FAQ: What is Oxidized Bitumen 75/35?

❓ What is Oxidized Bitumen 75/35?

🧪 Blown Asphalt 75/35 is a semi-solid, air-blown bitumen with a softening point of 75°C and a penetration value of 35 (in 1/10 mm). Manufacturers produce it by blowing air through penetration-grade bitumen. This process enhances its heat resistance, aging stability, and elasticity. It is mainly used in industries that require strong, heat-tolerant waterproofing materials.

❓ Where is Oxidized Bitumen 75/35 used?

🏗️ Blown Asphalt 75/35 commonly used in roofing, pipe coating, sound dampening, and joint sealing. Because of its durability and flexibility, it performs well in areas with frequent temperature changes. Engineers prefer it for projects that demand long-term protection against water and heat.

❓ What makes 75/35 different from other grades?

🔍 Its penetration value of 35 makes it slightly softer than 75/25 or 75/30. As a result, it offers more flexibility without compromising thermal stability. This balance makes 75/35 suitable for both static and dynamic applications, where the material must adapt to surface movement.

❓ Can 75/35 perform in high temperatures?

🌡️ Yes, Blown Asphalt 75/35 performs reliably in hot environments. Its high softening point prevents melting or flow under heat. For this reason, it remains stable on surfaces exposed to sunlight, machinery heat, or high-pressure sealing. It maintains shape and strength even during intense summer conditions.

❓ How do engineers check the quality of Oxidized Bitumen 75/35?

📊 Engineers test its softening point, penetration, ductility, and viscosity using international standards like ASTM or EN. These tests confirm the bitumen’s ability to resist deformation and aging. Quality testing ensures that the material performs consistently across various industrial uses.