Blown Asphalt 90/40
General Description of Blown Asphalt 90/40
Blown Asphalt 90/40 is an oxidized asphalt produced by air-blowing selected petroleum asphalts without the addition of catalysts. This type of asphalt has a high softening point, high flash point, and remains stable during the melting process. It is mainly used in the Mediterranean region, particularly in Morocco, and is produced by blowing penetration grade bitumen (such as bitumen 60/70) with hot air at high temperatures. This air-blowing process results in a material with a higher penetration index and rubbery properties compared to penetration or hard grade bitumens, making it ideal for various industrial applications.
RAHA Bitumen 90/40 is based on petroleum bitumen, which is created by blowing bitumen 60/70 using very hot air. The designation “90/40” refers to the midpoint of the material’s softening point and penetration range, with the softening point measured using the Ring and Ball method (ASTM D36) and penetration determined by the IP49 or ASTM D5 method. The production process is done either through a continuous or staggered blowing process, which controls the oil content in the bitumen while it is oxidized.
RAHA Group is a market leader in the production, export, and brokerage of various grades of Blown Asphalt, known for its excellent quality. The company’s experienced sales team is dedicated to understanding customer requirements and providing expert assistance. For more information or to place an order, customers are encouraged to contact the sales team.
Uses of Blown Asphalt 90/40
Blown Asphalt 90/40 is a semi-solid oxidized grade of pure petroleum bitumen and falls under the polycyclic aromatic hydrocarbons category. It has wide applications in the construction industry. This material is normally used as an anti-slip layer in the piling industry, in the manufacture of roofing felts, and for waterproofing purposes. It also plays an important role in sound dampening felts and undercarriage sealants in automotive industries.
Furthermore, the uses of Blown Asphalt 90/40 include electric cable joint protection, joint filling compounds, carpet backing, corrosion protection, and acoustic panels. It is also used to seal saw cuts and joints that are subject to negligible movement.
Blown Asphalt is also used in the oil and gas industries for the manufacture of bituminous marine mastic for pipeline joints. The product is also applied as a protective coating for pipelines and pipe joints in both the oil and gas industries. In the electrical industry, it is used as a sealant for wire coatings.
It is a very vital raw material used in the manufacture of roofing felts and waterproofing materials within the waterproofing industry. Other uses of Blown Asphalt 90/40 include road paving, asphalt construction, and sound insulation layer construction. It also finds application in the manufacture of car tires and linings, hence finding so many applications in different industry segments.
Technical Advantages of Blown Asphalt 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
Handling and Storage
Heating of packaged bitumen is a very crucial process and needs much care in control, for both the quality and safety of the product. The maximum operating temperature for safe operation is 230°C, which should not be exceeded. Bitumen has poor heat conductivity, hence calling for control in the heating phase of operation to avoid overheating.
Bitumen that has oxidized should be broken up before placement in the boiler to expose more surface area to heat; this ensures even heating. If not, aggressive heating could lead to localized overheating, which will alter the properties of the bitumen and release low-flash vapors that increase fire hazard.
Melted bitumen also must not be reheated from cold because localized overheating and pressurized vapor pockets might result.
Temperature monitoring devices must be placed thoughtfully since readings away from a heat source might not reflect what the true temperature is near the source. For more information, see the Material Safety Data Sheet (MSDS) appropriate for guidelines regarding health and safety.
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 over heating
Packing of Blown Asphalt 90/40
RAHA GROUP is the manufacturer of 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 pallet 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 |