geosynthetic clay layer geosynthetic clay layer(GCL) is a waterproofing material,made of compound geotextile,non woven geotextile with expansion bentonite in the center.It is specially used in artificial lake,landfill,underground garage,roof garden,tank,oil depot and other chemical yard.There are many small fibre 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. Huatao Group — New Geo-Material Add: A-708,Yihong Building ,No.298 Zhonghua North Street, Xinhua district,Shijiazhuang,Hebei,China. Tel: +86 311 80690567 Fax: +86 311 68008382 annie.lu@huataogroup.com www.htgeosynthetics.com