... 2mm,,1.5mm,,2.0mm PHYSICAL PROPERTY 1. good combination of high eladticity and tensile strength 2. fire -resistance to ... ,installing secure 10,easy treatments to the delicate parts of corners and edges 11.convenient maintenance with low cost PVC ... back is widely usd in the roofs of civil buildings ,tunnels ,channels ,subways ,highways ,planting roofs ,the roofs of steel frame structure buildings