Bentonite waterproofing sheet (4mm, 5mm)
Geosynthetic clay liner (GCL) with sodium bentonite between geotextiles. Typical properties include bentonite mass >4.2 kg/m2, swell index >=24 mL/2g, and hydraulic conductivity <=5 x 10^-10 m/s (ASTM D5887).
Geosynthetic clay liner (GCL) with sodium bentonite between geotextiles. Typical properties include bentonite mass >4.2 kg/m2, swell index >=24 mL/2g, and hydraulic conductivity <=5 x 10^-10 m/s (ASTM D5887).
Bentonite waterproofing sheets (GCLs) are geosynthetic clay liners consisting of sodium bentonite between geotextiles, mechanically bonded by needle-punching. Australian GCL data report total mass >4.5 kg/m2 with bentonite mass >4.2 kg/m2 (ASTM D5993) and swell index >=24 mL/2g (ASTM D5890). Hydraulic conductivity is typically <=5 x 10^-10 m/s (ASTM D5887), providing a low-permeability barrier for below-ground waterproofing and containment.
- Low hydraulic conductivity (<=5 x 10^-10 m/s) under ASTM D5887 index conditions
- High swell index (>=24 mL/2g) and controlled bentonite mass per unit area (ASTM D5890/D5993)
- Verified tensile/rupture and peel strengths via ASTM D6768/D6496
- 01 Low hydraulic conductivity (<=5 x 10^-10 m/s) under ASTM D5887 index conditions
- 02 High swell index (>=24 mL/2g) and controlled bentonite mass per unit area (ASTM D5890/D5993)
- 03 Verified tensile/rupture and peel strengths via ASTM D6768/D6496
- 01 Performance is product-specific and requires manufacturer data for design
- 02 Compatibility testing required for aggressive chemical environments
- 03 Heavy rolls require mechanical handling and installation planning
- Density
- >=4500 g/m2 Total GCL mass per unit area (ASTM D5993) from Australian supplier data.
- Water absorption
- >600 % Coefficient of water absorption reported with ASTM D4643 for GCL bentonite.
- UV resistance
- 72 hours Maximum exposure before cover required. Significant degradation after 6 months if unprotected
- Chemical resistance
- Good pH stability range 2-14
- pH tolerance
- 12 pH range 2-14 Operational pH range
- Tensile strength
- >10.4 kN/m Rupture/tensile strength (ASTM D6768) from Australian supplier data. Grab strength >600/800 N (ASTM D4632) and peel strength >120 N (ASTM D6496) are also reported for GCLs.
- Shear strength
- 24 kPa Typical hydrated internal shear strength per ASTM D6243 (manufacturer data).
- Creep resistance
- Good