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HYDROXYETHYL DIMETHICONE.

Valuable / NOT REPORTED

Hydroxyethyl Dimethicone is a sophisticated modified silicone, primarily valued for its dual functionality as an emulsifier and skin conditioning agent. It forms a temporary, breathable barrier on the skin, effectively reducing transepidermal water loss to enhance hydration and provide protection against environmental factors.

Summary

Emulsifier Skin conditioning agent Skin protectant Film former

Science

Mechanism of Action

This modified silicone acts by forming a hydrophobic, yet breathable, occlusive layer on the skin's surface. This barrier demonstrably reduces transepidermal water loss (TEWL), thereby locking in essential moisture and mitigating dryness. Beyond hydration, it physically protects the skin from external irritants and allergens. Its unique properties also contribute to a visibly smoother skin texture by temporarily refining the appearance of fine lines and pores, imparting a characteristically silky and slippery feel. Furthermore, in formulations, it serves as an effective emulsifier, stabilizing oil and water phases to maintain product integrity.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH 5.5 – 8.5
0 7 14

Stability

As a key emulsifying agent, Hydroxyethyl Dimethicone is crucial for creating and stabilizing oil-in-water or water-in-oil emulsions, with its quantity directly impacting emulsion stability. While general dimethicones exhibit high stability across various conditions (pH, air, light), related dimethicone copolyols demonstrate optimal stability within a pH range of 5.5 to 8.5. Some specific silicone surfactants can show instability outside this range.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
85%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed the safety of Dimethicone and its related polymers, including Hydroxyethyl Dimethicone, for use in cosmetic products, even at increased concentrations. Due to their large molecular weight, these polymers are considered unlikely to be significantly absorbed into the skin. The FDA classifies Dimethicone as a Category I (safe and effective) skin protectant, approving it for concentrations up to 30%, and also for diaper rash treatment and prevention. The maximum reported concentration for dermal contact products is 85%. Hydroxyethyl Dimethicone is not subject to any specific restrictions in Europe.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Hydroxyethyl Dimethicone is a valuable ingredient, effectively enhancing skin barrier function and hydration while also providing critical formulation stability as an emulsifier.

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