Description of OXIDIZED BITUMEN 75/25

When pure bitumen (pure bitumen is identical to penetration bitumen 60/70) is blown over, it transforms into oxidized bitumen 75/25, also known as blown asphalt 75/25 or blown bitumen 75/25. It has a lower penetration grade and a greater softening point when compared to pure bitumen. The asphaltene in this bitumen polymerizes as a result of wind, turning it into a flexible bitumen. This bitumen is known as Rubberized Bitumen because of its rubber component, as the letter R indicates. The penetration level and softening point are shown by these numbers. For instance, the specification Oxidized Bitumen R75/25 states that this bitumen has a penetration grade of 25 and a softening point of 75.

We manufacture the highest quality Oxidized Bitumen 75/25 ( Blown Asphalt 75/25 ) in different types and export them from Iran and the UAE to other countries around the world.

  • Oxidized Bitumen 75/25 Iran ( Blown Asphalt 75/25 Iran )
  • Oxidized Bitumen 75/25 UAE ( Blown Asphalt 75/25 UAE )


In order to produce oxidized bitumen 75/25, the BBU reactor at the refinery must first heat penetration grade bitumen to a temperature that falls somewhere between 220 and 230 degrees Celsius. As a consequence of the air being heated up in the reactor, the hydrogen atoms in the bitumen interact with the oxygen atoms in the air. The next step involves the generation of some steam, which must be evacuated from the oxidation chamber. As a result, there is still 75/25 oxidized bitumen present.


The main advantages of Oxidized Bitumen 75/25 are as follows:

Complete water resistance; extreme pliability; durability; chemical stability.


Bitumen 75/25Test methodUnitSpecification
Specific gravity @25/25 CASTM D70(Kg/m3)1.05 approx.
Penetration @ 25°cASTM  D5mm/1020/30
Softening point °cASTM  D36°C70/80
Loss on heating(wt) %ASTM  D6Wt. %0.2 max
Flashpoint cASTM D92°C250 min
Solubility is CS2(wt) %ASTM  D4Wt. %99.5 max
Spot testA.A.S.H.T.O 102Negative

Applications of OXIDIZED BITUMEN 75/25

Road construction, hydropower projects, roofing, flooring, mastics, the oil and gas sectors, and electrical applications are just a few of the uses for oxidized bitumen 75/25.

  • Roads: Oxidised bitumen 75/25 is suitable for paving, constructing, and maintaining roads. It can be added to asphalt for parking lots, railways, highways, and other surfaces.
  • Hydro projects: A substance called oxidized bitumen 75.25  is used to line canals. This kind of bitumen can be utilized for further hydro projects, including constructing embankments and dams, hydraulic structures, protecting dam linings, and stabilizing sand.
  • Roofing: In roofing felts, shingle roofs, damp-proof coating compositions, carriage roofing compounds, liquid roof coatings, and plastic cements, blown asphalt 75-25 is used. It is often the best solution for waterproofing roofs.
  • Flooring: One of the main uses for blown bitumen 75-25 is flooring. Acid- and alkali-resistant bitumen mastic can be used to stop corrosion on the surface of chemical plants, fertilizer plants, steel factories, and other facilities. Additionally, it has the ability to restore parquet floors.
  • Oil and gas industry: To prevent pipeline corrosion and rust, oxidized bitumen 75-25 is often used in addition to cutback bitumen MC30.
  • Bitumen 75/25 is used as a laminated board adhesive in the electrical industry. The ability to seal electrical junction boxes is present. It is used in cables, lithium-ion batteries, and the cable industry.

Petronaft produces oxidized bitumen 75/25 ( blown asphalt 75/25 ) of the best quality in a variety of types and exports it from Iran and the United Arab Emirates to other nations worldwide.

  • Iran Oxidized Bitumen 75/25 ( Iran Blown Asphalt 75/25 )
  • Emirates Oxidized Bitumen 75/25 ( Emirates Blown Asphalt 75/25 )

Packing of OXIDIZED BITUMEN 75/25

25Kg Kraft Bag, 25Kg Polyamide Bag, Carton, Drum, and Bulk.

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