Oxidized Bitumen: Complete Guide, Grades, Applications, and Differences from Other Bitumen Types

What Is Oxidized Bitumen?

Oxidized Bitumen, also known as Blown Bitumen or Air-Blown Bitumen, is a specially processed petroleum bitumen produced by passing hot air through penetration grade bitumen under controlled temperatures. This oxidation process changes the molecular structure of the bitumen, resulting in a product with higher softening point, improved temperature resistance, enhanced durability, and lower penetration values.

Unlike conventional paving bitumen used in road construction, oxidized bitumen is primarily designed for industrial, construction, waterproofing, insulation, and protective coating applications.

Today, oxidized bitumen is widely used in roofing membranes, waterproofing systems, pipe coatings, industrial flooring, mastics, sealants, and corrosion protection solutions worldwide.

How Oxidized Bitumen Is Produced

The production process begins with high-quality penetration grade bitumen.

During manufacturing:

1. Bitumen is heated to high temperatures.
2. Air is blown through the material under controlled conditions.
3. Oxidation modifies the hydrocarbon structure.
4. The bitumen becomes harder and more temperature resistant.
5. Desired penetration and softening point specifications are achieved.

The result is a highly stable product capable of performing under demanding environmental conditions.

Oxidized Bitumen vs Other Bitumen Types

Understanding the differences between oxidized bitumen and other bitumen grades is essential for selecting the right material.

Oxidized Bitumen vs Penetration Grade Bitumen

Penetration grade bitumen such as 60/70 and 80/100 is primarily used for road paving and asphalt production.

Penetration bitumen is flexible and suitable for roads, while oxidized bitumen is preferred for industrial and waterproofing applications.

Oxidized Bitumen vs Bitumen Emulsion

Bitumen emulsion consists of bitumen dispersed in water using emulsifying agents.

Emulsions are mainly used in road maintenance, while oxidized bitumen serves industrial and waterproofing sectors.

Oxidized Bitumen vs Cutback Bitumen

Cutback bitumen contains petroleum solvents that reduce viscosity.

Oxidized bitumen offers superior durability and environmental performance compared to cutback grades.

Understanding Oxidized Bitumen Grades

Oxidized bitumen grades are typically identified by two numbers, such as 85/25, 90/15, or 115/15.

The first number indicates the approximate Softening Point (°C).

The second number indicates the approximate Penetration Value (dmm).

For example:

Oxidized Bitumen 85/25

• Softening Point: Approximately 85°C
• Penetration: Approximately 25 dmm
• Excellent flexibility and waterproofing performance

Oxidized Bitumen 90/15

• Softening Point: Approximately 90°C
• Penetration: Approximately 15 dmm
• Higher hardness and thermal stability

Oxidized Bitumen 115/15

• Softening Point: Approximately 115°C
• Penetration: Approximately 15 dmm
• Suitable for demanding industrial applications

Oxidized Bitumen 150/5

• Softening Point: Approximately 150°C
• Penetration: Approximately 5 dmm
• Extremely hard grade for specialized industrial uses

Most Popular Oxidized Bitumen Grades

Oxidized Bitumen 75/25

Used in:

• Waterproofing compounds
• Roofing products
• Industrial mastics

Oxidized Bitumen 85/25

Used in:

• Roofing membranes
• Waterproofing systems
• Construction sealants
• Protective coatings

Oxidized Bitumen 90/15

Used in:

• Pipe coating
• Corrosion protection
• Waterproofing membranes

Oxidized Bitumen 95/25

Used in:

• Industrial flooring
• Roof insulation
• Adhesive manufacturing

Oxidized Bitumen 105/15

Used in:

• High-temperature environments
• Pipe wrapping
• Industrial coating systems

Oxidized Bitumen 115/15

Used in:

• Heavy-duty waterproofing
• Cable compounds
• Industrial insulation

Oxidized Bitumen 150/5

Used in:

• Specialized industrial manufacturing
• Heat-resistant products
• Advanced protective coatings

Advantages of Oxidized Bitumen

Oxidized bitumen offers numerous benefits:

Excellent Waterproofing Properties

Provides long-lasting protection against moisture penetration.

High Softening Point

Maintains stability at elevated temperatures.

Superior Chemical Resistance

Resists many chemicals and industrial contaminants.

Outstanding Adhesion

Bonds effectively to concrete, metal, wood, and other substrates.

Long Service Life

Offers excellent durability under harsh environmental conditions.

Corrosion Protection

Provides reliable protection for steel structures and pipelines.

Main Applications of Oxidized Bitumen

Oxidized bitumen is widely used across multiple industries.

Roofing Membranes

One of the largest applications worldwide.

Waterproofing Systems

Used in:

• Foundations
• Basements
• Roof decks
• Bridges
• Tunnels

Pipe Coating

Protects pipelines against corrosion and environmental damage.

Industrial Flooring

Provides durable and resistant protective layers.

Adhesives and Sealants

Used in high-performance construction materials.

Electrical Industry

Applied in cable filling compounds and insulation systems.