To grade the bitumen based on viscosity BIS revised IS-73-1992specifications (Viscosity at 60°C) and as such there are four grades VG-10, VG-20, VG-30 & VG-40. A few qualification tests like specificgravity, water content, ductility, loss on heating &Farass breaking point were removed from IS:7...

Bitumen is a mixture of organic liquids that are highly viscous, black, sticky, entirely soluble in carbon disulfide, and composed primarily of highly condensed polycyclic aromatic hydrocarbons.
Naturally occurring or crude bitumen is a sticky, tar-like form of petroleum that is so thick and heavy that it must be heated or diluted before it will flow. At room temperatu