Quaternium-18 Hectorite

What is Quaternium-18 Hectorite?

Quaternium-18 Hectorite is an organically modified clay derived from hectorite, a natural smectite mineral, treated with a quaternary ammonium compound called distearyldimonium chloride. This chemical modification allows it to disperse readily in oils and organic solvents, unlike untreated clays. In cosmetics, it belongs to the rheology control category, commonly found in foundations, mascaras, lotions, and sunscreens. It functions by swelling and forming a three-dimensional gel network when hydrated or sheared, which traps particles like pigments or actives, prevents settling, and provides smooth, spreadable consistency. This enhances product stability during storage and application, particularly in water-in-oil emulsions or anhydrous formulas.

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 actives to prevent clumping or separation.

Improves product texture for easier spreading and application.

Enhances formula stability across various temperatures and storage conditions.

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 makeup products seeking long-lasting, non-settling coverage.
Those with rare allergies to clay minerals or quaternary compounds.
People with oily skin formulas needing controlled thickness.
People sensitive to organoclay thickeners in high concentrations.
Individuals preferring stable emulsions without phase separation.
Users preferring mineral-free or simple formulations.

Safety Notes

  • Rated low hazard by safety assessments for cosmetic use.
  • Generally non-comedogenic and suitable for most skin types.

Frequently Asked Questions about Quaternium-18 Hectorite

What does Quaternium-18 Hectorite do in skincare?

It suspends particles and controls viscosity for stable, smooth-textured products.

Is Quaternium-18 Hectorite safe for skin?

Safety reviews confirm it poses low risk when used as directed in cosmetics.

Does it clog pores?

It has a non-comedogenic rating, unlikely to contribute to breakouts.