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PEG-9 ISOSTEARATE.

Valuable CAS 56002-14-3 / SURFACTANT - EMULSIFYING

PEG-9 Isostearate is a versatile ingredient functioning primarily as an emulsifier and surfactant, enabling the stable blending of oil and water phases in cosmetic formulations. It also enhances skin hydration by attracting moisture and acts as an emollient, promoting a softer skin texture and reinforcing the skin's natural moisture barrier.

Summary

Emulsifying Surfactant Emollient Humectant Coupling Agent Solubilizer Viscosity Enhancer

Science

Mechanism of Action

This ingredient operates by strategically reducing the interfacial tension between immiscible liquids, such as oil and water, facilitating the formation of stable, homogeneous emulsions. Its amphiphilic structure, characterized by both hydrophilic and lipophilic segments, allows it to effectively solubilize and stabilize various components within a formulation. Furthermore, as a polyethylene glycol derivative, it contributes to cutaneous moisture retention by establishing hydrogen bonds with water molecules, thereby supporting sustained hydration and imparting emollient properties that soften the skin's surface and enhance its natural barrier function.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

PEG-9 Isostearate primarily functions as an emulsifier, surfactant, and emollient, not an active ingredient typically subject to 'dusting' concerns regarding efficacy.

The Formula

Formulation

Solubility
Both
Optimal pH 4 – 9
0 7 14

Stability

PEGylated isostearates, including PEG-9 Isostearate, demonstrate stability under normal conditions and within a pH range of 4 to 9. Strong oxidizing agents should be avoided to maintain ingredient integrity.

Conflicts

  • strong oxidizing agents

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has deemed PEG Stearates, a group including PEG-9 Stearate, safe for cosmetic use at current practices and concentrations. Clinical studies have shown these ingredients to be non-irritating or non-sensitizing at concentrations up to 25%. However, a critical consideration for all PEGs is the potential for 1,4-dioxane, a suspected human carcinogen, to be present as a byproduct of the ethoxylation synthesis process. Consequently, PEG-9 Isostearate should not be applied to compromised or damaged skin.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG-9 Isostearate is a valuable multi-functional ingredient, primarily stabilizing formulations as an emulsifier and surfactant while offering significant hydrating and emollient benefits to the skin.

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