Oxidized bitumen 90/40 or blown bitumen 90/40 is a semi-solid grade of blown bitumen produced from penetration grade 60/70. R 90/40 is manufactured by bitumen 60/70 aeration through very hot air.

Oxidized bitumen 90/40 has a high softening point and low needle penetration degree. Different grades of this type of bitumen are produced for various purposes that they are known with two numbers, one of them is softening point, and the other one is needle penetration level. These numbers are measured by an international test method named ASTM.

Technical properties:

Blown bitumen 90/40during air blowing operation gets rubbery property more than previous grades. R 90/40 softening point and penetration degree are measured by ASTM D36 and ASTM D5, respectively. For more information, please check the test data sheet out.


Oxidized Bitumen 90/40 (or Blown Bitumen R90/40) produced by our company, PUB-LTD CO., is used in numerous industrial applications and operations. It has rubber property more than previous grades; because of its particular property in oxidization procedure. It is used in the production of especial paints, civil works, construction, road construction, roofing, facing, flooring, as an anti-slip layer component, undercarriage sealant in the cars and automobile industry, in the pilling industry, electrical operations, cable coating, oil and gas pipelines coating, crack sealing, road repair operations, pulp papers, bituminous products, textile, joint filling compound, sound-reducing agent, dust proofing, waterproofing, lacquers, varnishes, pavements, fuel combination, and paving.

Also, it’s used as raw material for adhesive, insulation, isolation bitumen membrane sheet, chemical, especial bitumen-based paints and colors to protect metal structures from corrosion, hydraulic applications and operations, Portland cement pavements, as a base for synthetic turf, producing rubber and plastic production.


Heating Bitumen in most final uses is a critical stage. Generally, the most important thing in this procedure is heat control. Temperature and heat control can affect various aspects of the product, including its quality. The safe and recommended maximum temperature is 230℃.

All Oxidized Bitumen is not hazardous at below 100℃ during shipping operations. Heating and heat transfer should be control. Without good heat transfer may cause overheating and release low flash vapors, which these unwanted side products have a higher fire risk.

Also, melted bitumen should not be left in the boiler to get cold. Because it can cause overheating and needs more positional energy. Furthermore, placement and installing any temperature and pressure monitoring and control devices are very important. Because if their placement is not true, thermometers can’t display the real temperature that it can leads to poor monitoring and thermal conductivity.

Health/ Safety:

Everyone who works in Oxidized Bitumen plants should be wear gloves, masks (especial protective masks), and safety glasses. For more information, please refer to MSDS.


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