Elastomeric-plastomeric polymer distilled bitumen waterproofing membrane. POLYFLEX XFIRE P is a prefabricated ELASTOMERIC-PLASTOMERIC (Plastomer-Polymer Bitumen) waterproofing membrane offering excellent performance. Made from a special distilled bitumen compound modified with a high percentage of special polymers such as POLYPROPYLENE (APP) and POLYOLEFIN (APAO), with the addition of special anti-ageing additives that provide blends with superior performance characteristics. POLYFLEX XFIRE P is BROOF(t2) certified to the requirements of the external fire performance standard EN 13501-5.