Chemistry gate
The published hydraulic value is an index result. Verify the actual contact liquid, hydration source, salinity, divalent ions and pH before final selection.
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GCL TECHNICAL DATAMANUFACTURING ROUTECETCO® / Minerals Technologies Inc.
AUSTRALIAN ROUTEProposed preferred technical distributor
TECHNICAL DATA SHEET · AUSTRALIAN FORMAT
BENTOMAT® ST
Reinforced sodium-bentonite GCL
A layer of natural sodium bentonite encapsulated between woven and nonwoven polypropylene geotextiles and reinforced by needlepunching.
Kontain position
A baseline option for composite liners and relatively non-aggressive contact liquids, subject to hydration, chemistry and stability verification.
FORMATAustralian SI units
SOURCECETCO North American TDS, 2020 v2
STATUSPreliminary product comparison
ISSUED17 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≥ 3.6 kg/m²
Hydraulic conductivity≤ 5 × 10⁻¹¹ m/s
Grab strength≥ 5.3 kN/m
Published internal shear24 kPa typical peak*
| Property | Published / specified value | Test method | MQC / published frequency |
|---|---|---|---|
| Bentonite swell index | ≥ 24 mL/2 g | ASTM D5890 | 1 per 50 tonnes |
| Bentonite fluid loss | ≤ 18 mL | ASTM D5891 | 1 per 50 tonnes |
| Dry bentonite mass per unit area | ≥ 3.6 kg/m² | ASTM D5993 | 1 per 4,000 m² |
| GCL grab strengthMARV | ≥ 5.3 kN/m | ASTM D6768 | 1 per 20,000 m² |
| Peel strengthMinimum | ≥ 0.61 kN/m | ASTM D6496 | 1 per 4,000 m² |
| Index fluxMaximum | ≤ 1 × 10⁻⁸ m³/m²/s | ASTM D5887 | Weekly |
| Hydraulic conductivityMaximum | ≤ 5 × 10⁻¹¹ m/s | ASTM D5887 | Weekly |
| Hydrated internal shearAt 9.6 kPa normal stress | 24 kPa typical peak* | ASTM D6243 / D5321 | Periodic |
* 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.
Stability gate
The published internal shear value is not a design envelope. Test the GCL and adjacent interfaces at project normal stresses, hydration and displacement conditions.
Installation gate
Subgrade preparation, overlaps, penetrations, weather exposure, cover placement and confinement remain part of the barrier performance.
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.