FAQ: What is Oxidized Bitumen 85/40?

❓ What is Oxidized Bitumen 85/40?

🧪 Blown Asphalt 85/40 is a hard, semi-solid form of bitumen. Manufacturers produce it by blowing air through penetration-grade bitumen, raising its softening point to 85°C and lowering its penetration value to 40. As a result, it delivers excellent thermal resistance and long-term performance in demanding conditions.

❓ Where do industries use Oxidized Bitumen 85/40?

🏗️ This grade works well in roofing, pipe coatings, industrial flooring, and soundproofing systems. Because of its high softening point, it resists deformation under heat. Additionally, it provides excellent adhesion and water resistance, which makes it ideal for long-lasting protective layers.

❓ What makes Blown Asphalt 85/40 different from other oxidized bitumen grades?

🔍 Unlike softer grades, 85/40 offers a stronger structure while still allowing moderate flexibility. Engineers often choose it for static applications that face heat and stress. Moreover, it balances hardness and workability better than harder grades like 85/25.

❓ Can 85/40 handle high-temperature conditions?

🌡️ Yes, Blown Asphalt 85/40 performs well in hot environments. Thanks to its elevated softening point, it maintains shape and strength under sunlight, machinery heat, or thermal cycling. This reliability reduces maintenance and increases the lifespan of the installation.

❓ How do engineers verify the quality of Oxidized Bitumen 85/40?

📊 They use lab tests such as penetration, softening point, ductility, and specific gravity. These tests follow standards like ASTM or EN, ensuring the product meets both technical and environmental demands. Regular testing also helps maintain consistency across batches.