Bentonite contains a hydrated aluminium silicate clay mineral responsible for its sealing and lubrication properties. Natural bentonite is classified by the predominant balancing cation, normally sodium or calcium.

All applications of bentonite rely on its reaction with water. Sibelco’s sodium bentonite bonding properties occur in the early stage of water absorption approximating its plastic limit of 50% to 70%. When mixed at low concentration in water, our sodium bentonite exhibits a stable thinning behavior. Bentonite is used in agriculture, building and construction, civil engineering, drilling and foundry.