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PHENYL DIMETHICONE.

Valuable CAS 9005-12-3 / ANTIFOAMING, SKIN CONDITIONING

Phenyl Dimethicone is a precision silicone polymer engineered to enhance skin texture and hydration. It functions as an effective emollient and skin conditioning agent, creating a breathable, protective film that reduces moisture loss and imparts a silky, non-oily feel.

Summary

Emollient Skin Conditioning Antifoaming Water Repellent Reduces Tackiness/Stickiness Adds Gloss

Science

Mechanism of Action

This ingredient primarily operates by forming a vapor-permeable, protective film on the skin's surface. This film acts as a hydration-sealing occlusive, significantly reducing transepidermal water loss and thereby enhancing skin hydration. Concurrently, it delivers non-oily, easy-to-spread emolliency, contributing to a luxuriously smooth skin feel and diminishing the tackiness often associated with other formulation components. It also exhibits water-repellent and antifoaming properties.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 A 10-day clinical trial of Phenyl Trimethicone dermal absorption (a related compound) in five panelists, applying a 50 mg/kg dose once daily, resulted in no detectable amounts of silicone in the blood and only insignificant changes in the urine, indicating extremely low dermal absorption.

Transparency

Dusting Analysis

Not commonly dusted

Phenyl Dimethicone functions primarily as a formulation aid and skin conditioning agent, not typically an active ingredient that would be 'dusted' at high concentrations where efficacy is lost. Its role is integral to product texture and feel.

The Formula

Formulation

Solubility
Oil
Optimal pH 3 – 10
0 7 14

Stability

Phenyl Dimethicone exhibits robust chemical stability across a pH range of 3 to 10. It is inherently resistant to both water and heat, and its inert chemical nature ensures compatibility with a broad spectrum of ingredients, including acids, alkalis, and sensitive active compounds.

Synergies

  • Retinol
  • Niacinamide
  • UV filters

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The Expert Panel for Cosmetic Ingredient Safety (CIR) concluded in September 2023 that Phenyl Dimethicone, alongside other linear phenyl-substituted methicones, is safe for cosmetic use within current practice and concentration. However, data remains insufficient to establish safety for products where incidental inhalation might occur.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Phenyl Dimethicone is a valuable ingredient for advanced skincare formulations, offering excellent textural enhancement, hydration benefits, and broad compatibility with minimal irritation risk.

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References

Sources