing other grades of Blown Bitumen upon request by our customers.

Blown Bitumen Manufacturing Method

Blown Bitumen is produced by either Continuous or Staggered Blowing Process. Heated Penetration Grade Bitumen up to 300 deg C under controlled environment is blown with air in the Chimney / Tower. This process removes the Oil Content in the Bitumen and it is oxidized. Fuel oil is added to the process to make the penetration higher if it is required to do so. 

The blown bitumen, still at the higher temperature, to be handled carefully and packed into Bags or drums as required. The associated safety and workplace hazards need to be handled efficiently.

The different grades for suited applications produced are designated by two numbers to indicate the mid-points of their softening point and penetration ranges.

Oxidized Asphalt Manufacturing Method

Chemicals are added in order to decrease the time for the reaction time for blowing which shall have better control over the blowing conditions to produce different grades of Oxidized Bitumen with low capital investment.

Blowing is preferably done from the bottom of the Chimney/ Tower and the Temperature can be controlled by Water Jacketing.

Technical Advantages of Blown Bitumen or Oxidized Bitumen

  • Durability

  • Flexibility

  • Water Resistant

  • Chemical Stability


Packing is done when the final product temperature brought down to 160 degrees in bags with Moulds or in steel drum before it cools down to room temperature and become solid.


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