Description of Oxidized Bitumen 75/35
Oxidized Bitumen 75/35 is a semi-solid oxidized petroleum bitumen, and it comes under the group of polycyclic aromatic hydrocarbons. It is produced by blowing hot air into Bitumen 60/70, which causes oxidation. This treatment oxidises the bitumen by reacting with oxygen, which makes it more stiff, water-repellent, and adhesive.
The nomenclature 75/35 refers to two major features:
75°C is the softening point, the temperature when the bitumen starts to soften and lose firmness.
35 is the penetration grade, the depth that a standard needle can penetrate the bitumen (to tenths of a millimeter) under test conditions.
It will need to be warmed to approximately twice its softening point temperature (200°C to 300°C) to permit proper flow and viscosity for application.
Oxidized Bitumen 75/35 is also known by many other names including:Blown Asphalt 75/35, Blown Bitumen 75/35, Oxidizing Bitumen 75/35, Oxidized Asphalt 75/35, Air Blown Asphalt 75/35, Air-Rectified Bitumen 75/35
Application of Oxidized Bitumen 75/35
Oxidized Bitumen 75/35 is widely used in several industries due to its unique character. It is utilized as a raw material for protective coatings, insulation, and roofing, e.g., use in isolation bitumen membrane sheets. It is also used in chemical production, fuel processing, paints, lacquers, varnishes, paper pulp, and textile processing. In construction, it is utilized in road construction, pavement, sealing of cracks, and civil construction.
It is utilized as a sealant and insulating material in buildings, adhesive, and construction material additive. Its use also extends to dust binding, manufacture of rubber and plastic products, use in coating pipes, corrosion protection of metals, and as an industrial coating and paint base. The physical properties of Oxidized Bitumen 75/35 make it best used for application under hot conditions and harsh applications where toughness and high adhesion are required.
Advantages of Oxidized Bitumen 75/35
Some of the prominent advantages are:
Excellent durability and water resistance
High adhesion
Relevant to roofing and flooring
Assists in building roads and pavements
Common in paint and textile processing industries
Health & Safety Procedures for the Handling of Oxidized Bitumen 75/35
For safety, personnel should:
Work in ventilated areas so as not to inhale vapors released when bitumen is heated.
Wear heat-resistant gloves, safety boots, long-sleeved tops, long trousers, and safety glasses.
Store bitumen away from open flames or sparks, and have fire extinguishing equipment handy due to high operating temperatures.
Packaging and Loading Information
25 kg PP Bags: Palletized and shrink-wrapped. Loading capacity: 920 bags per 20ft container (~23 tons net).
25 kg Carton Boxes: Palletized and shrink-wrapped. Loading capacity: 880 boxes per 20ft container (~22 tons net).
Available Packaging Options for Oxidized Bitumen 75/35
BituKim offers various packages for customer convenience:
Kraft bags
Meltable plastic bags
Drums
Bulk asphalt
Produced by controlled hot air blowing of penetration grade bitumen until the required condition is met.
Compliance and Standards
BituKim’s 75/35 oxidized asphalt complies with the ASTM standards. The grade designation (75/35) is a softening point of 75°C and a penetration of 35 deci-millimeters.
Specification of Oxidized Bitumen 75/35
| Bitumen 75/35 | 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 | 70/80 |
| Loss on heating(wt) % | ASTM D6 | Wt. % | 0.2 max |
| Flashpoint 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 |
