.Usage: 
I- Drilling:
The conventional use of Bentonite is as a mud constituent for oil and water well drilling.
Its roles are mainly to seal the borehole walls, to remove drill cuttings and to lubricate the cutting head.
II- Foundry: 
Bentonite is used as a bonding material in the preparation of molding sand for the production of iron, steel and non-ferrous casting. The unique properties of Bentonite yield green sand moulds with good flowability, compactability and thermal stability for the production of high quality castings.www.sinofrica.com