HDL-GCL 020 · TECHNICAL DATA
Kontain Heavy Duty Laminated GCL 020
Revision H · 3 November 2026
Kontain HDL-GCL combines a bonded polyethylene surface with a reinforced, needle-punched clay liner. Both grades use natural sodium bentonite powder with polymer modification, held between a nonwoven cover and a woven/nonwoven composite carrier.
0.20 mm LDPE film; specified dry bentonite mass ≥4,000 g/m² excluding polymer and PE-to-nonwoven peel ≥300 N/m in bonded areas.
Technical data.
GCL reference properties are not certified test results for the finished powder/polymer laminate. Construction quantities and laminate peel are specified requirements. Confirm the order specification and test evidence for project acceptance. Applicable GCL test methods follow GRI-GCL3 Revision 5 (21 November 2019); this is not a claim of GRI-GCL3 compliance. The PE-to-nonwoven peel requirement applies to bonded areas, excluding loose edge zones. ASTM D5890 applies to the unmodified natural sodium bentonite; modified-bentonite swell values are separate specified requirements.
| Property | Method / basis | Value |
|---|---|---|
| Nominal PE film thickness | 0.20 mm | |
| PE resin | LDPE | |
| Bentonite core | Natural sodium powder with polymer | |
| Dry bentonite mass | ≥4,000 g/m², excluding polymer | |
| PP nonwoven cover | ASTM D5261 | 210 g/m² |
| PP composite carrier | ASTM D5261 | 120 woven + 200 nonwoven = 320 g/m² |
| GCL bonding | Fully needle-punched | |
| PE-to-nonwoven peel | ASTM D6496 (adapted for PE/nonwoven) | ≥300 N/m |
| Unmodified natural sodium bentonite swell | ASTM D5890; reagent water | ≥24 mL/2 g |
| Polymer-modified natural sodium bentonite swell | >28 mL/2 g | |
| Polymer-modified natural sodium bentonite swell in saline fluid | >22 mL/2 g in 20,000 ppm salt water | |
| GCL tensile test, machine direction | ASTM D6768 | Method reference only |
| GCL peel strength | ASTM D6496 | 360 N/m |
| CBR puncture strength | EN ISO 12236 | ≥2,500 N |
| GCL hydraulic conductivity | ASTM D5084 | ≤3 × 10⁻¹¹ m/s |
| GCL index flux q10 | ASTM D5887 | ≤2.7 × 10⁻⁹ m³/m²/s |
| Hydrated internal peak shear | ASTM D6243 | ≥35 kPa at 10 kPa normal stress |
| Released longitudinal film zone | 400 mm | |
| PE overlap | 300 mm | |
| Extrusion sealing | No | |
| Wedge welding | No |
Download the full TDS for the product construction and supply requirements.
Selection and installation.
The ASTM D5084 conductivity, EN ISO 12236 puncture, ASTM D6243 shear and adapted PE/nonwoven peel properties are supplementary to GRI-GCL3 Table 1. GCL3 hydraulic criteria for geotextile-related GCLs are not whole-laminate criteria. Peak shear is not a design residual strength. The PE film is specified by resin type and nominal thickness; GM13/GM17 compliance is not claimed. Use a project-approved detail for end laps and repairs that maintains direct GCL contact and PE coverage. Do not strip bonded film. Extrusion sealing is limited to HDL-GCL 050. Use a qualified procedure for the 0.50 mm LLDPE film, filler and laminated assembly. Do not extrusion-seal HDL-GCL 020. Neither grade is wedge weldable. Unsealed PE overlaps rely on the GCL joint beneath them; the film overlap alone is not a watertight seam.
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 →