GCL H37U · TECHNICAL DATA
Kontain GCL Heavy Duty 37 Granular
Revision D · 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 sodium bentonite granules without polymer addition.
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. ASTM D5890: reagent water (distilled/deionised), at least 16 h after the final increment; extend/report as the method requires. Sodium bentonite identity and no polymer addition require source and batch declarations. Saline swell and saline conductivity are not declared.
| 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 | Sodium bentonite granules; no polymer addition specified |
| 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 |
| Moisture content | ASTM D5993 | ≤13% |
| Fluid loss | ASTM D5891 within scope | ≤16 mL |
| Unmodified swell in reagent water | ASTM D5890; minimum 16 h after final increment | ≥24 mL/2 g |
| Core conductivity in fresh water | D5084 with agreed GCL setup | ≤3.0 × 10⁻¹¹ 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. Select for compatible low-salinity rainwater or subgrade moisture. Consider the polymer grade for greater drying resistance or aggressive hydration liquids, with formulation-specific testing. 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.
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