MC 70 Cutback Bitumen
MC70 Cutback Bitumen is a medium-curing asphalt product specially designed for road construction and maintenance applications. It is manufactured by blending bitumen with a volatile solvent to reduce its viscosity, allowing easier handling, pumping, and uniform application at lower temperatures. Compared to rapid-curing variants, MC70 provides a moderate rate of solvent evaporation, ensuring proper penetration and adhesion to the surface while minimizing cracking and shrinkage during the curing process. Its balanced viscosity and distillation properties make it suitable for both prime coating and tack coat operations on new or rehabilitated pavements.
This type of bitumen exhibits excellent workability, water resistance, and durability, making it ideal for various asphalt mixtures and surface treatments. The specifications, such as kinematic viscosity, flash point, penetration, and ductility, are carefully controlled to meet international standards, ensuring consistent performance under different environmental conditions. MC70’s predictable curing behavior provides contractors with flexibility in application, allowing efficient paving operations even in moderate ambient temperatures, while delivering long-lasting, high-quality road surfaces.
| Cutback Bitumen Medium-Curing-70 Specifications | ||||
|---|---|---|---|---|
| Properties | Specification Limit | Test Method | ||
| Min | Max | |||
| Kinematic Viscosity at 60 °C, mm2/s | 70 | 140 | ASTM D2170 | |
| Flash Point (Tag Open Cup), °C | 38 | – | ASTM D3143 | |
| Distillate, %Volume of Total Distillate to @360 °C | ||||
| To 225 °C | – | 25 | ASTM D402 | |
| To 260 °C | 10 | 70 | ASTM D402 | |
| To 316 °C | 75 | 93 | ASTM D402 | |
| Residue From Distillation to 360 °C (% Vol by Difference) | 55 | – | ASTM D402 | |
| Test On Residue from Distillation: | ||||
| Penetration, 25 °C, (dmm) | 120 | 300 | ASTM D5 | |
| Ductility, 25 °C, (cm) | 100 | – | ASTM D113 | |
| Solubility in Trichloroethylene, % | 99 | – | ASTM D2042 | |
| Water , % | – | 0.2 | ASTM D95 | |
