... protection advantages.The use of up to 50 years. PVC waterproof roll:PVC waterproof roll has non-toxic,odorless,environmental protection advantages ... tunnel,highway,The use of up to 50 years.1,pvc is the main material ,and still include no composite materials ... be cut neatly2. the roll surface should be smooth, neat edges, no cracks, holes and bonding3. roll surface of the bubble ...