Oxidized Bitumen 115/15, also known as Blown Bitumen 115/15, Blown Asphalt 115/15, or Oxidized Asphalt 115/15, is a high-performance industrial grade material designed for applications requiring exceptional hardness and thermal stability. It is manufactured through controlled air-blowing of penetration-grade bitumen, which modifies its physical structure and improves resistance against heat, aging, and deformation under load.
This grade is widely used in heavy-duty industrial environments where long-term stability and performance consistency are essential.
Blown Asphalt 115/15 is produced by introducing air into hot penetration-grade bitumen under controlled temperature conditions. This oxidation process alters the molecular composition, resulting in a material with significantly increased softening point and reduced penetration value.
The final product is a rigid, durable, and waterproof bituminous material (also known as Oxidized Bitumen or Blown Bitumen), commonly used in protective coatings, sealing systems, and industrial-grade insulation applications where resistance to environmental stress is critical.
Due to its hardness and heat resistance, Bitumen 115/15 is used in joints between bridge decks, viaducts, and heavy-load concrete platforms. It resists thermal movement and mechanical stress without deformation.
Blown Asphalt 115/15 provides excellent corrosion resistance for oil, gas, and chemical pipelines, especially those buried underground or laid in marine environments. Its impermeable nature ensures long-lasting protection.
It serves as a superior lining material for tanks and containment vessels that store aggressive chemicals, due to its resistance to acidic and alkaline compounds.
Bitumen 115/15 is a component in flat and industrial roofs where temperatures can reach extreme levels. It remains stable and non-melting, serving as a long-term protective layer.
Oxidized Asphalt 115/15 dielectric properties and rigidity make it suitable for cable joint insulation in high-voltage electrical systems, offering thermal and chemical shielding.
It forms a dense, water-resistant barrier on concrete surfaces in tunnels, basements, and dams. The rigid layer prevents water ingress and chemical penetration.
✅ Maximum Rigidity & Dimensional Stability
✅ High Softening Point for Thermal Applications
✅ Excellent Resistance to Chemicals & Weather
✅ Long-Lasting Performance in Harsh Conditions
✅ Compatible with Industrial Formulations
Oxidized Bitumen 115/15 (Blown Asphalt 115/15 / Oxidized Asphalt 115/15 / Blown Bitumen 115/15) should be selected when project conditions require maximum thermal stability and structural rigidity rather than flexibility.
It is specifically engineered for:
– continuous high-temperature exposure
– static load-bearing waterproofing systems
– long-term dimensional stability under zero deformation tolerance
Compared to lower softening point grades, 115/15 provides superior resistance to flow and thermal creep, making it unsuitable for flexible systems but ideal for rigid industrial applications.
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Due to its highly oxidized molecular structure, this grade exhibits:
– very low penetration
– minimal elongation capacity
– near-zero ductility behavior
These characteristics classify it as a rigid thermoplastic material rather than an elastomeric system.
Therefore, Blown Bitumen 115/15 is technically unsuitable for:
– expansion joints
– vibration-exposed surfaces
– structural movement zones
It is optimized exclusively for static, fixed, and non-deforming applications.
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The controlled air-blowing process introduces oxygen into hot penetration-grade bitumen, triggering oxidation reactions that increase molecular association and asphaltene structuring.
This results in:
– higher softening point (thermal resistance increase)
– lower penetration (hardness increase)
– improved aging resistance (oxidative stability)
These transformations make Oxidized Bitumen 115/15 suitable for long-life industrial protection systems exposed to heat, oxygen, and environmental stress.
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While Blown Asphalt 115/15 offers high hardness and thermal resistance, its engineering limitations include:
– low ductility (no flexibility under stress)
– limited crack-bridging ability
– non-elastic behavior under load
For this reason, it should not be used where structural movement, dynamic loading, or thermal expansion is expected.
Proper material selection must consider system rigidity as a primary design condition.
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This grade is typically specified in heavy-duty industrial and infrastructure systems such as:
– pipeline coating and corrosion protection systems
– industrial waterproofing membranes
– thermal insulation layers in petrochemical facilities
– electrical and mechanical isolation barriers
– chemical containment and protective lining systems
Its selection is driven by performance requirements rather than cost optimization.
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For industrial logistics and export operations, Blown Bitumen 115/15 is supplied in standardized formats:
– 25 kg heat-meltable polyethylene bags
– 180 kg steel drums (new, export-grade)
– 1 metric ton jumbo blocks for bulk handling
– customized packaging for project-based supply contracts
Packaging selection depends on melting system, handling equipment, and project scale.
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Oxidized Asphalt 115/15 typically has a high flash point (above 250°C), allowing safe industrial heating under controlled conditions.
However, proper application requires:
– strict temperature monitoring during heating
– controlled ventilation systems
– avoidance of overheating beyond recommended processing range
– standard PPE compliance for hot bitumen handling
Improper thermal control may lead to material degradation and fume generation.
Oxidized Bitumen 115/15 is engineered for the most demanding industrial environments where rigidity, chemical resistance, and high-temperature performance are crucial. Its extremely high softening point and low penetration make it ideal for static structures, expansion joints, electrical insulations, and chemical tank linings.
Whether you’re protecting pipelines, coating concrete, or constructing chemical-resistant barriers, Bitumen 115/15 offers exceptional performance and durability. For professionals seeking long-lasting, industrial-grade material, this bitumen grade is a proven solution.
📦 Available in Drums, Jumbo Blocks, and Meltable Bags
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What is Penetration Bitumen? (Part 2)