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Moumoujus

SILICA CETYL SILYLATE.

Valuable CAS 199876-45-4 / VISCOSITY CONTROLLING

Silica Cetyl Silylate is a hydrophobic derivative of fumed silica, primarily utilized for its significant absorbent and texture-enhancing properties. It actively reduces excess sebum for a mattified complexion and contributes to a smooth, velvety skin feel, alongside optically blurring minor imperfections. This versatile ingredient also optimizes product formulation for improved application and wear.

Summary

Absorbent Viscosity Controlling Thickening Mattifying Soft-Focus Effect Anticaking Emulsion Stabilizing Skin Conditioning Bulking

Science

Mechanism of Action

As a hydrophobic fumed silica derivative, Silica Cetyl Silylate functions primarily by absorbing excess oil and sebum from the skin's surface, resulting in an effective mattifying effect. It simultaneously acts as a viscosity controlling and thickening agent, improving the rheological properties of cosmetic formulations, which facilitates smoother application and extended product wear. On the skin, it helps create a desirable 'soft-focus' effect, optically minimizing the appearance of pores and imperfections, while imparting a luxurious, velvety finish. Additional roles include anticaking, antifoaming, bulking, emulsion stabilization, and contributing to skin conditioning.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH 3 – 8
0 7 14

Stability

Silica Cetyl Silylate is a hydrophobic ingredient, demonstrating water insolubility. While it can be oil-dispersible and aid in forming gels within oil-based systems, stability may be sensitive to temperature extremes, with related silylates showing potential separation at 4°C and 45°C. General silica exhibits increased solubility at pH values below 3 and above 8, suggesting optimal stability within the pH 3-8 range.

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
25%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated related silica silylates, concluding their safety for cosmetic use when formulated to prevent respiratory irritation or sensitization. A maximum use concentration of 25% has been reported for similar ingredients. The European Commission's Scientific Committee on Consumer Safety (SCCS) has indicated that if Silica Cetyl Silylate is classified as a nanomaterial (over 50% of particles below 100 nm), specific notification is required due to its insolubility. Previous SCCS opinions (2015) identified data deficiencies for silica nanomaterials, prompting a new safety assessment mandate approved for October 2025. Amorphous silica, a broader category, is approved as a food additive by the FDA in the United States. INCIDecoder also rates its irritancy as low.

Your Skin

Skin Compatibility

Yes Normal
No Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

A versatile ingredient valuable for its mattifying, texture-enhancing, and soft-focus properties, though ongoing safety assessments for nanomaterial forms warrant consideration.

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