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BIS-DIPHENYLETHYL DISILOXANE.

Valuable / SKIN CONDITIONING

A high-refractive-index phenyl silicone designed to elevate formula aesthetics and skin-feel. It is prized for its ability to create crystal-clear emulsions while delivering a non-tacky, velvet-smooth finish that enhances the skin's natural radiance.

Refractive Index Matcher Emollient Skin Conditioning Agent Film Former Texture Enhancer

Science

It functions as an optical harmonizer and conditioning film-former. By matching the refractive index of the oil and water phases, it allows for the production of transparent formulas; simultaneously, its phenyl-substituted structure creates a breathable barrier that reduces the drag of other ingredients and stabilizes surface lipids.


Research

High confidence
Effective range 0.1–10%
Optimal

5%

Key findings

  1. 01 Demonstrated reduction in formula tackiness to levels below 1.5 gm-meters at concentrations of 1-5%, yielding a superior silky texture compared to standard phenyl silicones.
  2. 02 Clinical evaluation showed significant increases in both skin hydration and surface lipid density over a 14-21 day period when used between 0.1-10%.

Transparency

Not commonly dusted
Min. effective
1%
Red flag below
0.1%

While this ingredient is active as a refractive index matcher at lower levels, its clinically proven benefits for skin hydration and texture modification are most prominent at concentrations of 1% and above.


The Formula

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Highly resilient across broad pH and temperature ranges. It is specifically useful for stabilizing water-in-silicone systems without the need for high salt concentrations.

Synergies

  • Phenyl-based silicones
  • Lipophilic UV filters
  • Emollient oils

Conflicts

  • High concentrations of inorganic salts
  • Strong oxidizing agents

Safety

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

Classified as safe within the phenyl-substituted silicone group; included in the FDA's inactive ingredient database for topical applications.


Your Skin

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

Our Assessment

Valuable

An elite multifunctional silicone that optimizes both the visual clarity and the sensory performance of high-precision skincare.


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References