Oxidized Bitumen or Blown bitumen grades are produced by passing air through the penetration grades. This process gives the bitumen more rubbery properties than its original formula and they are simply harder bitumen. Hard bitumen under controlled temperature conditions 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 under carriage sealant in the automotive industry.
Oxidized Bitumen ,Blown Asphalt or Blown Bitumen is produced by either Continuous or Staggered Blowing Process. Heated Penetration Grade Bitumen under controlled environment is blown with air which controls the Oil Content in the Bitumen while it is oxidized. The different grades for suited applications that produced are designed by two numbers to indicat.
The most popular grades are; grades 95/25, 85/25, 90/40, and 115/15. We are also capable of producing other grades of Oxidized bitumen upon request by our customers. Oxidized Bitumen high softening temperatures qualify them as the excellent sealant for prevention from bleeding in high-temperature applications. Blown Grade Bitumen shall be broken up into small pieces (for the blown grade in molded cake form) and heated slowly to the application temperature of 220ºC to 230ºC.
Some of the major advantages of Oxidized Bitumen are that it is completely water resistant, highly flexible and durable. Further, it is chemically very stable. Oxidized bitumen is a very flexible compound that is not only chemically stable but also a very durable compound apart from being completely water resistant. Lastly, Oxidized Bitumen has some very prominent technical advantages that make it a very sought after compound in various applications.
1. Bitumen heating to 230-270 °C
2. Transferring melted bitumen to blowing towers
3. Blowing air to bitumen
4. Cooling melted bitumen with water
5. Packing
The blowing should be done from the bottom of blowing tanker. The reaction between bitumen and air is calorific. If the heat produced during the mixture is high, the heat of reaction is controlled by water injection.The admixture of air and the volume of blowing air is two important variants in blowing process. In bitumen producing the plant, Bitumen 60/70 is usually got by blowing. In this case for making bitumen 90/15 or 85/25 distilled used oil or crude oil should be injected to the product according to the volume 20-25 % otherwise the fragility in bitumen lead to inferior production.
Increasing the heating temperature, air injection amount, time and tower pressure increase the speed of production process reaction. The suitable temperature for production operation is 265-270°C which should be controlled not to be ascended since in high temperature and in 288°C intensity of reaction becomes more severe and uncontrollable which lead to the explosion in the tower.
The long time stay of bitumen in the tower in any condition is not in favor of system and should be delivered to drum or empty tanker after being ready.
If the liquid surface in blowing tower is low, not more than particular limit should be added to the system for the extra air gather in empty parts and lead to ignition nearly. And if the temperature is kept high, the inside heat of tower ascend fats and this issue cause inside explosion and endamage the system.
Blowing tower is filled up to 70%. Air injection is done in 190-232°C. The final point of blowing is specified by sampling and testing of bitumen properties. Finally, the temperature of the product should be kept 150- 165 °C in order to have loading and packing capability.
Oxidized Bitumen has a wide variety of industrial applications
• As a hot-applied waterproofing layer.
• Carpet tile manufacture.
• As a raw material for liquid bitumen coatings.
• For rust proof pipe coatings.
• Used as an anti-slip layer compound in the piling industry.
• Used for production of roofing and sound dampening felts, Used as under carriage sealant in the
• Weatherproof packaging for flexibility of storage.
• High capacity, quality assured manufacture.
• Conforms to ASTM standards with regards to softening point and penetration.
Oxidized Bitumen in various packing, is available in 20 & 50 Kg Kraft Paper Bags 25 Kg Carton box & 200 Kg Steel Drums:
It is most expensive packing since there is mold on and with same mold, we can ship out. The mold is carton and at destination you can remove the mold easily.
It is a heat resistance bag and filling directly in water to cool down fast. It is firstly use not possible to take out the Polyamide from the bitumen and then use.
Craft bag is recycle packing and inside is special material to prevent sticking the bitumen to bag. This grade is also possible to load on pallet or without pallet for customer.