Bentonite is a native hydrated colloidal aluminum silicate clay. It is an absorbent swelling clay consisting mostly of montmorillonite. It has various applications from use in drilling mud to binder, purifier, absorbent, and carrier for fertilizers or pesticides. Minor uses include filler, sealant, and catalyst in petroleum refining.


FormsGrey, White, Powder (fine)

Uses and Applications

Key applications

  • Printing & Inks
  • Coatings
  • Binding agent
  • Cosmetic products
  • Soaps and detergents
  • Paint and Coatings


  • Coatings & Construction
  • Cosmetics

Synonyms: Bentonite, Bentonite Clay, Montmorillonite, Silicate of Alumina, Smectite Clay, Sodium Activated Bentonite, Sodium Montmorillonite, Wilkinite

CAS Number: 1302-78-9