Bitumen refers to a both naturally occurring as well as by vacuum distillation of crude oil obtained mixture of various organic substances. The material behavior is dependent on the ambient temperature and is referred to as elasto-viscous. Bitumen is sticky, sealing, non-volatile, and in non-polar solvents such.
In road bitumen used as binder forms together with the aggregates of the asphalt .
Various flammable mixtures of relatively nonvolatile hydrocarbons that occur naturally or are obtained by fractional distillation of petroleum. Bitumens are used for paving, roofing, sealing of boats to coat buildings and waterproofing. Also called asphalt.
Penetration Grade Bitumen is a standard bitumen usually used as a Paving Grade Bitumen essential for road construction and are specified by the penetration and softening point test.
Some of the penetration grades are 40-50, 60-70, 85-100 etc.
IMPORTED BITUMEN GRADES ARE :