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Moumoujus

PEG-55 STEARATE.

Valuable CAS 9004-99-3 / CLEANSING

PEG-55 Stearate is a hydrophilic polyethylene glycol ester of stearic acid, primarily utilized as an emulsifier to blend oil and water. It also functions as a humectant, drawing moisture to the skin, and enhances product consistency in cosmetic formulations.

Summary

emulsifying viscosity controlling surfactant humectant consistency enhancer

Science

Mechanism of Action

This ingredient functions principally as a hydrophilic emulsifier, derived from the addition of ethylene oxide to fatty acids. Its surfactant properties facilitate the stable mixing of immiscible phases. As a humectant, PEG-55 Stearate retains moisture by forming hydrogen bonds with water molecules, providing long-term hydration and contributing to a skin barrier that reduces water evaporation. It also plays a role in controlling the viscosity of cosmetic products.

Research

Clinical Evidence

High confidence
Effective range 2.3–10%
Optimal

N/A

Key findings

  1. 01 Clinical studies on PEG Stearates, including concentrations up to approximately 25%, consistently indicated these ingredients are neither irritants nor sensitizers when applied to intact skin.
  2. 02 Related PEG derivatives, such as PEG-25 Propylene Glycol Stearate and PEG-55 Propylene Glycol Oleate, demonstrated negative results in clinical patch tests, supporting a low potential for irritation or sensitization.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Polyethylene glycols and their derivatives are generally well-tolerated and exhibit broad pH stability, functioning effectively as nonionic emulsifiers in neutral, mildly alkaline, and acidic systems. They are not typically microbiologically sensitive, often obviating the need for dedicated preservatives within the ingredient itself.

Conflicts

  • Should not be used on damaged or compromised skin due to observed potential for sensitization and nephrotoxicity in burn patients treated with PEG-based preparations.
  • Potential for cross-sensitization with other PEG derivatives exists due to structural similarities.

Safety

Safety Profile

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

The CIR Expert Panel concluded that PEG Stearates, including PEG-55 Stearate, are safe for use in cosmetics, a conclusion reaffirmed in 2002. However, vigilance is required to ensure manufacturers remove toxic impurities like ethylene oxide and 1,4-dioxane. A critical precaution is to avoid using PEGs on damaged or severely compromised skin, as evidence suggests a risk of sensitization and kidney toxicity in such cases. The safety assessment for PEGs is scheduled for a renewed review in 2024.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG-55 Stearate is a valuable multi-functional ingredient, offering effective emulsification and humectant properties for most skin types, but requires careful consideration regarding its use on compromised skin.

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