GCL H37P · TECHNICAL DATA
Kontain GCL Heavy Duty 37 Polymer
Revision C · 5 November 2026
Heavy Duty 37 specifies ≥3,700 g/m² dry bentonite, a 300 g/m² composite carrier (100 woven plus 200 nonwoven) and polymer-modified sodium bentonite powder.
Needle-punched GCL without a PE laminate. Cover nonwoven ≥200 g/m². Carrier composite ≥300 g/m²: woven ≥100 and nonwoven ≥200 g/m².
Technical data.
Exact-grade manufacturer acceptance and traceable production verification are required. Specified lower and upper supply limits, not MARV. Dry bentonite excludes polymer and geotextiles; verify the clay fraction. Confirm each unlaminated construction; added clay mass does not establish higher performance. Modified swell: 16 h after the final increment in ASTM D1193 reagent water (distilled/deionised) or 20,000 mg/L NaCl. Supplier ≥28/≥22 values used tap/unspecified salt water; defined conditions need confirmation. ASTM D5890-25 excludes polymers. Agree fluid-loss preparation.
| Property | Method / basis | Value |
|---|---|---|
| Dry bentonite mass | ASTM D5993 plus formulation records | ≥3,700 g/m² excluding polymer |
| Cover nonwoven | ASTM D5261 | ≥200 g/m² |
| Carrier woven | ASTM D5261 | ≥100 g/m² |
| Carrier nonwoven | ASTM D5261 | ≥200 g/m² |
| Total carrier | Component minima | ≥300 g/m² |
| Bentonite formulation | Controlled source and formulation | Polymer-modified sodium bentonite powder |
| Tensile strength MD / CMD | ASTM D6768 | ≥10 / ≥10 kN/m |
| Internal GCL peel | ASTM D6496 | ≥360 N/m |
| CBR puncture | EN ISO 12236 | ≥2,500 N |
| Hydrated peak internal shear | ASTM D6243 | ≥35 kPa at 10 kPa normal stress |
| Powder grading | Validated particle-size method | ≥80% passing 75 µm |
| Moisture content | ASTM D5993 | ≤13% |
| Fluid loss | D5891-based modified-blend procedure | ≤18 mL |
| Modified swell in reagent water | ASTM D5890-based modified method; 16 h after final increment | ≥28 mL/2 g |
| Modified swell in saline liquid | ASTM D5890-based modified method; 16 h after final increment; 20,000 mg/L NaCl | ≥22 mL/2 g |
| Core conductivity in fresh water | D5084 with agreed GCL setup | ≤3.0 × 10⁻¹¹ m/s |
| Core conductivity in 20,000 mg/L NaCl | D6766 within scope; identify adaptations | ≤1.0 × 10⁻¹⁰ m/s |
| Fresh-water core index flux q10 | ASTM D5887; verify construction | ≤2.7 × 10⁻⁹ m³/m²/s |
| Factory longitudinal edge overlap | Accepted seam detail | ≥300 mm |
| End joints and field cuts on a base | Accessory bentonite treatment | ≥600 mm |
| Roll width and length | Common supply format | 5 × 30 m |
Download the full TDS for the product construction and supply requirements.
Selection and installation.
Hydraulic limits apply to the GCL under agreed confinement, gradient, hydration, liquid and equilibrium criteria. Assess joint performance separately. Use ASTM D6766 within scope for chemicals and report adaptations. Durability, cycling and protection qualification remains pending. This sheet does not establish landfill-specification compliance. Consider polymer where higher drying resistance is sought during prolonged exposure, or lime-affected water, highly saline water or certain leachates may hydrate the clay instead of typical rainwater. Verify the actual liquid and formulation. Cover promptly; permanent exposed service requires separate design. Keep overlaps clean and in direct GCL contact under continuous confinement. Confirm factory edge treatment; use compatible accessory bentonite on untreated seams, ends and cuts. Slope end joints and repairs require project details. Agree roll dimensions and cores for the order.
Common rolls are 5 m × 30 m (150 m² gross). Custom dimensions, bentonite masses and plastic or steel cores are available by order. Confirm gross roll mass and clear core bore before lifting.
Provide the liner section, contact-soil grading and chemistry, liquid analysis, slope, loading, installation method and delivery requirements.
Read the installation guidance →