Blown Bitumen is industrial bitumen which is dark, petroleum residue modified by the oxidation process. Blown Bitumen is produced by passing air through bitumen under controlled temperature conditions. Its consistency ranges from highly viscous to solid.Blown bitumen grade has technical advantages such as durability, flexibility, water resistant and chemical stability. There is different grade of blown bitumen as 115/15 90/40 85/25 85/25 90/15 95/25 75/25 150/5 105/30