Bentonite's Kaleidoscope of Applications.

Bentonite clay is much-used in the metalcasting industry as a bonding agent in green sand molds. Its unique ability to absorb seven to 10 times its own weight in water makes it economical for green sand molding, but metalcasting is not the only industry that relies on this thirsty clay found throughout the western U.S.

When American pioneers first began trekking westward, they ran across the bentonite clay as it stuck to their wagon wheels. The resourceful pioneers turned a nuisance into a solution after discovering the moistened clay acted as a good lubricant for squeaky wheels. Bentonite also was used as a sealant for log cabin roofing, and Native Americans are said to have used the clay as soap.

New uses for bentonite continued to crop up as new industries were created in the U.S. Major markets for bentonite today include the metalcasting industry and well drilling, but its use stretches across a gamut of applications.

Recently, bentonite has become a major component of everyday cat litter because of its water absorption, swelling and odor controlling characteristics. The clay also is used as a binder for palletizing animal and poultry feeds. Additionally, it is used in landfills and slurry walls, iron ore palletizing and papermaking, cosmetics and wine clarification. With bentonite's wide range of uses, it's no wonder metalcasting--the manufacturing process with 10,000 applications--is a major customer.