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Moumoujus

SILICA DIMETHYL SILYLATE.

Valuable CAS 68611-44-9 / ANTICAKING, ANTIFOAMING, EMULSION STABILISING, SKIN CONDITIONING - EMOLLIENT, VISCOSITY CONTROLLING

Silica Dimethyl Silylate is a hydrophobic fumed silica, expertly crafted to enhance the texture and stability of skincare formulations. It acts as a versatile rheology modifier and absorbent, delivering a refined matte finish while effectively controlling sebum and improving product feel.

Summary

Absorbent Emulsion Stabilising Viscosity Controlling Rheology Modifier Texture Enhancer Anti-caking Agent Emollient Suspension Aid

Science

Mechanism of Action

This ingredient functions by forming a robust three-dimensional network within oil-based systems, which significantly increases viscosity and facilitates the creation of clear oil gels. Its high absorbency allows it to effectively manage excess sebum on the skin's surface, contributing to a matte complexion and reduced shine. Beyond rheological control, it acts as an anti-caking agent, ensures uniform suspension of particles, and as an emollient, it subtly fills microscopic gaps between dead skin cells, promoting a smoother skin feel and supporting the skin barrier.

Research

Clinical Evidence

High confidence
Effective range 0.1–30%
Optimal

0.5%

Key findings

  1. 01 Provides a distinctive matte texture to the skin.
  2. 02 Serves as an effective thickening agent, oil gelling agent, suspension aid, and stabilizer in oil-based formulations.
  3. 03 Typically facilitates the formation of clear oil-gels.

Transparency

Dusting Analysis

Commonly dusted
Min. effective
10%
Red flag below
10%

While primarily incorporated into oil-based creams and gels, Silica Dimethyl Silylate can be present in aerosolized products. The CIR Expert Panel considers concentrations up to 10% safe in aerosolized cosmetics, noting that particle size and low exposure generally limit significant inhalation risk. However, the SCCS expresses concerns regarding its nano-form, emphasizing that if over 50% of its particles are below 100 nanometers, it requires specific data for safety assessment due to potential regulatory classification as a nanomaterial.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Exhibits high intrinsic stability with an indefinite shelf life when stored in a cool, dark, and dry environment. To maintain optimal performance, formulations containing this ingredient should avoid sustained exposure to temperatures exceeding 80°C.

Synergies

  • Oils
  • Polyols
  • Silicones
  • Esters (for enhanced viscosity and gel formation)

Conflicts

  • Water (insoluble, demanding careful phase separation during formulation)
  • Highly polar oil blends (can inhibit optimal gel formation)
  • Excessive alcohol content (can inhibit optimal gel formation)

Safety

Safety Profile

CIR Status
Safe as used
Max tested
10%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has determined Silica Dimethyl Silylate to be safe as used, provided the final product does not induce irritation or sensitization, particularly within the respiratory tract. It is a stable solid, unlikely to penetrate the skin, and rarely causes dermal irritation or allergic reactions. However, the European Commission's SCCS has noted insufficient data for safety assessment of its nano-form, particularly concerning reliable dermal penetration and toxicology if more than 50% of its particles are below 100 nanometers.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Silica Dimethyl Silylate is a highly valuable and safe ingredient, providing significant benefits in formulation texture, stability, and sebum control, making it suitable for a broad spectrum of oil-based skincare and cosmetic applications.

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