GEOSYNTHETIC CLAY LAYER(GCL) is a waterproofing material,made of compound geotextile,non woven geotextile with expansion bentonite in the center. There are many small fiber space in GCL after being needle punched,then the bentonite powder can not more in one direction,so when meeting water,it will become a high density waterproofing layer and stop water leakage efficiently.
It will swell when meet water. Also have the function if separation, reinforcement, protection, filtration. It has a long time waterproofing,friendly to environment.