Bitumen specification

Bitumen specification

We highly relate bitumen specification to the bitumen type whether it’s pure,

and the refining process. Generally speaking, they obtained some types

of bitumen in nature due to the gradual conversion of crude oil and

Also , the evaporation of its volatiles over years. This type is called natural bitumen

and is more durable than oil bitumen. In fact, it exists in pure form in nature

(lake bitumen), such as Behbahan Iran bitumen lake and

American Trinidad bitumen lake, or it is mined (mineral bitumen).

More about Bitumen types

Blown bitumen has different bitumen specification due to its different processes.

So , They get this type by blowing hot air into pure bitumen in the ultimate

stage of purification. In this process, hot air at a temperature of 200 to

300 ° C blows into the bitumen chamber by perforated pipes. As a result of

this process, the hydrogen atoms in the molecules of the bitumen

hydrocarbons combine with the oxygen in the air, and by the formation of

water, the polymerization takes place.

Moreover, blown bitumen has a lower penetration than pure bitumen, has a higher

softness, and is less sensitive to temperature changes. This type of bitumen

highly applies in making roofing sheets, car batteries, and plating. It is

important to know that the abbreviation for blown bitumen is R. For

example, 80/25 R bitumen means blown bitumen with the softness

of 80 and penetration of 25.


Natural Bitumen


Bitumen specifications and the market

Mixed bitumen is a mixture of bitumen and a suitable solvent

(eg kerosene or gasoline). As a matter pf fact, this bitumen is liquid at room temperature or

liquefies at low temperatures. Mixed bitumen applies in types of paving

and macadam asphalts. The setting or hardening rate of this type of

bitumen depends on the type of solution. For example, due to the high

rate of evaporation of gasoline, the bitumen dissolved in gasoline hardens faster.

so , This bitumen is hardening bitumen (RC). Bitumen that dissolves in oil is

also bitumen (MC). Additionally, bitumen that dissolve in gas oil or furnace oil are

retardant oil (SC). They based soluble bitumen grades on their viscosity. Bitumen specification makes it suitable for both road construction and insulation.

About 90% of the bitumen produced has applications in road construction

however, insulation costs account for only 10% of bitumen consumption.

Bitumen specification allows it to insulate roofs and bathroom floors.

The substance is appropriate with a sack. Sack fibers act as reinforcing bitumen

and stabilize the bitumen in place. Products such as bitumen cardboard

or bitumen felt also have a similar application to bitumen.

As we explained, being aware of the specifications and details of a product

will significantly help us to get the work done properly. As you have read,

applying the appropriate bitumen grade in the constructions will avoid

future cracks and malfunctioning in the project.