HDL-GCL S37U-050 · TECHNICAL DATA
Kontain HDL-GCL Standard 37 Natural 050
Revision G · 5 November 2026
Standard 37 Natural specifies ≥3,700 g/m² dry bentonite, a woven carrier and bonded 0.50 mm LDPE film.
Cover nonwoven ≥200 g/m²; carrier ≥100 g/m². U identifies natural sodium bentonite without polymer addition. Confirm the full grade code for supply.
Technical data.
Specified minimum or maximum supply requirements; nominal film thickness. Exact-grade manufacturer acceptance and traceable production verification are required. Unmodified-clay indices use ASTM D5890/D5891 within scope. No saline-swell or saline-conductivity value is transferred from polymer grades. Natural sodium origin and absence of polymer require source and batch declarations before supply. The Standard-grade fresh-water index flux limit is adopted from Heavy Duty on a same-bentonite assumption and requires ASTM D5887 verification; construction and confinement also affect hydraulic behaviour.
| 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 | Not included |
| Total carrier | Component minima | ≥100 g/m² |
| Bentonite formulation | Controlled source and formulation | Natural sodium bentonite granules; no polymer addition specified |
| Nominal film thickness / resin | Nominal construction | 0.50 mm LDPE |
| Tensile strength MD / CMD | ASTM D6768 | ≥10 / ≥10 kN/m |
| Internal GCL peel | ASTM D6496 | ≥360 N/m |
| PE to cover peel | Agreed PE/nonwoven method; bonded areas | ≥300 N/m |
| CBR puncture | EN ISO 12236 | ≥1,600 N |
| Hydrated peak internal shear | ASTM D6243 | ≥30 kPa at 10 kPa normal stress |
| Montmorillonite | Quantitative XRD; parent bentonite | >70 wt% |
| Carbonate mineral content | Quantified mineral phases; parent bentonite | <5 wt% |
| Cation exchange capacity | Declared laboratory method | ≥70 meq/100 g |
| Moisture content | ASTM D5993 | ≤13% |
| Fluid loss | ASTM D5891 within scope | ≤18 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 | ≤5.0 × 10⁻¹¹ m/s |
| Fresh-water core index flux q10 | ASTM D5887; assumed from Heavy Duty; verify construction | ≤2.7 × 10⁻⁹ m³/m²/s |
| Released longitudinal film zone | Specified joint detail | 400 mm |
| Direct GCL contact / PE overlap | Separate widths at longitudinal joint | ≥300 / ≥300 mm |
| Extrusion sealing | Actual assembly procedure | Conditional on manufacturing and procedure qualification |
| Wedge welding | Current thin-film range | No |
Download the full TDS for the product construction and supply requirements.
Selection and installation.
Hydraulic values apply to the geotextile-backed GCL core, not the PE film or the completed joint. Confirm confinement, hydraulic gradient, hydration sequence, permeant composition and equilibrium criteria in the order test schedule. The AS catalogue lists D5887 beside conductivity; D5887 measures index flux. Report conductivity using D5084 with an agreed GCL setup; use D6766 within scope for chemical permeation and identify any adaptations. Assess the film-backed assembly separately. Peak internal shear is not a residual design strength. Review actual subgrade, contact-liquid chemistry and confinement. The 0.50 mm option requires manufacturing qualification; extrusion sealing also requires a qualified procedure. No wedge welding. The commercial carbonate limit does not establish landfill-specification compliance. Unmodified bentonite is available for projects where typical low-salinity rainwater or compatible subgrade moisture hydrates the clay, subject to the project chemistry, confinement and hydraulic requirements. Consider polymer modification where higher resistance to drying and desiccation cracking is sought during extended exposure before covering, or where lime-affected water, highly saline water or certain leachates may hydrate the bentonite instead of typical rainwater. Select and verify the polymer formulation against the actual hydration liquid, pH, dissolved ions, confinement and exposure conditions. Polymer modification does not automatically qualify lime-treated fill or aggressive liquids. Cover promptly; permanent exposed service requires a separate design.
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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