Penetration bitumen 35/50 is made by vacuum aerating a distillation tower, and its permeability range anywhere from 35 to 50. Its name comes from the fact that its permeability can fall anywhere in that range. The manufacturing of liquid bitumen, the insulation business, and the building construction sector are the three industries that make the most frequent use of this kind of bitumen.

The usage of bitumen 35-50 is at its most effective in climates that are subtropical as well as highly arid. This fractional-vacuum-destination crude oil is used as the beginning material in the production of petroleum grade bitumen, which is then refined into the desired product. The vacuum residual feedstock is used in the manufacturing process in order to produce the bitumen penetration grade 35/50 that is provided by Petro Naft Co.

The penetration test is the basis for deriving the definition of the bitumen grade known as the penetration grade. Only the penetration range is used to derive the designation. The depth to which a standard-loaded needle would vertically penetrate in five seconds in a sample of bitumen kept at a temperature of 25 degrees Celsius is used to assess penetration, which defines the hardness of bitumen. This depth can be found by taking the average of the depths to which the needle would vertically penetrate in each of the five seconds.


The Petro Naft Corporation manufactures the penetration bitumen known as bitumen 35/50. This firm is renowned for providing top-notch bitumen products that are utilized in several applications, such as waterproofing, roofing, and road building.

The penetration grade of Bitumen 35/50 is one of its key characteristics. This grade identifies the degree of hardness or softness of the bitumen and is based on the depth, measured in tenths of a millimeter, to which a standard needle will pierce the substance under certain temperature, time, and loading circumstances. When it comes to bitumen 35/50, the penetration grade is between 35 and 50.

This kind of bitumen has a great resistance to deformation and can endure severe traffic loads, making it perfect for usage in regions with moderate to high temperatures. It is a great option for use in asphalt mixtures because of its outstanding adhesive qualities as well.

The sophisticated refining procedure used to create bitumen 35/50 comprises the removal of impurities and other undesired components from crude oil. This procedure makes sure the final product is of the highest quality and complies with all regulations.

We produce penetration bitumen 35/50 of the best quality in a variety of types and export them from Iran and the United Arab Emirates to other nations worldwide.

  • Iran Penetration Bitumen 35/50 ( Iran Bitumen 35/50 )
  • Emirates Peneteration Bitumen 35/50 ( Emirates Bitumen 35/50 )


Due to the fact that it is thermoplastic, penetration bitumen 35/50 will become more flexible when it is subjected to high temperatures and will become stiffer when it is exposed to cold temperatures. The kind of crude oil that is refined into bitumen as well as the refining process itself are both potential factors that might influence the manner in which bitumen behaves in terms of temperature and stiffness.

  • Stability in the environment
  • Extended service life
  • Extremely strong adhesion to the overwhelming majority of different materials


Bitumen 35/50Test methodUnitSpecification
Penetration – 25°C, 100g, 5sEN 1426mm35-50
Softening Point (Ring & Ball)EN 1427°C50/58
Kinematic Viscosity @ 135⁰CEN 12595mm²/s370 Min
Penetration IndexEN 12591-1.5 +0.7
Solubility in XyleneEN 12592%99 Min
Flashpoint (Cleveland Open)EN 22592°C240 Min
Recistance to Hardening at 163 °C   
Change in mass (m/m)EN12607-1%0.5 Max
Retained Penetration 25°C, 100g, 5s (% of original)EN 1426%53 Min
Increase in softening pointEN 1427°C8 Max


Paving grade bitumen, often referred to as bitumen penetration 35/50, is a penetration grade of bitumen that is used in the building and maintenance of highways. This grade of bitumen is considered to be of a medium-to-hard hardness. This grade of bitumen is used the vast majority of the time in the production of hot mix asphalt, which is utilized for bases and wearing courses, respectively. Bitumen penetration 35-50 is one of the most prevalent grades of bitumen, and it is employed as a vital component in the creation of all other bituminous products.

Petro Naft manufactures the highest quality Penetration Bitumen 35.50 in different types and exports it from Iran and the UAE to other countries around the world.

  • Penetration Bitumen 35/50 Iran
  • Penetration Bitumen 35/50 UAE


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