GCL-4 consists of a layer of bentonite encapsulated between two geotextiles (a nonwoven and a woven polypropylene geotextiles), needle punched together and laminated on one side to a polyethylene membrane for maximum performances under a wide variety of field conditions. This integrated matrix of bentonite and needle punched fibers provides high shear strength and allows the GCL-4 to keep low permeability even in presence of adverse installation conditions. The GCL-4 has high internal shear strength characteristics for steep slope applications.

GCL-4 is designed for below-grade vertical and horizontal structural foundation surfaces. Typical cast-in-place concrete applications include backfilled concrete walls, earth-covered roofs, structural slabs, tunnels, and property line construction. Property line construction applications include soldier pile and lagging, metal sheet piling, shotcrete and stabilized earth retention walls. Applications may include structures under continuous or intermittent Hydro-static pressure. Where contaminated ground-water or salt-water conditions exist, use GCL-4 with contaminant resistant sodium bentonite. GCL-4 resists higher levels of the following contaminant’s: nitrates, phosphates, chlorides, sulfates, lime and organic solvents.

Our GCL  have two kind of types that are GCL-NP and GCL-OF. The GCL-NP type are consisted of three layers, the top is nonwoven geotextile, the middle is sodium bentonite, and the bottom is woven geotextile. This type GCL is widely used in landfill, lagoon, river bottom, and basement and so on. The GCL-OF have four layers including the introduced three layers, which have one additional HDPE membrane bonded with the nonwoven geotextile to form the compound waterproofing layer. This kind GCL is widely used in subway, basement, tunnel, and other underground projects and salt water area and harsh environment.

Model		GCL-3	GCL-4	GCL-5	CUSTOMIZED	COMMENTS
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Weight of bentonite granular		3000g-7000g/m2	3500g-7500g/m2	4000g-10000g/m2	4000g-10000g/m2	Can be customized as required
Water content		8-12%	8-12%	8-12%	8-12%
thickness		5-7mm	5-8mm	6-10mm	5-8mm
Thickness of HDPE liner		No liner	0.1-0.5mm	No liner	0.1-0.5mm
Swell index of bentonite granular		≥24	≥24	≥24	≥24	24,25,26,27
nonwoven geotextile	Weight	180-300g/m2	180-300g/m2	180-300g/m2	180-300g/m2
	Polypropylene or po	PP and PET or customized	PP and PET or customized	PP and PET or customized	PP and PET or customized	Percentage of PP can be customized
Wonven fabric	Material	Polypropylene	Polypropylene	Polypropylene	Polypropylene
	Weight	110g, 130g, 150g	110g, 130g, 150g	110g, 130g, 150g	110g, 130g, 150g	Usual stock is 130g/m2 and other weight needs to be customized
	Woven method	Circular or plain	Circular or plain	Circular or plain	Circular or plain
Tensile strength		≥600N/100mm	≥800N/100mm	≥800N/100mm	≥600N/100mm
Peel strength		≥40N/10cm	≥50N/10cm	≥40N/10cm	≥40N/10cm
Permeability coefficient(cm/s)		≤5.0×10-11	≤5.0×10-11	≤5.0×10-11	≤5.0×10-11
Water resistant static pressure(0.4mpa, 1h)		No leakage	No leakage	No leakage	No leakage