Quaternium-18 Bentonite

What is Quaternium-18 Bentonite?

Quaternium-18 Bentonite consists of natural bentonite clay, derived from volcanic ash deposits rich in montmorillonite, treated with quaternium-18—a quaternary ammonium cation—to create an organophilic thickener. This chemical modification disperses easily in oils and emulsions, unlike untreated clays. Primarily used in makeup, sunscreens, shampoos, and conditioners, it functions by swelling in solvents to form reversible networks that trap particles, preventing sedimentation while allowing shear-thinning for easy flow during use. Its thixotropic properties ensure consistent texture, enhance stability against phase separation, and improve user experience through smooth dispensing and even coverage in diverse formats like creams, lotions, and gels.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 2 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 actives for consistent product performance.

Enhances thickness for better stability and appealing sensory qualities.

Supports non-comedogenic formulas suitable for various skin types.

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 suspension-based products like foundations or lotions.
Those with rare allergies to clay minerals.
People desiring stable textures in oil-in-water emulsions.
Individuals sensitive to quaternary ammonium derivatives.
Users of daily cosmetics needing reliable ingredient dispersion.
People avoiding synthetic modifications in natural-only routines.

Safety Notes

  • Low overall hazard profile from safety assessments.
  • Non-comedogenic nature supports broad cosmetic applications.

Frequently Asked Questions about Quaternium-18 Bentonite

What role does Quaternium-18 Bentonite play in products?

It suspends insoluble particles and adjusts viscosity for stability and texture.

Is Quaternium-18 Bentonite comedogenic?

No, it has a comedogenic rating of zero, making it pore-friendly.

How safe is it for cosmetic use?

Rated low hazard with no major concerns from regulatory reviews.