Oxidized Bitumen 90/40 Description
Oxidized bitumen 90/40 (in other words, Blown asphalt 90/40, blown bitumen 90/40) is Semi Solid grade of pure petroleum bitumen manufactured by air-blowing through an asphalt flux. Special physical properties of its grade can be used in different applications in the construction business. blown asphalt 90/40 is based on petroleum bitumen which is made by blowing asphalt 60/70 by very hot air. The numbers relate to the midpoint of the material’s softening point and penetration respectively. The softening point value is the degrees Centigrade measured by the Ring and Ball method as determined by ASTM D36. The penetration value is in 1/10 mm as determined by IP49 or ASTM D5.
Oxidized Asphalt is a solid or semi-black solid material and gradually liquid when heated, oxidized asphalt is the predominant content bitumen, asphalt, molten (oils), and aromatic resins. The oxidized asphalt or blown asphalt is producing in different softening point and penetration.
Oxidized Bitumen 90/40 Applications
Blown Asphalt 90/40 is a semi-solid oxidized grade of pure petroleum bitumen categorized in polycyclic aromatic hydrocarbons that are normally used for different purposes in the construction business.
Blown Asphalt 90/40 is widely used as an anti-slip layer compound in the piling industry, for the manufacture of roofing felts, the roofing and waterproofing industries, for sound dampening felts and undercarriage sealant in the automotive industry, electric cable joint protection, joint filling compound, carpet-backing, corrosion protection, acoustic panels, chemical, fuel, Manufacture of paints, sealant compound, and many others. Also used in sealing saw cuts and joints where expected movements are minimum. It is also used in the manufacturing of bituminous marine mastic for the oil & gas pipeline joints. Further, Blown Asphalt is used in the manufacture of bituminous marine mastic, which is required for the oil and gas pipeline joints.
Blown Asphalt has several usages in the industry
Oil and Gas industries:
- Coating materials for pipelines and pipe joints of Oil Also Gas Pipelines.
Electrical industries:
- The sealant of wire coating
Waterproofing industries:
- Building roofing felts in factories and first materials components who are producing waterproofing roofing felt sheets
Bitumen and Asphalt:
- Road paving, Asphalt, construction.
- Making Sound insulation layers.
- Car tires and lining.
Technical Advantages of Oxidized Bitumen 90/40
- Durability
- Flexibility
- Water Resistant
- Chemical Stability
Compared to paving grade bitumen:
- Reduced temperature susceptibility
- Exhibits a more ‘solid’ nature at ambient temperatures
- High penetration index
Recommendations for Handling / Storage
The heating of packaged bitumen is a critical phase in most of the final uses. Typically, the packaged material is heated and melted in boilers out on site.
However, control at the heating phase is very important in terms of health and safety as well as in maintaining the quality of the product.
A note must be taken of the maximum safe handling temperature of 230 C and this should not be abused. Bitumen is a poor conductor of heat, consequently, control of the heating phase is of paramount importance.
The Oxidized Bitumen material should be broken up prior to placement in the boiler. This exposes a larger surface area to the heat and encourages a more even heating regime. Without the larger exposed surface area, aggressive heating at the base and sides of the boiler may well result in localized overheating, altering the characteristics of the RAHA modified bitumen, and potentially causing thermal cracking of the bitumen, creating the release of low lash vapors. The flashpoint of the oxidized bitumen then becomes irrelevant; as these low flash vapors determine the fire risk.
Melted bitumen should not be left in the boiler and reheated from cold, as there is then a high potential for localized overheating around the heating area (lack of convection means poor heat transfer) and potential development of a pressurized pocket of low flash vapors.
Be aware of the placement of any temperature monitoring or control devices. As a result of the poor thermal conductivity of the bitumen, a thermometer in the bitumen some distance from the heat source could read significantly different (even hundreds of degrees) from the true temperature of the bitumen near the heat source.
For Health and Safety information, please make reference to the relevant MSDS.
Health & Safety
Workers should wear protective masks, gloves, and goggles during application. The asphalt can be removed from equipment and tools with kerosene or gasoline. Care should be taken when heating Blown Asphalt 90/40 to avoid overheating.
Packing of Oxidized Bitumen 90/40
Blown Asphalt 90/40 in various packing, including bitumen 90/40 is available in 20 & 50 kg Kraft Paper Bags / Poly Amide Bags, 25 kg Carton box, and 150, 180, 200kg Steel Drums. In addition, oxidized bitumen packing also palletize, 40 bags can stack on the pallet. 20 pallets can load to the 20ft container.
Technical Data Sheet of Blown Asphalt 90/40
| Bitumen 90/40 | Test method | Unit | Specification |
| Specific gravity @25/25 C | ASTM D70 | (Kg/m3) | 1.05 approx. |
| Penetration @ 25°c | ASTM D5 | mm/10 | 35/45 |
| Softening point °c | ASTM D36 | °C | 85/95 |
| Ductility @25 °c | ASTM D113 | Cm | 5.5min |
| 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.O.T102 | — | Negative |