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ISOSTEARYL CARBOXYDECYL PEG-8 DIMETHICONE.

Valuable / SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

This silicone-based polymer serves as a multi-functional cosmetic ingredient, primarily functioning as an emulsifier and emollient. It also helps form a protective barrier on the skin, contributing to enhanced hydration and improved product texture and spreadability.

Summary

Surfactant Emulsifying Emollient Skin conditioning Barrier formation

Science

Mechanism of Action

ISOSTEARYL CARBOXYDECYL PEG-8 DIMETHICONE functions as a surfactant and emulsifier, enabling the stable mixing of oil and water phases in cosmetic formulations. Its silicone-based polymer structure imparts emollient properties, delivering a smooth, silky feel to products and enhancing their spreadability. Additionally, it forms a protective film on the skin's surface, which aids in moisture retention and acts as a skin conditioning agent, improving overall skin feel and reducing tackiness.

Research

Clinical Evidence

Low confidence
Effective range 0.024–5.6%
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 5.5 – 8.5
0 7 14

Stability

For optimal formulation stability, a pH range between 5.5 and 8.5 is recommended. Heating the ingredient above 50°C (125°F) should be avoided; it can be integrated into emulsions after the temperature has naturally cooled to or below 50°C (125°F).

Safety

Safety Profile

CIR Status
Safe as used with restrictions
Max tested
5.6%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has determined that dimethicone and related polymers, including PEG-8 dimethicone, are safe for use in cosmetics when formulated to be non-irritating. PEG-8 dimethicone specifically has been assessed as safe within a concentration range of 0.024% to 5.6%. Due to its large molecular weight, significant skin absorption is considered unlikely. The FDA acknowledges dimethicone as a safe skin protectant at low concentrations. However, the Environmental Working Group (EWG) has raised concerns regarding potential contamination by toxic impurities like ethylene oxide (typically <1 ppm) and 1,4-dioxane (typically <10 ppm), both classified as carcinogens by the State of California. EWG also notes 'some' concerns for ISOSTEARYL CARBOXYDECYL PEG-8 DIMETHICONE concerning potential cancer and reproductive toxicity.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

This multifunctional silicone polymer is valuable for its emulsifying, emollient, and skin conditioning properties, enhancing product texture and barrier function, though potential impurity concerns warrant careful sourcing.

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