One of the penetration bitumen grades is Penetration
Bitumen 80/100; this grade has a lower ductility than
previous grades like Penetration Bitumen 10/20 and 35/50
and has more ductility than grades higher than itself,
like Penetration Bitumen 160/220 and 200/300.
This grade of bitumen is manufactured through the vacuum bottom
oxidation process. This product leaves the distillation tower
when its penetration is between 80 to 100 desi-millimeters.