Paving Grade Bitumen
Paving grade bitumen goes by the name of VG10,VG30,VG40 are produced by Refineries. Sometimes due to unavailability of desired VG grade, one requires to bump the grade. Brij chemicals is
equipped to grade bump to your required specs. If required, the regular VG grade can be custom modified in few parameters to make it even more stronger VG grade.
Bitumen is a thermoplastic material and its stiffness is dependent on temperature. The temperature-vs-stiffness relationship of bitumen is dependent on the source of crude oil and the method
of refining. The Bureau of Indian Standards (BIS) introduced paving grade bitumen specifications (IS: 73- 1950) for the first time in the year 1950 and then revised it in 1992 to improve
the quality of Bitumen. As per these specifications, there are four grades VG-10, VG-20, VG-30 & VG-40.
According to viscosity (degree of fluidity) grading, higher the grade, stiffer the Bitumen. Tests are conducted at 60℃ and 135℃ , which represent the temperature of road surface
during summer (hot climate, similar to northern parts of India) and mixing temperature respectively. The penetration at 25℃ , which is annual average pavement temperature, is also