| The products are made by soaking the base in bitumen, or thermoplas ticityelastomer (such as styrene butadiene-SBS), or thermoplastics ( such as atactic polypropylene-APP, APAO, APAL) modified bitumen, then covering double faces with elastomer (SBS) or thermoplastics (APP, APAO, APAL) modified bitumen, and last... |