... by soaking the base in bitumen,or thermoplas ticiyelastomer SBS Modified Bitumen Waterproof MembraneThe products are made by soaking ... base in bitumen,orthermoplas ticiyelastomer (such as styrene butadiene-SBS),or thermoplastics (such as atactic polypropylene-APP,APAO.APAL ... )modifiled biumen,then covering double faces withwlastomer(SBS)or thermoplastics (APP,APAO,APAL)modified bitumen,and last ...