Oxidized Bitumen 105/15 is also known as Blown Bitumen 105/15 (R105/15), is a hard grade of this bitumen category.
R105/15 has a lower needle penetration than R105/35. Penetration Bitumen 60/70 is a raw material and the base of other bituminous products like Blown Bitumen 105/15.
Oxidized Bitumen 105/15 is produced by aeration of pure Penetration Bitumen 60/70. The pure bitumen is exposed to very hot air under special temperature and pressure conditions that are completely controlled to obtain the product with the required characteristics.
Blown Bitumen 105/15 is classified by two numbers which are softening point and needle penetration degree. These parameters are measured with international test methods of ASTM .