Differences Between Bitumen 115/15 and Bitumen 10/20
The differences between bitumen 115/15 and bitumen 10/20 are essential for engineers, road contractors, and buyers to understand. These two types of bitumen belong to different categories and serve different applications based on their physical properties, softening points, and packaging standards.
1. Category and Usage
Bitumen 115/15 is an oxidized bitumen grade, also known as blown bitumen, and is mainly used in industrial applications such as waterproofing, pipe coating, and insulation. In contrast, bitumen 10/20 is a penetration grade, widely used in heavy traffic roads, bridges, and asphalt pavements due to its higher flexibility and durability.
2. Softening Point Comparison
The softening point of bitumen 10/20 is around 62°C, while GRADE 115/15 reaches approximately 115°C. This makes 115/15 a more heat-resistant but less flexible material, whereas 10/20 remains softer and more elastic under similar conditions. Bitumen 10/20 is ductile and stretches up to 100 cm, whereas bitumen 115/15 typically breaks at 1.5 cm of elongation.
3. Penetration and Ductility
Both grades may have similar penetration values (10–20 dmm), but their ductility and behavior under stress differ significantly. Grade 10/20 maintains high ductility, making it ideal for cold climates and dynamic loads, while 115/15 is stiffer and more brittle due to oxidation.
4. Packaging Types
Bitumen 115/15 is typically packed in 25 kg craft paper bags, plastic meltable bags, or carton boxes. In contrast, bitumen 10/20 is commonly supplied in steel drums, jumbo bags, or bulk packaging. The packaging reflects the difference in physical state, application, and handling requirements.
5. Technical Comparison Table
| Item | Bitumen 10/20 | Bitumen 115/15 |
|---|---|---|
| Softening Point | 62°C | 115°C |
| Penetration | 10–20 dmm | 10–15 dmm |
| Flash Point | Min 250°C | Min 250°C |
| Ductility | 100 cm | 1.5 cm |
| Solubility in CS2 | 99.5% | 99.5% |
| Loss on Heating | Max 0.2% | Max 0.2% |
| Spot Test | Negative | Negative |
| Specific Gravity | 1.01–1.06 | 1.01–1.06 |
| Packing | Drum / Jumbo Bag | 25kg Bag / Box |
Conclusion
While bitumen 10/20 and bitumen 115/15 may appear similar at a glance, they are entirely different in behavior, structure, and applications. Make sure to select the right type based on your project’s temperature range, mechanical stress tolerance, and performance needs.