BETONITE is an absorbent swelling clay consisting mostly of montmorillonite. As a swelling clay, bentonite has the ability to absorb large quantities of water. The montmorillonite making up bentonite is an aluminum ,phyllosilicate mineral, which takes the form of microscopic platy grains. These give the clay a very large total surface area, making bentonite a valuable adsorbent. The plates also adhere to each other when wet. This gives the clay a cohesiveness that makes it useful as a binder and as an additive to cement grout to increase water bearing capacity.

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