Durobentonite 100 is a multi-layer sheet membrane waterproofing system. It consists of a self-sealing, expandable layer of bentonite laminated at the rate of approximately 4.8Kg per square metre to an impermeable, high density polyethylene (HDPE). The third component is a protective layer of spun polypropylene. Together, these three components form a tough, high performance waterproofing membrane manufactured in controlled thicknesses of 4.25mm to 5mm, specially designed for blindside installations such as lagging, under floor and elevator pits. Durobentonite 100 also withstands applications where shotcrete is blown directly into the face of the membrane.