Elastomeric polymer distilled bitumen waterproofing membrane. ELASTOSHIELD TS4 EL C is a prefabricated ELASTOMERIC waterproofing membrane offering excellent performance. Made from a special modified distilled bitumen compound with a high percentage of elastomeric SBS thermoplastic rubbers (Styrene-Butadiene-Styrene). ELASTOSHIELD TS4 EL C is a membrane produced to the standards set by NAT technology, the innovative production system for the control of polymer matrix ageing in bitumen membranes. ELASTOSHIELD TS4 EL C has a COMPOSITE spunbond polyester nonwoven carrier, stabilized with glass strands in both directions. The carrier gives great tensile strength and excellent dimensional stability, in both the cross and machine direction (isotropic behaviour).