... 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 ... the bubble, scar depth of not more than 30% of sheet thickness, Per 1 square meter area within no more than ...