Tpo Waterproof Membrane For Traffic Engineering Product Introduction TPO waterproof membrane for traffic engineering mainly adopts high-str fabric-reinforced type P products, with type L membranes with fiber backing used in some invert parts. Its mainstream thicknesses are 1.5 and 1.8mm. The tear resistance and impact performance of this product are much higher than those of ordinary civil TPO membranes It is specially designed for the complex working conditions of transporta