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TROMETHAMINE MAGNESIUM ALUMINUM SILICATE.

Valuable CAS 66456-45-9 / VISCOSITY CONTROLLING

A refined clay-derived mineral, Tromethamine Magnesium Aluminum Silicate serves as a multifaceted ingredient in precision skincare. Primarily, it functions as a highly efficient rheological modifier, emulsion stabilizer, and absorbent, contributing to optimal product texture and skin feel. Its unique structure enables the creation of elegant, stable formulations.

Summary

Absorbent Anticaking Emulsion Stabilizing Opacifying Viscosity Controlling Rheological Modifier Binder Suspending Agent Film Former (Lifting Effect)

Science

Mechanism of Action

This ingredient, a type of Magnesium Aluminum Silicate, operates by forming a 'house of card' colloidal network in water, composed of charged platelets. This network effectively thickens products, stabilizes emulsions, and suspends insoluble particles like pigments. Exhibiting thixotropy, it ensures products are viscous in the container but easily spreadable upon skin contact. Additionally, its high absorption capacity targets excess oil and sebum, promoting a matte complexion. When applied, it can form a fine, continuous film that, upon drying, exerts a gentle mechanical tension, providing an instant, temporary smoothing effect on the appearance of fine lines and wrinkles.

Research

Clinical Evidence

Medium confidence
Effective range 0.5–3%
Optimal

1%

Transparency

Dusting Analysis

Commonly dusted

For naturally-sourced (mined) forms of Magnesium Aluminum Silicate, there is insufficient data to determine the safety of incidental inhalation. Consequently, formulations intended for spray application should be precisely designed to minimize inhalation exposure.

The Formula

Formulation

Solubility
Water
Optimal pH ≥3.5
0 7 14

Stability

Tromethamine Magnesium Aluminum Silicate exhibits robust stability across a wide pH range, generally maintaining its integrity above pH 3.5; solutions below this pH may compromise its colloidal structure. A typical 5% dispersion in water yields a pH of 9.0-10.0. It is indefinitely stable when stored dry and is compatible with organic solvents, though its hygroscopic nature necessitates dry storage conditions.

Conflicts

  • Highly acidic solutions (below pH 3.5) can destabilize its colloidal network, affecting rheology and stability.
  • Certain pharmaceutical active ingredients (e.g., amfetamine sulfate, tolbutamide, warfarin sodium, diazepam) may experience reduced bioavailability due to adsorption by the silicate.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
30%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Tromethamine Magnesium Aluminum Silicate is safe for cosmetic use, with proven safety at concentrations up to 30%. While animal studies (rabbits) showed weak primary skin irritation at 4%, human topical application demonstrated no adverse effects. The ingredient presents a minimal risk of skin irritation or sensitization, with no reported genotoxic or teratogenic effects. However, for individuals with sensitive skin, a preliminary patch test is recommended. Specific caution is advised for naturally-sourced forms in spray products to mitigate potential inhalation risks.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Tromethamine Magnesium Aluminum Silicate is a valuable, multifunctional ingredient, highly regarded for its precise rheological control, robust emulsion stabilization, and oil-absorbing capabilities, all within an excellent safety profile for all skin types.

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