CETCO Third party certifications:
  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type

  • QA Certificate

    QA Certificate

    Certificate type

A bentonite geotextile waterproofing system for below ground vertical and horizontal structural foundation surfaces, and for sheet piling and property line applications.

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VOLTEX is a highly effective waterproofing composite of high strength geotextile and 4.8 kg of sodium bentonite per m².

The high swelling bentonite is encapsulated between a non-woven and woven geotextile. A patented needle-punch process interlocks the geotextiles to form an extremely strong composite. Once backfilled, VOLTEX hydrates to form a monolithic waterproof membrane.

VOLTEX is designed for below ground vertical and horizontal structural foundation surfaces. Typical applications include backfilled concrete walls, earth covered roofs, structural slabs and tunnels and property line construction. Property line construction includes secant and contiguous piling, skin wall, metal sheet piling, shotcrete and stabilized earth retention walls. VOLTEX contains zero VOC and can be installed in most weather conditions.

For contaminated water or salt-water conditions, VOLTEX is available with a contaminant resistant Volclay sodium bentonite – VOLTEX CR. Consult manufacturer for details.

Fixing to vertical/ sloping surfaces:

CETCO soft washer fasteners.

Joint laps:

Side and end laps minimum 100 mm are recommended; end joints staggered.

General information

Uniclass 2015

Pr_15_57_27_39 Geosynthetic clay liners (GCLs)Primary


J40/285 Loose laid bentonite damp proofing/ tanking

Specification data - Geosynthetic clay liners (GCLs)

Product Reference



Not required

BENTOSEAL trowel grade sodium bentonite compound

For detailing around penetrations and corner transitions.

VOLCLAY granules

Granular Volclay bentonite used for detailing critical areas.


Standard product features


Not required.

Joint sealing:

Staple or nail pins.

Water permeability:

1 x 10e-9 cm/sec.

Hydrostatic pressure resistance:

70 m.

Bentonite mass per m²:

4.88 kg.

Third party certifications

Additional certifications:

  • Hygienic Certificate: HK/W/0986/01/2014
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