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Moumoujus

PEG-80 STEARATE.

Valuable CAS 9004-99-3 / CLEANSING, SURFACTANT - CLEANSING

PEG-80 Stearate is a polyoxyethylene ester of stearic acid, primarily valued in skincare for its robust emulsifying properties, which stabilize formulations by ensuring homogenous mixing of oil and water phases. Beyond its structural role, it also acts as a skin conditioning and gentle cleansing agent.

Summary

Emulsifying Surfactant Conditioning Cleansing Humectant Barrier Support Penetration Enhancer

Science

Mechanism of Action

This ingredient functions synergistically across multiple skin benefits. As an emulsifier, it maintains product integrity, preventing ingredient separation. On the skin, it can gently lift oil and impurities, facilitating effective cleansing. Furthermore, PEG-80 Stearate demonstrates humectant capabilities, attracting atmospheric moisture to the skin, thus contributing to a smoother and softer feel. It also aids in strengthening the skin's moisture barrier by forming a thin, protective fatty layer, which impedes transepidermal water loss and enhances hydration. Like other PEGs, it may also modestly enhance the penetration of other active ingredients.

Research

Clinical Evidence

High confidence
Effective range ≤25%
Optimal

25%

Key findings

  1. 01 Human clinical studies involving PEG Stearates, including PEG-80 Stearate, demonstrated no irritating or sensitizing effects when applied at concentrations up to 25%.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 4 – 9
0 7 14

Stability

Functions effectively as an emulsifier to prevent phase separation of oil and water components, thereby enhancing product stability. While an optimal pH for a 3% solution is between 6.0-7.5, it exhibits broad pH tolerance, effective within a final product pH range of approximately 4-9.

Conflicts

  • Avoid use on broken or compromised skin due to documented potential for sensitization and nephrotoxicity observed in specific clinical contexts.

Safety

Safety Profile

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

The CIR Expert Panel has concluded PEG Stearates, including PEG-80 Stearate, are safe for cosmetic use within current concentration practices. Clinical studies confirm no irritation or sensitization at concentrations up to 25% on intact skin. However, critical consideration must be given to potential manufacturing impurities such as ethylene oxide and 1,4-dioxane. Furthermore, it is strongly advised against applying PEG-containing products to broken or severely compromised skin, as cases of sensitization and nephrotoxicity have been reported in burn patients treated with PEG-based topical creams.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG-80 Stearate is a valuable multi-functional ingredient that significantly contributes to product stability, skin conditioning, and mild cleansing, demonstrating a low risk of irritation on intact skin at tested concentrations up to 25%.

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