Quaternium-90 Bentonite

What is Quaternium-90 Bentonite?

Quaternium-90 Bentonite is a chemically modified form of bentonite, a natural aluminum silicate clay mined from volcanic ash deposits. It undergoes cation exchange with quaternium-90, a quaternary ammonium salt, to become organophilic and swell in oils rather than water. Primarily used in anhydrous or oil-based cosmetics like foundations, mascaras, lip products, and deodorants, it functions as a rheology control agent. When mixed into oily phases, the particles hydrate, expand, and interconnect into a reversible gel matrix. This structure suspends insoluble components such as pigments or mica evenly, prevents sedimentation during storage, and delivers a creamy, spreadable consistency that enhances blendability and 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.
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 distribution of pigments and particles for consistent product performance.

Adjusts thickness to improve texture, spreadability, and stability in oil-based formulas.

Supports non-settling formulations, ideal for long-lasting 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
Users of color cosmetics needing stable, clump-free application.
Those with rare allergies to bentonite clays.
Individuals preferring oil-based products with smooth, controlled viscosity.
People sensitive to quaternary ammonium compounds.
People seeking non-comedogenic thickeners in makeup or antiperspirants.
Individuals preferring water-based or clay-free formulations.

Safety Notes

  • Considered low hazard in cosmetic use concentrations.
  • Non-comedogenic with minimal risk of pore clogging.

Frequently Asked Questions about Quaternium-90 Bentonite

What makes Quaternium-90 Bentonite unique?

Its quaternium modification allows swelling in oils, unlike standard bentonite, for use in makeup and deodorants.

Is it safe for daily cosmetic use?

Safety reviews affirm low hazard at typical levels, with no significant concerns.

Does it clog pores?

Rated non-comedogenic, making it suitable for various skin types.