Sodium bentonite is a natural clay formed from ancient volcanic ash. It acts like a highly absorbent sponge: its tiny layers absorb water, expand, and form a thick gel.
Its swelling ability makes it useful for:
Drilling wells: Creates drilling mud that lubricates equipment, carries rock chips out, and helps keep the hole stable.
Sealing ponds and canals: Forms a barrier that reduces water leakage.
Landfill lining: Helps prevent contaminated liquids from seeping into the ground.
Metal casting: Binds sand into molds that hold their shape during casting.
Other uses: Helps make iron-ore pellets and seals for holes and waterproofing applications.
Sodium bentonite’s main strengths are swelling, sealing, thickening, and binding.