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Moumoujus

PEG-9 STEARATE.

Valuable CAS 9004-99-3 / SURFACTANT - EMULSIFYING

PEG-9 Stearate is a polyoxyethylated fatty acid ester that primarily functions as a surfactant and emulsifier. It is crucial for stabilizing formulations, allowing immiscible components like oil and water to blend uniformly in precision skincare products.

Summary

emulsifying surfactant solubilizer humectant skin conditioner penetration enhancer

Science

Mechanism of Action

Operating as a highly effective surfactant, PEG-9 Stearate significantly reduces the interfacial tension between immiscible liquids, thereby allowing stable emulsions to form. Beyond its emulsifying capabilities, it also acts as a solubilizer for various active compounds and fragrance oils. Its humectant properties draw and retain moisture, contributing to skin hydration, while also serving as a skin conditioning agent. Furthermore, it may enhance the dermal penetration of other active ingredients, augmenting their bioavailability within the skin.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Clinical studies have shown that PEG Stearates, including PEG-9 Stearate, are not irritating or sensitizing when applied to intact skin at concentrations up to 25%.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Safety

Safety Profile

CIR Status
Safe as used
Max tested
25%
Sensitization risk Low

The CIR Expert Panel concluded PEG Stearates, including PEG-9 Stearate, are safe for cosmetic use within current concentrations. While generally non-irritating on intact skin, there is a critical caveat: sensitization and potential nephrotoxicity have been observed in burn patients treated with PEG-based creams. Therefore, this ingredient should not be applied to compromised or damaged skin. Manufacturers are advised to stringently minimize impurities like ethylene oxide and 1,4-dioxane.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

PEG-9 Stearate is a valuable formulating agent for stabilizing emulsions and enhancing skin conditioning, provided it is used on intact skin to mitigate rare sensitization risks associated with damaged barriers.

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