Oxidized Bitumen 85/25 is a standard oxidized grade bitumen usually used for various purposes in the construction business. This grade of bitumen is normally used as a base raw material for bituminous pipe coatings, roofing membranes, various waterproofing purposes and coats in the automotive industry and many more in our day to day life. Oxidized Bitumen is produced from penetration grade bitumen, which is blown by hot air in a controlled process until the desired specification is reached. Oxidized Bitumen can be supplied in any grade and are designated by two numbers to indicate the mid-points of their softening point and penetration ranges.