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. Bitumen penetration grade 85-100 is semi hard penetration grade bitumen used as paving grade bitumen. It is suitable for road construction and repair. It is also used for the production of asphalt pavements. Below you will find its technical specification. This grade of bitumen is mainly used in the manufacturing of hot mix asphalt for bases and wearing courses.