What is Oxidized Bitumen 85/25
Oxidized Bitumen 85/25 is widely used in waterproofing and coating applications, especially in regions with extremely hot climates, due to its high softening point of approximately 150°C. It is manufactured by blowing hot air through penetration-grade bitumen 60/70, a process that results in a harder, more brittle, and semi-solid material.
This grade of bitumen, classified under petroleum-based hydrocarbons, is specifically formulated for industrial and construction uses where enhanced heat resistance, durability, and rigidity are required. The product offers significant advantages over penetration and viscosity-grade bitumen, including greater thermal stability and reduced sensitivity to temperature fluctuations.
Quality assurance is strictly maintained throughout production, with batch testing conducted under the supervision of quality control teams. Final inspection for quality and quantity is arranged by international surveyors during the loading process. Our Oxidized Bitumen 85/25 is guaranteed to meet ASTM standards, ensuring reliable performance in demanding environments.
How is it produced?
The production process of oxidized bitumen 85/25 is similar to other grades of oxidized bitumen. It involves heating bitumen to a specific temperature, typically around 250-300°C, and then blowing air through it. This process causes oxidation reactions to occur, resulting in a material with increased viscosity, improved aging resistance, and enhanced adhesive properties.
The specific blowing time and air flow rate are carefully controlled to achieve the desired properties of oxidized bitumen 85/25. Once the desired level of oxidation is reached, the material is cooled and solidified into the desired form.
Uses of oxidized bitumen 85/25
Oxidized Bitumen 85/25 is a solid, thermoplastic bitumen of very good adhesion strength, water resistance و insulating properties. It must be heated to around 230°C, roughly two times its softening point, to reach the necessary viscosity and flow for industrial application.
This grade has widespread use in roofing systems as a significant part of waterproof membranes and insulation sheets, imparting long-term resistance to water and temperature extremes. In road construction, it is used as a good binder and crack sealant, especially in areas experiencing moderate thermal variations.
Additionally, Bitumen 85/25 finds successful applications in hydraulic engineering, such as the sealing of canals, reservoirs, and tunnels, with a high degree of resistance against the penetration of water. Pipe coating is another area of its application to make metal surfaces resistant to corrosion and environmental influences.
It is a significant raw material in the production of protective coatings, rubber and plastic goods, and asphalt-based industrial goods. It is also useful in chemical processing, textile treatment, and dust control on unpaved roads and industrial surfaces.
Due to its balance between flexibility and hardness, Oxidized Bitumen 85/25 is a versatile option for civil, infrastructural, and industrial applications, ensuring durability, resistance, and performance under challenging environmental conditions.
Oxidized Bitumen 85/25 vs 85/35
Oxidized Bitumen 85/25 and 85/35 both have a softening point around 85°C but differ in hardness and flexibility. The 85/25 grade has lower penetration (about 20–25 dmm), making it harder and more brittle, ideal for applications requiring high thermal resistance and durability in hot climates, such as heavy-duty waterproofing and industrial coatings.
Meanwhile, 85/35 has higher penetration (around 30–35 dmm), providing greater flexibility and moderate hardness, making it suitable for general waterproofing and construction projects in moderate to warm climates. The choice between these two depends on the balance needed between stiffness and flexibility based on the project’s environmental conditions and mechanical requirements.
Related Post
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Oxidized Bitumen 85/35, or blown asphalt, is a semi-solid bitumen obtained from petroleum that is obtained by air-blowing bitumen 60/70 under regulated high temperatures. This increases its softening point and minimizes temperature sensitivity, and it is perfect for applications in construction that require it to be tough and withstand weather fluctuations. |
Storage and Handling of Oxidized Bitumen 85/25
Oxidized Bitumen 85/25 can retain its properties for up to 10 years when stored properly. It should be kept under shelter, away from sunlight, rain, and moisture, in a dry and ventilated area. Use original packaging (drums, blocks, or bags) and avoid stacking excessively.
For handling, apply indirect heating methods like oil-jacketed kettles and avoid sudden or direct heat to prevent fume release. Do not reheat from a cold state abruptly. Always wear PPE, including gloves, goggles, and protective clothing. Ensure good ventilation in work areas to avoid vapor accumulation.
Health & Safety of Bitumen 85/25
Oxidized bitumen 75/25 should be handled and stored with proper safety precautions to maintain its quality and ensure workplace safety. It should be kept in dry, well-ventilated storage areas away from direct sunlight, open flames, and sources of ignition. The material is typically supplied in solid blocks or drums and should be heated gradually in a controlled environment to avoid overheating, which can lead to degradation or hazardous fumes. Proper personal protective equipment (PPE), including gloves and goggles, should be used during handling to prevent burns or skin contact. Additionally, storage containers should be sealed properly to prevent contamination and maintain the desired properties of the bitumen.
also Workers should wear protective masks, gloves, and goggles during application. please make reference to the relevant MSDS.
Packing of Oxidized Bitumen 85/25
Blown Asphalt 85/25 in various packing, including bitumen 85/25 is available in 20 & 50 Kg Kraft Paper Bags 25 Kg Carton box & 150, 180, 200 Kg Steel Drums:
The most expensive is the 25kg mold packing. This one comes with a removable carton mold that makes shipping rather simple and can be removed with much ease at the destination. The 25kg polyamide bag, being heat-resistant, can cool fast by submerging it directly into water.
However, it is a single-use solution because the polyamide cannot be separated from the bitumen once filled. The 25kg craft bag, on the other hand, is a recyclable packaging solution that has a special inner coating that prevents the bitumen from sticking to the bag. This kind of packaging can be both loaded on pallets or without pallets, depending on the customer’s preference.
Specification
| Oxidized Bitumen 85/25 | Specification | Test method ASTM/EN13304 |
|---|---|---|
| Specific gravity @ 25/25 cg | 1.01/1.06 | D-70 |
| Penetration @ 25 c | 20/30 | D-5 |
| Softening point c | 80/90 | D-36 |
| Loss on heating(wt) % | 0.2 Max | D-6 |
| Flash point c | 250 min | D-92 |
| Solubility is CS2(wt) % | 99.5 Max | D-4 |
| Spot test | negative | ____________________ |
Why Choose Oxidized Bitumen 85/25?
Oxidized Bitumen 85/25 is an adaptable bitumen product applied in waterproofing, insulation, as well as road maintenance. With a softening point of around 85°C, it exhibits higher flexibility and adhesion. Because of its suitable temperature resistance, extended shelf life, and environmentally friendly production process, it is a cost-effective and quality industrial and building solution.
FAQs
What are the benefits of utilizing Oxidized Asphalt 85/25?
It has better adhesion, water resistance, and heat stability compared to other materials, and is therefore an ideal choice for building construction requiring durable, high-quality material.
What precautions must be taken when working with Oxidized Bitumen 85/25?
Good personal protective equipment (PPE) such as gloves, goggles, and masks should be utilized in order to prevent contact with the substance and inhalation of fumes. Also, ensure good ventilation in the working area.
Can Oxidized Bitumen 85/25 be used in cold climates?
Oxidized Bitumen 85/35 can be used in moderate to temperate climates. The product viscosity may increase in very cold temperatures, thereby being less effective in cold climates.
Is Oxidized Bitumen 85/35 environmentally friendly?
Oxidized Bitumen 85/35 is fairly safe if properly handled. Nevertheless, proper disposal and compliance with environmental laws are required to prevent contamination and minimize the effect on the environment.
How long is the shelf life of Blown Bitumen 85/25?
Under ideal conditions and proper storage, Blown Bitumen 85/25 can last up to 10 years from date of manufacture without experiencing significant deterioration.
