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TRIMETHYLSILOXYPHENYL DIMETHICONE.

Valuable CAS 73138-88-2 / HAIR CONDITIONING

Trimethylsiloxyphenyl Dimethicone is a silicone polymer that creates a breathable, non-penetrating film on the skin's surface. This film effectively seals in moisture, minimizes water loss, and imparts a perceptibly smooth, soft feel while visibly improving skin texture.

Summary

Film Former Emollient Skin Conditioning Moisturizing/Hydrating Softening Gloss Agent Protective Barrier Water Repellent Reduces Tackiness

Science

Mechanism of Action

This ingredient operates by forming a hydrophobic, vapor-permeable film directly on the skin, without epidermal penetration due to its higher molecular weight. This film acts as a protective barrier, preventing trans-epidermal water loss and maintaining skin hydration. It functions as an emollient and skin protectant, providing a silky, non-tacky finish with a subtle gloss. Additionally, it can temporarily diminish the appearance of fine lines and wrinkles, contributing to a plumper skin look.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Demonstrated excellent skin tolerability, with concentrations up to 100% pure Trimethylsiloxyphenyl Dimethicone showing no irritation in Human Repeat Insult Patch Tests (HRIPT) on 51 subjects.
  2. 02 Further irritation studies, including a 24-hour Skin Irritation Open Patch Test (SIOPT) at 5% on 18 subjects and a 15-day cumulative irritation test at 2% on 28 subjects, consistently reported no irritation.
  3. 03 A 3% cream formulation and a product containing 38.006% also yielded negative HRIPT results across 103 and 205 subjects, respectively.
  4. 04 At 2%, repeated dermal application in a serum was not associated with photoallergic potential when exposed to sunlight, as confirmed in a study of 26 subjects.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Exhibits enhanced compatibility with diverse cosmetic ingredients and improved chemical stability against oxidation.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
23%
Sensitization risk Low

The CIR Expert Panel affirmed its safety in cosmetics at current usage levels and concentrations, with a specific caution regarding incidental inhalation due to insufficient data. Its higher molecular weight typically reduces skin penetration. While Dimethicone is FDA-classified as a skin protectant, the FDA has not evaluated this specific ingredient in airbrush delivery systems.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Trimethylsiloxyphenyl Dimethicone is a valuable film-forming emollient, offering excellent skin protection and a smooth feel with broad skin compatibility and a robust safety profile.

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