Paving Class Grades of Bitumen
Paving grade bitumens are categorized according to viscosity (degree of fluidity) gradings. The higher the grade, the stiffer the bitumen.
Bitumen Class 170
Class 170 is widely used in sprayed sealing and light asphalt applications to provide durability and fatigue resistance. It is also used to manufacture cutback bitumens, bitumen emulsions and modified bitumens.
Bitumen Class 320
Class 320 is most commonly used to manufacture asphalt mixes. Due to its higher viscosity, stiffer asphalt mixes can be produced to improve resistance to shoving and other problems associated with higher temperature and traffic loads.
Bitumen Class 600
Class 600 is primarily used to manufacture extra heavy-duty asphalt pavements that need to endure substantial traffic loadings.
The table below shows typical applications for paving grade bitumens: