Bitumen Grade AH70 — Temperature-Stable Asphalt Binder for Highway Pavements

Bitumen Grade AH70 is a penetration-grade bitumen derived from crude oil, with a penetration value of 60–80 (0.1mm) at 25°C. It is a mid-hard grade under the Chinese penetration-grade classification, commonly used for standard highway pavements.

 AH70 has a specific gravity of 1.01–1.06 at 25°C, softening point of 46°C minimum, ductility of 100cm minimum at 25°C, flash point of 230°C minimum, and solubility in trichloroethylene of 99% minimum, per ASTM test methods (D70, D5, D36, D113, D92, D2042).

 AH70 bitumen has a penetration range of 60–80 (in 0.1mm units) measured at 25°C under 100g load for 5 seconds, tested per ASTM D5, placing it between the harder AH50 and softer AH90/AH110/AH130 grades.

AH70 is commonly used for standard highway pavements, general road construction, and hot mix asphalt (HMA) production, offering balanced viscosity and temperature stability for everyday paving projects.

AH70 is suitable for medium to moderately heavy traffic conditions. For very heavy traffic or extreme heat, harder grades such as AH50 are typically preferred.

Yes, AH70 is widely used in hot mix asphalt (HMA) production at asphalt mixing plants due to its good workability and balanced durability.

AH70 sits in the mid-range of the AH series, harder and stiffer than AH90, AH110, and AH130, but softer and more flexible than AH50, making it a versatile choice for general highway pavements.