What is Oxidized Bitumen 85/40?
Oxidized bitumen 85/40, commonly referred to as blown bitumen, is a semi-solid petroleum bitumen grade produced by air-blowing asphalt flux. This flux is typically derived from oxidizing asphalt 60/70 with hot air.
Due to its distinctive physical properties, oxidized bitumen 85/40 has a wide applicability in numerous construction applications. The grade number, 85/40, gives the penetration value and softening point of the material. Its softening point is measured by the Ring and Ball method (ASTM D36), and the penetration value is given in 1/10 mm using ASTM D5 or IP49.
In the case of the quality and performance, each batch of blown bitumen 85/40 must undergo rigorous processes of quality control, including complete testing and inspection before shipping out. Oxidized bitumen, compared to viscosity or penetration-grade bitumen, is better suited to demanding applications since it has a higher softening point, which affords greater resistance to temperature variation.
Application of Oxidized Bitumen 85/40
The main field of application of oxidized bitumen 85/40 is in the industrial field, especially in paints, mastics, flooring, pipe coating, and roof insulation. It is classified according to its penetration rates and softening points. This bitumen is applied in the production of roofing and isolation membrane sheets and for sealing and insulating buildings.
In various industries, like chemical, construction, road paving, textile processing, and civil works, 85/40 is used as an adhesive, crack sealant, dust-binding agent, and additive for construction materials. It is also used in the production of rubber, plastic products, and asphalt-based paints for corrosion protection. It is also a base for synthetic turf, electrical laminates, and hydraulic applications.
Bitumen 85/40 is very adaptable due to its resistance to heat and finds perfect application in pipe coatings, roofing, and the manufacture of paints at very hot weather conditions.
Advantages of Oxidized Bitumen 85/40
Oxidized Bitumen 85/40 is a high-purity, non-toxic, and flexible material that conforms to ASTM standards for softening point and penetration. It offers excellent adhesive, low water absorption, and is chemically stable. It is highly resistant to soil, cold, and electrical stress. The product is available in various packaging options, including meltable bags, Kraft bags, carton boxes, blocks, kegs, and drums. It has a high monthly capacity for production and provides full coverage and support.
Storage and Handling of Bitumen 85/40
Oxidized bitumen has 10 years of validity with multi-time heating and cooling. Please refer to MSDS for more information.
Health & safety of blown asphalt 85/40
Usually heated and melted in on-site boilers, packaged bitumen is an essential step in final applications. For the sake of product quality, safety, and health, control throughout the heating process is crucial. Aggressive heating can result in thermal cracking and localized overheating, and the maximum safe handling temperature is 230 C. It is not advisable to reheat melted bitumen from cold in the boiler since this may cause low flash vapors and overheating. Because bitumen has a low thermal conductivity, it is essential that temperature monitoring or control devices be placed properly.
Packing
• Meltable Polyamide Bags (20KG) (25 Kg)
• Carton Box (20KG) (25 Kg) (40kg)
• Kraft Bags (20KG) (25 Kg) (40kg)
• Blocks (20KG) (25 Kg) (40kg)
• Drums (20KG) (25 Kg)
Other kinds of packing and Size are welcome from clients.
Specification
| Oxidized Bitumen 85/40 | Specification | Test Method |
|---|---|---|
| Specific gravity@25/25 ˚C | 1.05 approx | D-70 |
| Penetration@25 ˚C | 35-45 | D-5 |
| Softening point ˚C | 80-90 | D-36 |
| Ductility@25 ˚C | 3 | D-113 |
| Loss on heating (wt)% | 0.5 | D-6 |
| Flash point ˚C | 230 min | D-92 |
| Solubility in CS2 (wt)% | 99 min | D-4 |
