What viscosity grade bitumen is
Viscosity grade (VG) bitumen is paving bitumen classified by absolute viscosity at 60°C — a performance-based system that predicts how a binder behaves at real pavement temperatures. The four grades VG-10, VG-20, VG-30 and VG-40 give engineers a precise way to match a binder to traffic and climate, and VG-30 broadly corresponds to a 60/70 penetration grade.

