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MAGNESIUM POTASSIUM FLUOROSILICATE.

Questionable CAS - / ABRASIVE

Magnesium Potassium Fluorosilicate is a mineral-derived compound primarily functioning as a physical exfoliant and mattifying agent in skincare formulations. It helps refine skin texture by removing dead cells and excess oil, contributing to a smoother, less shiny complexion.

Summary

Abrasive Exfoliant Mattifying

Science

Mechanism of Action

This ingredient works through physical action, serving as an abrasive to gently scrub away surface impurities and dead skin cells, which supports skin renewal and a more uniform tone. It also provides a visible mattifying effect by absorbing excess oil, thereby reducing shine and preventing unwanted darkening or highlighting of the skin.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Commonly dusted
Min. effective
0.1% crystalline silica in raw material for incidentally inhaled products (or demonstrated safety at higher levels)%
Red flag below
0.1% crystalline silica (if no repeated-dose inhalation studies are available)%

The Cosmetic Ingredient Review (CIR) Expert Panel advises that silicates, including Magnesium Potassium Fluorosilicate, are safe for cosmetic use provided products are non-irritating and not expected to be incidentally inhaled. For formulations where incidental inhalation is possible (e.g., powders, sprays), safety is contingent on crystalline silica content being below 0.1% in the raw material, or if repeated-dose inhalation studies confirm no adverse effects at concentrations of 0.1% or higher. Data is specifically insufficient for airbrush applications.

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

This crystalline solid is known to decompose at 120 °C and forms basic aqueous solutions. It is incompatible with acids and can slowly react with water, potentially generating hydrofluoric acid.

Conflicts

  • Acids

Safety

Safety Profile

CIR Status
Safe with restrictions
Sensitization risk Low

While generally considered safe for cosmetic use with infrequent adverse reactions, the Cosmetic Ingredient Review (CIR) Expert Panel has imposed restrictions, particularly concerning incidental inhalation due to potential crystalline silica content. The raw compound, Magnesium Fluorosilicate, is noted as highly toxic if inhaled, ingested, or absorbed cutaneously, and its contact may induce slight irritation to skin, eyes, and mucous membranes. A critical concern is its slow reaction with water to potentially form hydrofluoric acid, a highly corrosive substance, which necessitates careful formulation to prevent this reaction.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

Despite its exfoliating and mattifying benefits, the significant safety restrictions regarding inhalation and the potential for hydrofluoric acid formation make this ingredient questionable for precision skincare, demanding extremely careful formulation and strict usage conditions.

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