Shimi Tejarat Naghshe Jahan Co.

Which bitumen grade is right for you?

These bitumen grades are produced in our company:

Penetration Grade

Penetration grade bitumen is a classification system used to specify the hardness or consistency of bitumen based on its penetration value. The Long-Term Pavement Performance (LTPP) has given a certain algorithm to calculate the temperature of the pavement based on the temperature of the air above. This classification helps in determining the suitability of bitumen for various applications, particularly in road construction and pavement design. Higher penetration values indicate softer bitumen, while lower penetration values indicate harder bitumen.
Most Market Grades

Performance Grade (PG)

Performance Grade Bitumen is bitumen which is graded based on its performance at different temperatures. The LTPP has given the certain algorithm to calculate the temperature of the pavement based on the temperature of the air above. From this, the highest and the lowest temperatures of the pavement is calculated and the bitumen that performs well in that temperature range is selected. The higher the grade, the stiffer the bitumen. Most high performing roads in Australia are built and maintained using bitumen because it is durable and has exceptional waterproofing and adhesive properties. Bitumen used in road construction and maintenance are refined and blended to meet strict road engineering requirements and industry specifications.
Most Market Grades

Viscosity Grade (VG)

Viscosity Grade Bitumen is a standard grade Bitumen, manufactured from a fractional / vacuum distillation of crude oil, which practical appliance and behavior varies according to its temperature. This grade of bitumen is mainly used in the manufacture of hot mix asphalt suitable for road construction, the production of asphalt pavements, roofing, and industrial processes with superior properties. This type of bitumen has a thermoplastic property which causes the material to soften at high temperatures and to harden at lower temperatures. In this type of bitumen, a higher number indicates that the bitumen is harder.
Most Market Grades

Asphalt Cement Grade (AC)

Asphalt cement grade of bitumen is one of the main categories of viscosity grade bitumen in which the viscosity of the standard bitumen is measured at 60 ºC (140 ºF) in units of 100 poises. AC grading specifies asphalt binder properties prior to the hot mix asphalt (HMA) production process. Hence, it should provide a more accurate representation of how asphalt binder behaves within HMA pavements.
Most Market Grades