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Moumoujus

PERFLUORONONYLETHYL STEARYL DIMETHICONE.

Avoid / FILM FORMING, SKIN CONDITIONING

This siloxane polymer functions as an emollient and film-forming agent, imparting a soft, smooth feel to the skin. It creates a vapor-permeable, protective barrier, enhancing hydration and offering defense against external elements.

Summary

Film-forming Skin conditioning Emollient Spreading agent Water resistance enhancer Dispersing agent Slip-modifying agent

Science

Mechanism of Action

Perfluorononylethyl Stearyl Dimethicone primarily acts by forming a breathable, protective film on the skin's surface. This polymeric barrier is instrumental in sealing in hydration and actively preventing moisture loss, thereby supporting the skin's natural barrier function. Its inherent low surface tension also grants cosmetic formulations excellent spreading qualities and enhances product glide, while contributing to water resistance in long-wear applications.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

As a polymer typically incorporated into liquid or cream formulations, this ingredient is not associated with 'dusting' concerns, which primarily pertain to powdered ingredients.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

The ingredient demonstrates general stability across typical cosmetic formulation conditions.

Conflicts

  • Its classification as a PFAS (per- and polyfluoralkyl substance) by the Environmental Working Group (EWG) leads to significant regulatory and consumer preference incompatibilities, particularly in brands adhering to clean beauty standards.

Safety

Safety Profile

CIR Status
Safe with restrictions
Sensitization risk Moderate

While the Cosmetic Ingredient Review (CIR) Expert Panel has assessed a broader category of dimethicone polymers as safe when non-irritating, Perfluorononylethyl Stearyl Dimethicone is specifically classified by the Environmental Working Group (EWG) as a PFAS. The EWG labels this ingredient as 'Unacceptable' for its VERIFIED products due to high concerns including enhanced skin absorption, high use restrictions, moderate endocrine disruption potential, high persistence and bioaccumulation, moderate non-reproductive organ system toxicity, and significant contamination concerns.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

Despite its functional benefits as an emollient and film-former, the classification of Perfluorononylethyl Stearyl Dimethicone as a PFAS with high environmental and health concerns by reputable organizations makes it unsuitable for Moumoujus formulations.

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