Stearalkonium Bentonite

What is Stearalkonium Bentonite?

Stearalkonium Bentonite is a lipophilic organoclay derived from natural bentonite, a smectite mineral rich in montmorillonite platelets. It undergoes chemical modification with stearalkonium chloride, a cationic surfactant from stearic acid, to become oil-dispersible rather than hydrophilic. This alteration allows the platelets to swell and form a card-house structure in non-polar solvents like oils and hydrocarbons. Primarily featured in anhydrous cosmetics such as nail enamels, pigmented makeup, lip products, and oil cleansers, it acts as a rheology modifier. By creating a reversible gel network, it suspends insoluble solids like pigments and glitter, inhibits settling during storage, and delivers controlled flow for precise application and even wear.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Suspending agent
Keeps insoluble particles (pigments, beads, actives) evenly dispersed by increasing viscosity or forming a network, preventing settling and separation.
Gel forming
Builds a gel network to increase viscosity and structure, improving suspension, spread, and stability in serums, gels, and some emulsions.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Benefits

Stabilizes formulations by evenly suspending pigments and particles.

Creates desirable gel-like textures in oil-based products for smooth spreading.

Enhances shelf-life through viscosity control and phase separation prevention.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Users of nail polish and color cosmetics seeking even coverage.
Those with rare allergies to bentonite clays.
Individuals with oil-based skincare routines for stable textures.
People sensitive to quaternary ammonium compounds.
People wanting long-lasting, non-settling makeup products.
Users focused on water-only formulations where it offers no function.

Safety Notes

  • Recognized as safe for cosmetic use with low overall hazard.
  • Non-comedogenic and unlikely to contribute to pore blockages.

Frequently Asked Questions about Stearalkonium Bentonite

What makes Stearalkonium Bentonite unique?

Its oil-swelling platelets form gels in anhydrous products, suspending particles effectively.

Is it suitable for sensitive skin?

Generally low irritation risk, safe in typical cosmetic concentrations.

Where is it commonly used?

In nail polishes, lip products, and oil-based makeup for stability.