Density: Sodium bentonite forms a high-density diaphragm under water pressure. When the thickness is about 3mm, its water permeability is α×10 -11 m/sec or less, which is equivalent to 100 times the compactness of 30cm thick clay. Strong self-protection performance. It has permanent waterproof performance: Because sodium-based bentonite is a natural inorganic material, it will not cause aging or corrosion even after a long period of time or changes in the surrounding environment, so the waterproof performance is durable. Simple construction and short construction period: Compared with other waterproof materials, the construction is relatively simple and does not require heating and pasting. Simply connect and fix with bentonite powder and nails, gaskets, etc. No special inspection is required after construction, and it is easy to repair if it is found to be waterproof. GCL is the shortest construction period in existing waterproof materials. Not affected by temperature: it will not be brittle in cold weather conditions. Integration of waterproof material and object: When sodium bentonite reacts with water, it has a swelling capacity of 13-16 times. Even if the concrete structure vibrates and settles, the bentonite in GCL can repair the crack on the concrete surface within 2mm. Green and environmental protection: Bentonite is a natural inorganic material that is harmless and non-toxic to the human body, has no special impact on the environment, and has good environmental protection.