What is Oxidized Bitumen 115/15?

Oxidized Bitumen 115/15 is a semi-solid, highly durable grade of pure petroleum bitumen, produced through an air-blowing process. During this process, hot air is passed through heated bitumen, altering its molecular structure. The result is a product with superior mechanical properties—greater hardness, flexibility, and thermal resistance compared to regular penetration-grade bitumen.

This grade is particularly well-suited for demanding construction applications such as waterproofing, roofing, and insulation, especially in environments with wide temperature variations. Its resistance to cracking and stable performance under extreme heat and cold make it a preferred material in industrial settings.

Approximately 70% of our production capacity is dedicated to Bitumen 115/15, reflecting its high demand and versatility.

To evaluate its heat resistance, the Ring and Ball test is commonly used to determine the softening point. This test ensures that the bitumen maintains its integrity under thermal stress, which is critical for performance in high-temperature applications.

Properties

Softening Point: ~115°C

Penetration: 10-20 dmm

Appearance: Solid black, shiny appearance

Stability: Chemically stable, water-resistant, UV & aging-resistant

Applications

Oxidized Bitumen 115/15 is extensively used in a wide range of industrial and construction applications thanks to its excellent thermal stability, water resistance, and strong adhesive properties. One of its primary uses is in waterproofing systems for roofs, basements, and building foundations, where it prevents moisture penetration and enhances structural longevity. It is also used in the manufacture of roofing membranes, asphalt sheets, and underlayment materials.

In infrastructure and industrial sectors, it serves as a protective coating for pipelines, steel structures, and concrete surfaces, safeguarding them from corrosion and environmental damage. Additionally, it plays a role in asphalt modification, improving road surface durability, and is used in electrical cable insulation due to its non-conductive and heat-resistant properties. Its ability to maintain performance under extreme temperatures makes it a reliable material for projects in both cold and hot climates.

Manufacturing Process

Heating: Penetration-grade bitumen is heated to ~250–300°C

Blowing Air: Controlled air flow changes molecular structure

Result: Bitumen is more elastic, harder, and heat-stable

This procedure ensures conformity with the required softening point, penetration, and resistance to aging.

Softening Point Test (Ring & Ball Method)

The Ring and Ball test is used to check the temperature resistance of Bitumen 115/15. It checks the softening point — a very important factor in assessing performance when subjected to heat stress.

115/15 vs 85/25 – What’s the Difference?

Oxidized Bitumen 115/15 and 85/25 are two common grades used in construction and waterproofing, but they serve different purposes due to their distinct physical properties. The key difference lies in their softening points and penetration values. Bitumen 115/15 has a higher softening point (around 110–115°C) and lower penetration (10–15 dmm), making it much harder, more brittle, and ideal for extremely hot climates or industrial applications requiring high thermal resistance.

On the other hand, Bitumen 85/25 has a lower softening point (about 85–90°C) and higher penetration (20–30 dmm), which gives it more flexibility and moderate hardness, suitable for general waterproofing tasks in warm to hot environments. Both grades are produced by air-blowing base bitumen 60/70, but their selection depends on the specific needs of the project regarding heat resistance and flexibility.

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Packing Options

Kraft Bags

Meltable PE Bags

Drums

Bulk Delivery

Packages are delivered solid and can be heated on-site to melt.

Storage and Handling Instructions

For bitumen product durability and performance, they should be stored in dry, shaded areas without sunlight and rain. Exposure to rain or sunlight for an extended period may affect the physical properties of the material and reduce its efficiency over a period of time.

In the proper storage environment, shelf life of the product may extend up to 10 years.

When handling the material, follow these safety protocols:

Use protective gloves to avoid direct contact with the skin.

Ensure proper ventilation in the region to prevent the inhalation of any fumes or vapors.

Avoid exposure to rain, humidity, or high temperatures, as they can harm the quality and stability of the bitumen.

Specification 

Why Use Bitumen 115/15?

Long-term strength

Heat, humidity & chemical resistance

Stable through temperature fluctuations

Eco-friendly, sustainable production

Cost-effective for major projects

 ZUMRUT INT Co. offers premium-grade bitumen, which is ideal for industrial and construction applications. With excellent durability, weather resistance, and adherence properties, our product ensures top performance in waterproofing, road construction, and roofing. Order now for competitive pricing, fast delivery, and expert support!

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