Oxidized Grade Bitumen
Oxidized Grade Bitumen, also known as Blown Asphalt, is a specially engineered bitumen produced through controlled air-blowing processes. By introducing heated air into penetration grade bitumen, its physical and chemical properties are transformed, creating a material with higher softening points, improved temperature resistance, enhanced durability, and superior performance in demanding industrial environments.
Widely used across construction, waterproofing, roofing, insulation, and industrial manufacturing sectors, oxidized bitumen delivers long-term reliability where conventional bitumen may not meet performance requirements.
Production Process
Oxidized Grade Bitumen is manufactured through Continuous or Staggered Air-Blowing Processes. During production, heated penetration grade bitumen is exposed to controlled streams of air at elevated temperatures. This oxidation process reduces oil content and alters the molecular structure of the bitumen, resulting in improved hardness, elasticity, viscosity, and thermal stability.
Finished grades are designated using two numerical values that indicate their softening point and penetration characteristics, allowing users to select the most suitable grade for specific applications.
Key Characteristics
Higher Softening Point
Excellent resistance to heat and deformation under elevated temperatures.
Improved Durability
Enhanced structural stability and long-term performance in demanding environments.
Waterproofing Performance
Provides reliable moisture protection for roofing and waterproofing systems.
Strong Adhesion
Excellent bonding properties for coatings, membranes, and industrial applications.
Types and Grades
Oxidized Bitumen is available in multiple grades designed to meet specific industrial requirements. Common grades include 85/25, 90/15, 95/25, 105/15, and 115/15, each offering distinct penetration and softening point characteristics.
| Grade | Softening Point | Penetration Range | Typical Applications |
|---|---|---|---|
| 85/25 | Approx. 85°C | 25 dmm | Roofing, waterproofing |
| 95/25 | Approx. 95°C | 25 dmm | Industrial insulation, coatings |
| 105/15 | Approx. 105°C | 15 dmm | Pipe coatings, sealants |
| 115/15 | Approx. 115°C | 15 dmm | High-temperature industrial use |
Applications
The versatility of Oxidized Grade Bitumen makes it suitable for a wide range of industrial and construction applications worldwide.
Roofing Systems
Used in roofing membranes, waterproofing sheets, and protective layers.
Waterproofing
Provides long-lasting moisture barriers for buildings and infrastructure.
Pipe Coatings
Protects pipelines against corrosion and environmental exposure.
Joint Sealants
Ideal for sealing joints, cracks, and construction gaps.
Industrial Coatings
Used in paints, protective coatings, and specialized industrial products.
Automotive Applications
Used in underbody coatings and sound-dampening materials.
Advantages Over Conventional Bitumen
- Higher thermal stability and heat resistance.
- Reduced temperature susceptibility.
- Improved durability and service life.
- Superior waterproofing performance.
- Excellent adhesion and sealing capabilities.
- Suitable for demanding industrial environments.
Compared to paving grade bitumen, oxidized grades maintain greater structural integrity under varying temperatures and provide enhanced performance in applications requiring long-term durability.
Application Guidelines
For optimal performance, oxidized bitumen should be heated gradually and uniformly before application. Typical working temperatures range between 220°C and 230°C depending on the selected grade and project requirements.
Proper temperature control ensures ideal viscosity, workability, and adhesion while minimizing degradation during installation.
Conclusion
Oxidized Grade Bitumen represents a highly specialized and versatile material that continues to play a vital role in modern construction and industrial applications. Through advanced air-blowing technology, it delivers enhanced thermal stability, durability, waterproofing performance, and resistance to demanding operating conditions.
From roofing systems and pipe coatings to industrial insulation and waterproofing solutions, oxidized bitumen remains a trusted choice for projects requiring long-lasting protection and reliable performance.