Product distinction
DNW3700-GL is not DNW40-AU/GP2 with a shortened name. It has a lower dry bentonite minimum and a different peel requirement.
.png){kind=logo}
GCL TECHNICAL DATAMANUFACTURING ROUTECETCO® / Minerals Technologies Inc.
AUSTRALIAN ROUTEKontain technical sales, quoting + project support
TECHNICAL DATA SHEET · AUSTRALIAN FORMAT
BENTOMAT® DNW3700-GL
Australian scrim-reinforced double-nonwoven GCL
An Australian-market reinforced GCL with sodium bentonite between a scrim-reinforced nonwoven carrier and nonwoven cap, with additional published bentonite mineralogy and cation-exchange controls.
Kontain position
A lower-bentonite-mass DNW pathway where interface friction and dimensional stability are useful and the project accepts the stated 3.70 kg/m² dry bentonite minimum.
FORMATAustralian SI units
SOURCECETCO Australian TDS, November 2025
STATUSKontain technical summary
ISSUED24 July 2026
PUBLISHED PERFORMANCE
Metric values, with the test conditions visible.
Values below are presented in Australian engineering units. CETCO’s published ASTM methods are retained; the units have changed, not the underlying test method or acceptance basis.
Dry bentonite≥ 3.70 kg/m²
Index flux≤ 1.0 × 10⁻⁸ m³/m²/s
Peel strength> 400 N/m
CEC≥ 70 meq/100 g
| Property | Published / specified value | Test method | MQC / published frequency |
|---|---|---|---|
| Index flux | ≤ 1.0 × 10⁻⁸ m³/m²/s | ASTM D5887 | 1 per 25,000 m² |
| Hydraulic conductivity | ≤ 5.0 × 10⁻¹¹ m/s | ASTM D5887 | 1 per 25,000 m² |
| Dry total mass per unit area | ≥ 4.10 kg/m² | ASTM D5993 | 1 per 4,000 m² |
| Dry bentonite mass per unit area | ≥ 3.70 kg/m² | ASTM D5993 | 1 per 4,000 m² |
| GCL moisture content | ≤ 35% | ASTM D5993 | 1 per 4,000 m² |
| Tensile strength - machine direction | ≥ 4.0 kN/m | ASTM D6768 | 1 per 20,000 m² |
| Peel strength | > 400 N/m | ASTM D6496 | 1 per 4,000 m² |
| GCL flux at 35 kPa0.05 M CaCl₂ after DI-water hydration | ≤ 1.0 × 10⁻⁷ m³/m²/s | ASTM D6766 / GRI-GCL3 §5.6.1 | Yearly |
| Bentonite swell index | ≥ 24 mL/2 g | ASTM D5890 | 1 per 50 tonnes |
| Bentonite fluid loss | ≤ 18 mL | ASTM D5891 | 1 per 50 tonnes |
| Montmorillonite content | > 70% | XRD | 1 per batch |
| Calcite content | < 1-2% | XRD | 1 per batch |
| Cation exchange capacity | ≥ 70 meq/100 g | TP-1016 | 1 per 50 tonnes |
| Nonwoven cap mass | ≥ 200 g/m² | ASTM D5261 | 1 per 20,000 m² |
| Nonwoven composite carrier mass | ≥ 200 g/m² | ASTM D5261 | 1 per 20,000 m² |
| Geotextile durability | ≥ 65% tensile retained | GRI-GCL3 §5.6.2 | Yearly |
| Typical roll | 5.0 m × 40.0 m | Manufacturer declaration | Continuous |
* Published typical peak value after hydration at approximately 9.6 kPa normal stress; not a minimum design envelope. † Published RESISTEX U20 ST maximum in deionised water and 0.02 M CaCl₂. Current factory certificates and project specifications govern.
DESIGN TRANSPARENCY
What still needs to be verified.
A compliant index value does not remove project-specific hydraulic, stability or installation risk.
Bentonite diagnostics
The supplied TDS adds montmorillonite, calcite and CEC values. These improve source transparency but do not replace representative-liquid hydraulic testing.
Stability gate
Confirm internal and interface shear at the project normal stresses and hydration condition. Backing type alone does not establish a design angle.
SUPPLY + CUSTOMISATION
Quote the configuration the project actually needs.
Approximately 209 m² gross and 200 m² effective after standard overlaps. Confirm current factory dimensions, mass and origin for every order.
A budgeting assumption only. Final payload and pack plan require CETCO confirmation. Full production and freight lots generally support the strongest landed rate.
Alternative reinforcement and RESISTEX formulations can be evaluated where slope demand, adjoining interfaces or site liquid require a different configuration.
SOURCE + CONTROL
Kontain presentation. CETCO source data.
This webpage is a Kontain-prepared Australian presentation of CETCO published data. It is not a manufacturer reissue and should not be used to override a current CETCO TDS, certificate of analysis, project specification or engineering assessment.