MATERIAL DATA SHEET

Bentonite waterproofing sheet (4mm, 5mm)

Membrane
composite › Clay-Polymer › Membrane
compositeclay-polymerbentoniteGCLwaterproofingself-healingsustainablebelow-groundhydraulic-barrier
ATLAS CODE
COM-CLY-MEM-001
Bentonite waterproofing sheet (4mm, 5mm)
Category composite
Material Family Clay-Polymer
Density
>=4500 g/m2
Description

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.

Primary Sectors
[Transport & Infrastructure][Industrial]
Typical Uses
  • Below-ground waterproofing for basements and foundations
  • Tunnel and underground structure waterproofing
  • Retaining wall waterproofing
  • Landfill base and cap lining systems
  • Mining heap leach pads and tailings dams
  • Agricultural and aquaculture pond lining
  • Contaminated land remediation barriers
  • Secondary containment for chemical storage
  • Green roof waterproofing systems
  • Marine and coastal structure protection
  • Cut-off walls and vertical barriers
  • Temporary dewatering applications
Advantages
Low hydraulic conductivity (<=5 x 10^-10 m/s) under ASTM D5887 index conditionsHigh 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
Cautions
Performance is product-specific and requires manufacturer data for designCompatibility testing required for aggressive chemical environmentsHeavy rolls require mechanical handling and installation planning
CLAD MATERIALS ATLAS PAGE 1 OF 4
TECHNICAL DATA: PERFORMANCE PROPERTIES COM-CLY-MEM-001
Density (Dry) >=4500 g/m2
Water Absorption >600 %
UV Resistance 72 hours
Chemical Resistance Good
pH Tolerance 12 pH range 2-14
Tensile Strength >10.4 kN/m
Shear Strength 24 kPa
Creep Resistance Good
Optical
Light Transmittance 0 %

Modern GCLs evolved from compacted clay liners to factory-manufactured bentonite/geotextile composites. Current practice uses standardized index tests (e.g., ASTM D5887, D5890, D5993) and quality programs to control bentonite performance and liner mass.

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SAFETY, ECOLOGY & INSTALLATION COM-CLY-MEM-001
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COMMERCIAL, LOGISTICS & REGULATORY COM-CLY-MEM-001
Certifications Held
ISO 9001 (quality assurance)CodeMark (product certification)BRANZ NZ (product certification)
Standards Compliance
ASTM D5887 (hydraulic conductivity/index flux)ASTM D5993 (bentonite mass per unit area)ASTM D5890 (swell index)ASTM D5891 (fluid loss)ASTM D4643 (moisture/water absorption)ASTM D6768 (tensile/rupture strength)ASTM D4632 (grab strength)ASTM D6496 (peel strength)ASTM D6243 (internal shear strength)

DISCLAIMER: This specification document is generated from the CLAD Materials Atlas Database. Information is for general guidance only and does not constitute professional engineering advice. Values are typical and may vary by batch, manufacturer, and production run. Verify suitability for specific project applications independently.

ID: COM-CLY-MEM-001 Schema: v3.0
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