Australian Standard C240 bitumen is a hard paving grade with high viscosity and durability, ideal for heavy traffic roads and demanding infrastructure applications.
What Is Bitumen C240
Under AS 2008:1997, C240 is a Class 240 bitumen with a dynamic viscosity at 60°C of 200–300 Pa·s and a kinematic viscosity targeting 240 mm²/s. This places it between the soft C170 (100–200 Pa·s) and the stiffer C320 (280–380 Pa·s), making it ideally suited for the broadest range of Australian road conditions. C240 is broadly equivalent to 80/100 to 100/150 penetration grade bitumen in terms of hardness at 25°C. In the AASHTO system, it corresponds approximately to AC-10. However, the AS 2008 viscosity-based classification provides a more technically rigorous performance guarantee at actual pavement service temperatures, which is why Austroads mandates it for all Australian national highway projects rather than relying on penetration grading. C240 is also the standard base binder grade for many polymer-modified bitumen (PMB) grades used on premium Australian highways, including A10E and A20E modified binders for high-traffic wearing courses.



