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Bentonite is a moisture retaining clay used as an earth electrode back-fill to help lower soil resistivity. The clay is a sodium activated montmorillonite, which when mixed with water swells to many times its original volume. Bentonite can be supplied in granular or powder form. The granular form is easier to handle as the powder can cause dust in windy conditions. Granular is the preferred option for filling trenches as the substance can be mixed in the trench. Powder is the preferred option for pouring into bore holes to ensure the mixture is a thin enough consistency to reach the bottom of the hole. The typical expansion ratio when mixed with water is 2:1.

Type Unit Weight kg Pack Quantity Part Number
Bentonite Granular Form 25  1 Bag  EBG 25
Bentonite Powder Form EBG 26
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