NaturalGel® is an unpeptized bentonite (sodium montmorillonite). NaturalGel has the unusual property of expanding several times its original volume when placed in water. The result is higher fluid viscosity, gel strength, and solids-suspending ability. Bentonite can be added up to 20% by volume by weight of cement. Above 6%, the addition of a dispersant is usually necessary to reduce the slurry viscosity and gel strength.