Oxidized Bitumen 105-15 created by further vigorous air process another names of it is blown asphalt105/15, oxidized bitumen 105/15, hard bitumen. It also is Semi Solid grade of pure petroleum bitumen made by air-blowing through an asphalt flux. Because of physical specs it  uses in construction.

Passing air through bitumen at elevated temperature can used to alter its physical properties. Degree of oxidation ranges from very small, or semi-blowing, through to “full” blowing. Bitumen specs are significantly different to penetration grade bitumens.
Nomenclature and grading for the oxidised bitumen products is based on a combination of  temperature. At which bitumen reaches a certain “softness” when being heated up as expressed by ring and ball softening point test, and the penetration value