🔍 What is oxidized bitumen?
Oxidized bitumen, also called blown bitumen or blown asphalt, is produced by blowing air through bitumen at high temperatures. This process changes its properties, making it harder, more heat-resistant, and suitable for waterproofing and industrial applications like roofing, pipe coating, and sealants.
🔍 How is oxidized bitumen different from regular bitumen?
Unlike regular bitumen, Blown asphalt has a higher softening point and lower penetration value due to the air-blowing process. It performs better in high temperatures and harsh environments, making it ideal for industrial use and heavy-duty applications.
🔍 What are the physical properties of oxidized bitumen?
Blown asphalt is solid or semi-solid at room temperature. It features high softening point, low penetration, increased stiffness, and strong thermal stability. These properties make it highly durable in conditions involving heat, chemicals, or mechanical stress.
🔍 What is the manufacturing process of oxidized bitumen?
Blown asphalt is manufactured by passing air through hot bitumen (240–320°C). This oxidation process increases molecular weight and viscosity, producing bitumen grades like 85/25, 95/25, or 115/15, each with different softening and penetration values suited to specific uses.
🔍 What are the common applications of oxidized bitumen?
Common uses include roofing membranes, waterproofing, pipe coatings, expansion joints, adhesives, and corrosion-resistant linings. Its resistance to weather, heat, and chemicals makes it indispensable in both construction and industrial sectors.
🔍 Is oxidized bitumen environmentally safe?
Yes, when handled and applied correctly. It is non-soluble in water and has low emissions after application. However, during production and heating, safety measures such as proper ventilation and PPE should be used to avoid exposure to fumes.
