VG bitumen

Bitumen is graded based on absolute viscosity at 60 ºC or kinematic viscosity at  135 ºC. The SI physical unit of dynamic viscosity is Poise and kinematic viscosity is expressed in Centi Stokes. Pure bitumen has been graded based on AASHTO-M226 and ASTM-D3381 standards. Tables 1-1 to 1-6 indicate tests and criteria.