In order to bond preformed sheets together and to the structure made by oxidized bitumen 60/70 with hot air, oxidized bitumen 105/35 is the best oxidized asphalt grade to be used as adhesive in hot melt systems at approximately 1 Kg/m3. 105/35 oxidized bitumen is a semi-solid oxidized grade of pure petroleum bitumen manufactured by blowing air through an asphalt flux. Different applications of its physical properties can be found in the construction industry.
Geflow guarantees the quality of our oxidized bitumen 105/35 with the arrangement of the international inspector to check the quality and quantity during the loading of the vessel and controlling the production by QC by batch test report before shipping. Geflow guarantees the quality to meet ASTM standards.
Recommended Uses
Mostly used for bitumen coats, roofings, insulations, and isolation membrane sheets.
In chemical, fuel, paint, lacquers, varnishes, paper and pulp, textile processing, oxidized bitumen 105/35 is a commonly used product. Additionally, it is used in road construction, pavement, crack sealing, and in roof construction, civil works, and roofing. The product is also used in sealing and insulating buildings, additives for construction materials, dust binders, coatings, insulating and impregnating agents, rubber and plastics.
The products from blown asphalt 105/35 are used in paving and roofing, as well as in corrosion protection paints for metals, adhesives in electrical laminates, and synthetic turf and roof coatings, pipe coatings, Portland cement pavement, hydraulic applications, and paint.
Technical Advantages of Oxidized Asphalt 105/35
- Durability
- Flexibility
- Water Resistant
- Chemical Stability
Oxidation process of bitumen 105-35
Through the correct selection of the crude oil feedstock and operating conditions, oxidized bitumen 105/35 with a particular specification can often be produced directly from the distillation process. It may be necessary to ‘air blow’ the short residue in order to further modify its physical properties. An oxidation process involves passing air through the short residue either batch-wise or continuously, while the short residue is heated between 240 and 3208 degrees Celsius. As a result of blowing, small molecules with relatively low molecular weight are converted into larger molecules with relatively higher molecular weight. In the end, an air-blown bitumen is less susceptible to temperature changes since it penetrates less easily and develops a higher softening point.
Storage and Handling
Almost all final uses require the packaging of bitumen to be heated. Typically, the packaged material is heated and melted in boilers out on site.
As well as maintaining the quality of the product, control at the heating phase is crucial.
You should note that 230 C is the maximum safe handling temperature, and this shouldn’t be abused. It is of utmost importance to control the heating phase of the bitumen since it is not a good conductor of heat.
Oxidized Bitumen material should be broken up before being placed in the boiler. As a result, a larger surface area is exposed to the heat and a more even heating process is achieved. Without more exposed surface area, aggressive heating at the base and sides of the boiler may result in localized overheating, altering the characteristics of RAHA modified bitumen and potentially causing thermal cracking of the bitumen, creating low-lash vapors. Since these low flash vapors determine the fire risk, the flash point of the oxidized bitumen is irrelevant.
If bitumen is left in the boiler and reheated from cold, there is a high potential for localized overheating (lack of convection equals poor heat transfer) and the development of a pressurized pocket of low flash vapors.
Placement of temperature monitoring or control devices should be considered. Due to the poor thermal conductivity of the bitumen, a thermometer in the bitumen far from the heat source could read significantly different (by hundreds of degrees) from the true temperature of the bitumen.
Packing of blown asphalt 105/35
Chemical Mine World produces blown asphalt 105/35, including kraft bags, plastic bags and drums. This asphalt is made by blowing hot air through penetration grade bitumen in a controlled process until the desired qualities are met.
In order to specify the softening point and penetration range, Chemical Mine World oxidized bitumen 105/35 is designated by two numbers.
Desimillimiter 105/35 is a 105°C softening point and a 35°C penetration desimillimiter produced in accordance with ASTM standard and meets the following specifications.
Specifications of oxidized bitumen 105/35
| Bitumen 105/35 | 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 | ASTM D36 | °C | 100/110 |
| Loss on heating | ASTM D6 | Wt. % | 0.2 max |
| Flashpoint | ASTM D92 | °C | 250 min |
| Solubility in CS2 | ASTM D4 | Wt. % | 99.5 max |
| Spot test | AASHOT102 | --- | Negative |
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