Bitumen Penetration Grade 60/70 is a commonly used grade of bitumen in road construction. The specification of Bitumen Penetration Grade 60/70 typically includes the following parameters:
1. Penetration
The penetration value is between 60 and 70 (1/10 mm) at 25°C using a standard test method. This indicates the hardness of the bitumen. A penetration value of 60/70 means the bitumen is relatively hard, suitable for use in hot climates or high-traffic roads.
2. Viscosity
Viscosity at 60°C typically ranges between 300-500 cP. This property describes the flow characteristics of bitumen at elevated temperatures.
3. Softening Point
The softening point is usually between 47°C and 57°C. This is the temperature at which the bitumen softens and starts to flow, which is crucial for performance under hot weather conditions.
4. Flash Point
The flash point is typically higher than 230°C, which ensures that the bitumen is safe to handle and transport.
5. Solubility
Bitumen 60/70 typically has a solubility in trichloroethylene of 99.0% or higher. This indicates the purity of the bitumen.
6. Ductility
The ductility at 25°C is typically more than 100 cm. This refers to the ability of bitumen to stretch without breaking, indicating its flexibility.
7. Loss on Heating
Loss on heating for bitumen 60/70 is typically not more than 1.0% when heated at 163°C for 5 hours, which indicates stability during high-temperature conditions.
8. Flash Point
The flash point is generally above 230°C, ensuring safety in high-temperature environments.
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