Viscosity Grade Bitumen (asphalt) is known to be a suitable paving grade bitumen suitable for road construction and for the production of pavement asphalts with controlled properties.

This grades of Bitumen is mainly used in the manufacturing of hot mix asphalt and course wearing. They can build a set of flexible and tenacious connections with other materials (such as aggregations) mainly due to viscoelastic response of bitumen, such behavior mostly is a variant based on how fast charges are applied. Viscosity Grade Bitumen produced by BS GROUP is petroleum grade bitumen, manufactured from  vacuum distillation of crude oil (VB) which practical appliance and behavior vary according to its temperature. Viscosity Grade bitumen are specified by the methods described in ASTM Standard as AASHTO M226-80 and D3381–09 (2008). Viscosity Graded properties are mostly indicated at 60 C (140 °F).

Tests are conducted at 60 C and 135 C, which represent the temperature of road surface during summer (hot climate, similar to northern parts of India) and mixing temperature respectively. The higher the grade gets, the stiffer the bitumen becomes. While the penetration grading conducts the tests at 25 C, which is the average pavement temperature annually.