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DIPHENYLSILOXY PHENYL/PROPYL TRIMETHICONE.

Valuable CAS - / HAIR CONDITIONING, SKIN CONDITIONING - EMOLLIENT

A sophisticated silicone polymer designed to elevate cosmetic formulations, providing a uniquely smooth and cushioned skin feel with a lightweight, non-oily finish. It excels at forming a breathable film that locks in moisture while enhancing radiance and product spreadability.

Summary

Antifoaming Hair conditioning Skin conditioning

Science

Mechanism of Action

This ingredient functions primarily as a skin and hair conditioning agent, and an antifoaming agent. It forms a resilient, non-sticky, and breathable film on the skin, effectively minimizing moisture loss without hindering oxygen exchange. Its high refractive index visibly enhances skin and hair radiance, while its textural properties improve product slip, reducing the tackiness of other formulation components.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

5.3%

Key findings

  1. 01 Reported use in makeup bases at concentrations up to 5.3% demonstrates its functional incorporation into various cosmetic formulations for textural and aesthetic benefits.

Transparency

Dusting Analysis

Not commonly dusted

This ingredient is a silicone polymer and is not associated with the 'dusting' phenomenon observed with some powdered active ingredients.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Exhibits broad compatibility with various silicones, esters, and oils, and is co-soluble with ethanol and mineral oils. It can be incorporated into the oil or silicone phase of emulsions and can tolerate typical oil-phase heating during processing. For anhydrous systems, it should be blended with other silicones and oils before combining with waxes, taking care to avoid excessive air entrapment. It can also be post-added during the cool-down phase (<40°C) to fine-tune product slip and shine. Avoid contact with strong acids, alkalis, and impurities.

Synergies

  • Other silicones
  • Esters
  • Various oils
  • Ethanol
  • Mineral oils

Conflicts

  • Strong acids
  • Alkali chemical materials
  • Impurities

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
5.3%
Sensitization risk Low

The CIR Expert Panel considers phenyl-substituted methicones, including Diphenylsiloxy Phenyl/Propyl Trimethicone, safe for cosmetic use under current practices and concentrations. A key restriction indicates insufficient data for safety when used in products that may be incidentally inhaled. Acute dermal toxicity studies in Wistar rats showed a low dermal toxicity (LD50 >2000 mg/kg). Primary dermal irritation tests confirmed it is not irritating to rabbit skin at 100% concentration, and ocular irritation was classified as slight but not GHS irritating. Dermal absorption is estimated at 10%.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Diphenylsiloxy Phenyl/Propyl Trimethicone is a valuable silicone for enhancing skin texture, product feel, and cosmetic aesthetics, with a strong safety profile for topical application at concentrations up to 5.3%.

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