APP modified asphalt rolling material

The products are made by soaking the base in bitumen,or thermoplas ticiyelastomer (such as styrene butadiene-SBS),or thermoplastics (such as atactic polypropylene-APP,APAO.APAL)modifiled biumen,then covering double faces with wlastomer(SBS)or thermoplastics (APP,APAO,APAL)modified bitumen,and last finishing the upward face with fine sands,mineral slates (or geains)or polythene membrane etc.While downward face with fine sands or polythene membrane