Chlorinated Polyethylene

The conventional method of waterproofing have become obsolete over a period of time
due to their short life & complexity of their application. On the other hand bitumen Asphalt
& coal tar are the two types of bitumen found to be excellent waterproofing properties
because of its versatile in nature. Despite their great waterproofing property, conventional bitumen viz, asphalt and coal tar
pitch being thermoplastic have undesirable temperature-dependent variations in their
physical properties. At subfreezing temperatures, they become brittle and glasslike & too Attempts were made to modify the thermoplastic properties of bitumen by using fillers like wax & oxidation of blown bitumen led to small success. But progress made in Polymer technology with the development synthetic plastic & synthetic rubber waterproofing system got new lease of life, birth of polymer modified bitumen membrane. It was observed that Atactic Polypropylene (APP) & Styrene Butadine Styrene (SBS) are two polymers compatible with Bitumen & enhances almost all the main properties of bitumen. fluid at a higher temperature.