Oxidized Bitumen (or Blown Asphalt R75/25) is a semi-solid grade of this Bitumen type. R75/25 produce by Penetration Bitumen air blowing procedure. This grade formed at high temperature that this action leads to an increase in the Penetration Index. The name of R75/25 shows the midrange of softening point.
This grade of Bitumen is made by Pure Bitumen aeration, which leads to Bitumen oxidization with hot air. In this procedure, hydrogen atoms get a reaction with oxygen atoms, and the result is hydrocarbons with lower penetration and higher softening point than Pure Bitumen. Penetration Bitumen 60/70 is a raw material for the production of Blown Bitumen 75/25 and many other grades by passing very hot air through the Bitumen 60/70, the oxidation operation begins.
While that process is running, all parameters like temperature, pressure, oil content, etc., must be monitor and control. Without accurate monitoring and controlling parameters, desired goals will not achieve. Because of the special rubbery properties of this grade, it can be used in numerous industries.
Oxidized Bitumen R75/25 is defined by two numbers which are softening point and needle penetration, respectively. For this grade, softening point is equal to 75and needle penetration is equal to 25 desi-millimeter. These parameters are measured by an international test method named ASTM. According to this standard, softening point and penetration degree are obtained by ASTM D36 and ASTM D5, respectively.
For more information, you can refer to the Test Data Sheet (TDS) section.
Generally, Oxidized Bitumen has rubberier properties than penetration grades that give a wide range of industrial usage to this group of Bitumen. This type of Bitumen is suitable to seal joints and crack. High-temperature operations need a wide temperature range that Oxidized Bitumen has this property. Industries that use Blown Bitumen coating (especially pipe coating), waterproofing, mastic, flooring and facing, roofing, construction, glue and adhesives, carpet, sound damping, power, and electrical operations.
Moreover, other applications of Oxidized Bitumen are in the pilling industry as an anti-slip layer, in the car and automobile industries as an undercarriage sealant.
Heating Bitumen in most final uses is a critical stage. Generally, the most important thing in this procedure is heat control. Temperature and heat control can affect various aspects of the product, including its quality. The safe and recommended maximum temperature is 230℃.
All Oxidized Bitumen is not hazardous at below 100℃ during shipping operations. Heating and heat transfer should be control. Without good heat transfer may cause overheating and release, low flash vapors which these unwanted side products have a higher fire risk.
Also, melted bitumen should not be left in the boiler to get cold. Because it can cause overheating and needs more positional energy. Furthermore, placement and installing any temperature and pressure monitoring and control devices are very important. Because if their placement is not true, thermometers can’t display the actual temperature that it can leads to poor monitoring and thermal conductivity.
Everyone who works in Oxidized Bitumen plants should be wear gloves, masks (especial protective masks), and safety glasses. For more information, please refer to MSDS.
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