Stearalkonium Hectorite

What is Stearalkonium Hectorite?

Stearalkonium hectorite is a synthetic organoclay derived from hectorite, a naturally occurring magnesium-aluminum silicate clay mineral from the smectite group. It undergoes chemical modification by reacting with stearalkonium chloride, a quaternary ammonium compound derived from stearic acid, which renders the clay lipophilic and compatible with oils. Primarily used in anhydrous or oil-phase cosmetic formulations such as foundations, lipsticks, mascaras, antiperspirants, and oil gels, it functions by swelling upon hydration with oils or solvents. This swelling creates a three-dimensional gel network that traps particles, prevents sedimentation, and provides thixotropic properties—meaning the product thins under shear for easy application but thickens at rest for stability. Its rheology-modifying action ensures uniform distribution of pigments, pearls, and actives, enhancing product shelf life and sensory feel without water solubility.

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

Maintains even suspension of pigments and particles in oil-based products, preventing separation.

Forms stable gel structures in anhydrous formulas for improved spreadability and application.

Controls viscosity to deliver smooth, non-dripping textures in makeup and deodorants.

Who It's For

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

Who May Benefit Who Should Avoid
Individuals using pigmented cosmetics like foundations or mascaras for consistent coverage.
Those with known allergies to clay minerals or silicate compounds.
Consumers of oil-serums or balms seeking stable, non-settling formulations.
Individuals sensitive to quaternary ammonium derivatives.
People preferring thick yet spreadable anhydrous products for daily routines.
Users experiencing reactions to similar rheology modifiers in past products.

Safety Notes

  • Assessed as low hazard in cosmetic concentrations by safety reviews.
  • Non-comedogenic, unlikely to clog pores based on ratings.

Frequently Asked Questions about Stearalkonium Hectorite

What does stearalkonium hectorite do in products?

It thickens oils, suspends particles, and stabilizes textures in makeup and anhydrous formulas.

Is it safe for skin?

Rated low hazard in cosmetics, suitable for most users without irritation concerns.

Does it cause breakouts?

Non-comedogenic with a rating of zero, safe for acne-prone skin.