FAQ: What is Oxidized Bitumen 85/25?

What is Oxidized Bitumen 85/25?

Blown Asphalt 85/25 is a hard, air-blown grade of bitumen. The “85” stands for its softening point of 85°C, and “25” represents its penetration value (25 in 1/10 mm). This material is heat-resistant, water-repellent, and highly durable. Industrial users value it for heavy-duty applications that require strength, stability, and long service life.

Where is Oxidized Bitumen 85/25 used?

Blown Asphalt 85/25 commonly used in roofing sheets, pipe coatings, foundry sand binders, electrical cable coatings, and chemical-resistant flooring. Since it offers strong thermal performance, engineers apply it in areas exposed to heat and heavy pressure. It’s also effective in preventing corrosion and water penetration.

How is 85/25 different from softer bitumen grades?

Blown Asphalt 85/25 is stiffer and more heat-resistant than softer grades like 75/30. It does not soften easily, even in high-temperature environments. While softer grades allow flexibility, 85/25 provides structural firmness, which makes it better for static installations and load-bearing surfaces.

Can Blown Asphalt 85/25 withstand extreme heat and stress?

Yes, this bitumen grade performs very well under extreme heat. Its high softening point prevents melting or deformation. As a result, it remains solid even under direct sunlight or industrial temperatures. This makes it a strong option for projects that face harsh environmental conditions.

How do engineers check the quality of Oxidized Bitumen 85/25?

Quality control includes testing for softening point, penetration, specific gravity, and ductility. These tests ensure that the product meets required industrial standards. Most manufacturers follow ASTM or EN protocols to deliver consistent and dependable results in every batch.

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