A sand-coated HDPE membrane is a high-density polyethylene liner with a sandy textured surface, designed to bond firmly with poured concrete or soil, offering a fully bonded, watertight seal. It's widely used for waterproofing critical civil structures such as basements, raft foundations, tunnels, pipelines, retaining walls, subways and water- retaining infrastructure. The sand coating greatly improves adhesion and friction, reducing slippage on slopes and enhancing stability under settlement or movement. Its excellent puncture and chemical resistance, along with UV and weather durability, ensures long service life in aggressive environments.