Xiushen Butyl Rubber Waterproof Sealing Tape Xiushen Butyl rubber waterproof sealing and bonding tape is a premium, environmentally friendly, solvent-free material. Engineered by blending butyl rubber with polyisobutylene, it offers superior performance for demanding sealing applications. Key Advantages Mechanical Excellence: High bonding and tensile strength with superior elasticity. Adaptability: Strong resistance to interface deformation and cracking. Durability: