Kontain GCL-W · welded composite liner
A 0.75 mm or 1.00 mm GM17 LLDPE membrane laminated to a granular sodium bentonite GCL. Join the free membrane margins by hot-wedge or extrusion welding to form the membrane seam.
A separate weldable range
GCL-W S37U-075
Membrane specified to GRI-GM17 Revision 17. Standard GCL construction with ≥3,700 g/m² dry granular sodium bentonite, ≥200 g/m² cover nonwoven and ≥100 g/m² woven carrier.
No bentonite polymer dosing and no additional bottom nonwoven. Includes protected factory weld margins for wedge or extrusion welding.
Enquire about GCL-W S37U-075 →GCL-W S37U-100
Membrane specified to GRI-GM17 Revision 17. Standard GCL construction with ≥3,700 g/m² dry granular sodium bentonite, ≥200 g/m² cover nonwoven and ≥100 g/m² woven carrier.
No bentonite polymer dosing and no additional bottom nonwoven. Includes protected factory weld margins for wedge or extrusion welding.
Enquire about GCL-W S37U-100 →Values are specified supply requirements, not batch test results or statistically established MARV. The GM17 schedule applies to the smooth black LLDPE membrane component. GCL-core, lamination and installed-seam properties are declared separately.
| Property | Test method or basis | Unit | Requirement |
|---|---|---|---|
| Bentonite | Source and formulation declaration | — | Granular sodium bentonite |
| Bentonite polymer dosing | Formulation declaration | — | None |
| Dry bentonite mass at 0% moisture | ASTM D5993 plus records | g/m² | ≥3,700 |
| Cover nonwoven polypropylene | ASTM D5261 | g/m² | ≥200 |
| Carrier woven polypropylene | ASTM D5261 | g/m² | ≥100 |
| Additional carrier nonwoven | Construction declaration | — | Not included |
| Swell in reagent water | ASTM D5890 | mL/2 g | ≥24 |
| Fluid loss | ASTM D5891 | mL | ≤18 |
| Moisture content | ASTM D5993 | % | ≤13 |
| GCL tensile strength MD / CMD | ASTM D6768 | kN/m | ≥10 / ≥10 |
| Internal GCL peel | ASTM D6496 | N/m | ≥360 |
| GCL static puncture CBR | EN ISO 12236 | N | ≥1,600 |
| Hydrated peak internal shear at 10 kPa normal stress | ASTM D6243 | kPa | ≥30 |
| PE to cover peel in bonded field | Agreed PE/nonwoven procedure | N/m | ≥300 |
| Core freshwater hydraulic conductivity | ASTM D5084 GCL setup | m/s | ≤5 × 10⁻¹¹ |
| Core freshwater index flux q10 | ASTM D5887 | m³/(m²·s) | ≤2.7 × 10⁻⁹ |
Dry bentonite mass excludes geotextiles, adhesive and membrane. Both grades use the Standard 37 GCL construction with sodium bentonite granules, no bentonite polymer dosing and no additional bottom nonwoven.
GCL hydraulic values apply to the clay core, excluding the LLDPE and joints. Specify hydration liquid, confinement, gradient and equilibrium criteria. The Standard-grade index-flux requirement needs construction-specific verification; chemical compatibility requires representative liquids and ASTM D6766 within scope.
GCL CBR puncture, membrane index puncture, internal GCL peel and laminate peel are separate tests. Peak shear is not a residual or interface design value. Supply roll dimensions, mass, core and edge configuration are order-specific.
Smooth black LLDPE
| Membrane property | Method | Unit | 0.75 mm | 1.00 mm | Minimum MQC |
|---|---|---|---|---|---|
| Minimum average thickness | D5199 | mm | ≥0.75 | ≥1.00 | Each roll |
| Lowest of ten thickness readings | D5199 | mm | ≥0.675 | ≥0.900 | Each roll |
| Formulated sheet density | D1505 / D792 | g/cm³ | ≤0.939 | ≤0.939 | 90,000 kg |
| Break strength MD / CMD | D6693 Type IV | kN/m | ≥20 | ≥27 | 9,000 kg |
| Break elongation MD / CMD | D6693 Type IV | % | ≥800 | ≥800 | 9,000 kg |
| 2% secant modulus | D5323 | MPa | ≤414 | ≤414 | Each formulation |
| Tear resistance | D1004 | N | ≥70 | ≥100 | 20,000 kg |
| Membrane index puncture | D4833 | N | ≥190 | ≥250 | 20,000 kg |
| Axisymmetric break strain | D5617 | % | ≥30 | ≥30 | Each formulation |
| Carbon black content | D4218 | % | 2.0–3.0 | 2.0–3.0 | 20,000 kg |
| Carbon black dispersion | D5596 | — | 9 of 10 views Category 1 or 2; ≤1 Category 3 | Same | 20,000 kg |
| Initial standard OIT OR | D8117 | min | ≥100 | ≥100 | 90,000 kg |
| Initial high-pressure OIT | D5885 | min | ≥400 | ≥400 | 90,000 kg |
| 90-day oven ageing at 85°C: retained standard OIT OR | D5721 + D8117 | % | ≥35 | ≥35 | Each formulation |
| 90-day oven ageing at 85°C: retained HP-OIT | D5721 + D5885 | % | ≥60 | ≥60 | Each formulation |
| 1,600-hour UV: retained HP-OIT | D7238 + D5885 | % | ≥35 | ≥35 | Each formulation |
Basis: GRI-GM17 Revision 17, 11 June 2025, smooth black LLDPE Table 1(b). Values follow the stated minimum averages, maxima or ranges; GM17 does not define these as MARV or MaxARV. Tensile averages use five specimens in each direction; break elongation uses a 50 mm gauge length and 50 mm/min.
Use either listed initial OIT route and either listed oven-ageing retention route. Standard OIT is not the UV acceptance route. UV exposure uses 20 hours at 75°C followed by 4 hours condensation at 60°C; HP-OIT retention is assessed relative to its initial value. Intermediate oven checks at 30 and 60 days are recommended.
Virgin resin with no more than 10% same or approved-formulation rework; no post-consumer resin. Alternative carbon-black methods D1603 or D6370 need correlation with D4218. ASTM prefixes apply to all methods. Incoming-sheet MQC and post-lamination checks must establish that processing preserves the specified membrane properties.
GRI-GM17 Revision 17 reference ↗Factory-released membrane margins keep clay, textiles and adhesive clear of the weld path. Retain direct GCL contact beneath the welded membrane joint. Use the issued detail for end laps, cut edges, penetrations and repairs.
| Seam property | Method | Unit | 0.75 mm | 1.00 mm |
|---|---|---|---|---|
| Hot-wedge shear strength | ASTM D6392 | N/25 mm | ≥197 | ≥263 |
| Hot-wedge peel strength | ASTM D6392 | N/25 mm | ≥166 | ≥219 |
| Extrusion-fillet shear strength | ASTM D6392 | N/25 mm | ≥197 | ≥263 |
| Extrusion-fillet peel strength | ASTM D6392 | N/25 mm | ≥150 | ≥190 |
| Laboratory shear elongation, both methods | ASTM D6392 | % | ≥50 | ≥50 |
| Maximum peel separation, both methods | ASTM D6392 | % | ≤25 | ≤25 |
Seam requirements follow the GM17 Revision 17 appendix, Table 3(b). Require compliant strength and acceptable ductile break behaviour; all five shear specimens must meet the strength and laboratory elongation requirements, and all five specimens must show acceptable break patterns. Test both tracks of a dual-track weld. Field elongation measurements are omitted under the appendix.
Wedge welding forms primary seams; extrusion fillet welding forms compatible details, repairs and connections. Qualify the actual membrane, filler, machine and laminated assembly with site trial welds. Use non-destructive testing compatible with the seam geometry and destructive testing at the project CQA frequency. Seam compliance is the installer's responsibility.
Included weld-zone protection
EdgeProtect™ removable film strips protect the designated mating LLDPE weld faces. Bentonite dust can contaminate a seam and impair fusion, so keep the strips in place during handling and deployment.
Assess subgrade protection, hydration, contact chemistry, cover loading and hydrated internal/interface shear for the complete lining system. No added bottom nonwoven or bentonite polymer treatment is included. EdgeProtect™ reduces contamination exposure; it does not replace cleaning, trial welds or CQA. GM17 membrane requirements do not establish whole-system landfill compliance or an exposed service life.
Technical resources · 1 file
A separate TDS for GCL-W S37U-075 and S37U-100. The thin-film HDL-GCL schedules cover different products.
Send the area, subgrade, hydration water and contained-liquid chemistry, slopes, cover or exposed-service requirements, penetrations, joint details and delivery location. Roll dimensions and handling provisions are specified for the order.
