Blown Bitumen is also known as Mastic. It is the oldest construction products, and the oldest waterproofing, roof sealing and road surfacing material, in use for centuries. Blown Bitumen is a bituminous design mix containing ingredients bitumen, coarse aggregate, fine aggregate and filler material.

Blown Bitumen is available in various grades such as 10/20, 20/30, 30/40, 85/25, 115/15 & 90/15. It is working as a waterproofing material and used as wearing course for a whole range of construction work of roads and bridges. It protects structural concrete and flexible pavement top from wear and tears due to environmental impact. Percentage of bitumen content consider for the design of mastic asphalt is preferably 14–17%. it is also used for roofing, tanking and flooring to avoid seepage of water.