Polymer Modified Bitumen have binders whose properties have been modified by the use of a modifying agent which when added to the original bitumen alters its chemical structure and/or physical and mechanical properties in order to make it more resistant to temperature variations, weather and heavy traffic loads.

Commonly used modifying agents are polymers. Depending upon the nature of the polymer, these modifiers can be classified as :

Plastomers: EVA (Ethylene Vinyl Acetate) , EBA (Ethylene Butyl Acrylate), ETP (Ethylene Ter Polymer), etc.

Elastomers: SBS (Styrene-Butadiene Styrene), SIS (Styrene isoprene Styrene), etc.CRMB meets the specification of IS:15462 of 2004.