Bitumen 30/40 is a penetration grade bitumen, where 30/40 means that under the standard test (at 25 °C, 100 g, 5 s) a needle penetrates 30–40 deci millimetres (dmm).
Its typical properties: softening point around 55–63 °C, specific gravity ≈ 1.01–1.06 (at 25 °C), ductility at 25 °C ≥ 100 cm, loss on heating ≤ 0.2 wt%, solubility in CS₂ ≥ 99.5%, flash point ≥ 250 °C.
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Bitumen 30/40 is a penetration grade bitumen commonly used in road construction. The numbers 30/40 indicate the penetration value of the bitumen:
30 = minimum penetration
40 = maximum penetration
Measured in 0.1 mm at 25°C.
Harder grade compared to 40/50 or 60/70.
High viscosity, offering greater resistance to deformation.
Suitable for hot climates where pavement must withstand high temperatures.
Heavy-duty road construction
High-traffic highways
Asphalt pavements requiring high stiffness
Durable wearing courses
| Property | Typical Range |
|---|---|
| Penetration (25°C, 100g, 5s) | 30–40 (0.1 mm) |
| Softening Point | ~52–60°C |
| Ductility at 25°C | >100 cm |
| Flash Point | >232°C |
| Solubility in Trichloroethylene | >99% |
High durability
Better rutting resistance
Suitable for hot climates and heavy traffic loads
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