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Bentonite waterstop is a type coming under the hydrophilic waterstop category. Bentonite, as we know is a swellable clay compound. It has the property to expand sixteen times when it comes in contact with the water. 

This filling property is used to seal the concrete joints. This waterstop actually compression seal the system thus filling the cracks and the voids in the concrete. 

One of the challenges in installing this system is that the bentonite must be maintained dry until it is poured into the joint which has to be sealed. Premature exposure of the bentonite to moisture results in the damage of the joints and weakening of the concrete around the joint.