What is Oxidized Bitumen 85/35?
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.
It meets the requirements of ASTM standards D36 (softening point) and D5 (penetration) and is made by either continuous or batch process of blowing. Its unique balance of hardness and flexibility places it particularly in roofing, waterproofing, and insulation use in industrial and civil engineering.
Supported by a seasoned technical and sales force, oxidized bitumen 85/35 is packaged in various packaging options and may be tailored to project requirements.
Applications of Oxidized Bitumen 85/35
Bitumen 85/35 oxidized is a very popular product within many industries due to its top-notch performance compared to mechanical stress and temperature changes. Within the construction sector, it is one of the great materials to employ for waterproofing roofs, insulation, sealing joints, filling cracks, and protective coating.
It is a key component in the formulation of paints, varnishes, lacquers, mastics, rubber, plastic, and asphalt corrosion-resistant coatings. It is further used in synthetic turf underlay, pipe coatings, Portland cement pavement additives, and hydraulic systems. Because it is thermally stable and can adhere, it offers better protection and performance when used in temperate and hot climates.
85/35 vs 85/40: What’s the Difference?
| Property | Oxidized Bitumen 85/35 | Oxidized Bitumen 85/40 |
|---|---|---|
| Penetration @25°C (dmm) | 30 – 40 | 35 – 45 |
| Softening Point (°C) | 80 – 90 | 80 – 90 |
| Ductility @25°C (cm) | 1.5 min | 3 |
| Flash Point (°C) | 250 min | 230 min |
| Solubility in CS₂ (%) | 99.5 min | 99 min |
| Application Focus | Waterproofing, roofing, coatings | Roofing, mastics, insulation |
| Thermal Resistance | Very High | High |
| Preferred Climate | Moderate to Hot | Hot |
Storage and Handling
For best quality and performance, Oxidized Bitumen 85/35 should be stored in dry, covered structures away from sunlight, humidity, and severe changes in temperature. In proper storage conditions, it will last for 10 years.
The bitumen must be handled using insulated equipment and heated gradually not to degrade. Thermal cracking or reduced product integrity may result from overheating. Personal protective equipment such as gloves, goggles, and masks must always be worn when handling and applying it. Kerosene or gasoline may be employed to clean tools upon application.
Health and Safety
Although it is not a very dangerous substance, Oxidized Bitumen 85/35 should still be handled with caution. Work areas must be properly ventilated to prevent inhalation of fumes in case of heating. Handling with eyes and skin should be avoided and proper PPE is to be used at all times.
Proper thermal control is required. The material must not be reheated from a cold state in boilers, as this may lead to the buildup of vapor and overheating. Always monitor closely to avoid exceeding the safe handling temperature of about 230°C.
Packing
Meltable Polyamide Sacks: 25 kg – heat-stable, rapid-cooling through dipping in water, non-transfer after melting.
Kraft Sacks: 20, 25, and 50 kg – recyclable, specialty lining to prevent sticking, pallet-load or without.
Cardboard Boxes: 25 kg – removable design mold, handy handling, upscale option.
Steel Drums: 150, 180, or 200 kg – ideal for massive transit and extended warehousing.
Optional packaging is on request for customer needs.
Why Use Oxidized Bitumen 85/35?
Oxidized Bitumen 85/35 possesses high mechanical strength, heat resistance, and adhesion properties, thus being an ideal product for use in construction and industry. Its softening point is around 85°C and is effective even in fluctuating temperature conditions. It exhibits strong bonding to many surfaces.
Its production is energy-saving and environmentally safer than with most other competing materials. Furthermore, it is long-lasting, cheap, and less water-absorbent and chemical-reactive, hence a viable choice for stringent infrastructure and production demands.
Specification
| Bitumen 85/35 | Test method | Unit | Specification |
|---|---|---|---|
| Specific gravity @25/25 °C | ASTM D70 | (Kg/m3) | 1.05 approx. |
| Penetration @25 °C | ASTM D5 | mm/10 | 30/40 |
| Softening point °C | ASTM D36 | °C | 80/90 |
| Ductility @25 °C | ASTM D113 | Cm | 1.5min |
| Loss on heating (wt) % | ASTM D6 | Wt. % | 0.2 max |
| Flash point °C | ASTM D92 | °C | 250 min |
| Solubility is CS2 (wt) % | ASTM D4 | Wt. % | 99.5 max |
| Spot test | A.A.S.H.T.O 102 | — | Negative |
FAQs
What are the advantages of Oxidized Bitumen 85/35?
It is very durable, highly thermally stable, has low water absorption, and high adhesion — and is thus best suited for industrial adhesives, roofing, and waterproofing systems.
Is it suitable for cold climates?
It performs best in moderate to hot climates. In very cold climates, performance may be compromised due to its higher viscosity.
How long can it be stored?
When stored, it retains quality for a period of 10 years from the manufacturing date.
What safety measures are required?
Employ PPE such as gloves, goggles, and masks. Provide good ventilation when heating and avoid skin contact or inhalation.
Is it safe for the environment?
Yes, if properly handled. Proper disposal and storage procedures should be used to reduce environmental effect.
