Sodium bentonite powder
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Bentonite Clay 25kg bags

Sodium Bentonite clay available in 25kg bags. This is a civil engineering grade product, made in Australia.

For volume purchases we sell per pallet (48 bags), see volume pricing table. Also available are bulk bags (geotextile 1200kg), these require a 2-3 week lead time.

Quantity Unit discount You Save
24 15% $155.95
48 24% $499.05
96 28% $1,164.44


$39.38 GST excluded

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In addition to the sealing of natural dams, sodium bentonite is often specified for applications including as a seal in the base of root barrier.

When using bentonite as a base for root barrier using a mixing ratio of 1:15 (bentonite to soil) for good quality soil or 1:10 ratio for poorer earth. Bascially you will need approximately 5kg per 10m of root barrier, allowing for a 50mm depth x 100mm width of bentonite/ soil mix.

If you are using bentonite clay for earth dams a common mix is 20kg soil to 1kg bentonite.

Data sheet
Primary Applications
barrier against root systems, dam lining
Unit of Measure
bentonite clay


Applications include: root barrier as a growth inhibitor, drilling fluids, grouting for tunneling applications, low permeability slurry mixes, ground stabilization, dam sealing and waste containment.

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