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PEG-32 STEARATE.

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

PEG-32 Stearate is a polyoxyethylated fatty acid ester, expertly utilized in skincare for its multi-functional properties. It acts as a versatile emulsifier and surfactant, stabilizing product formulations while also providing emollient and humectant benefits to the skin.

Summary

Emulsifying Surfactant Humectant Emollient Consistency Enhancer Binding Agent Softening Agent Solubilizer Solvent

Science

Mechanism of Action

PEG-32 Stearate functions primarily by reducing the surface tension within cosmetic formulations, allowing immiscible ingredients like oil and water to blend smoothly. As an emulsifier, it facilitates the creation and stability of fine dispersions (emulsions), crucial for product texture and integrity. Its surfactant properties assist in distributing products evenly and aiding in the solubilization of oils and dirt for effective cleansing. On the skin, it acts as an emollient, conditioning and softening the skin's surface. Furthermore, it exhibits humectant properties by forming hydrogen bonds with water molecules, thereby retaining moisture, minimizing transepidermal water loss, and contributing to sustained skin hydration. It also enhances product consistency, acts as a binding agent, and serves as a solvent.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Clinical studies on PEG Stearates, including PEG-32 Stearate, found them to be neither irritants nor sensitizers when tested at concentrations of 25% or greater.
  2. 02 Animal studies conducted at 100% concentration showed only minimal potential for skin and eye irritation from PEG Stearates, including PEG-32 Stearate.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 5 – 7.5
0 7 14

Stability

A 3% solution of PEG-32 Stearate typically exhibits a pH range of 5.0 to 7.5. PEG Stearates demonstrate good tolerance by the skin and are not prone to microbiological sensitivity, which may contribute to a reduced need for preservatives in certain formulations.

Safety

Safety Profile

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

The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed PEG-32 Stearate, alongside other PEG Stearates, as safe for use in cosmetic and personal care products. This conclusion has been consistently reaffirmed, most recently in 2024. Indirect support for its safety comes from the FDA's approval of the related PEG-8 Stearate as an indirect food additive. In the European Union, its use is permitted under general cosmetic regulations, particularly if the stearic acid component is derived from plant sources.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG-32 Stearate is a valuable multi-functional ingredient, significantly contributing to formulation stability and texture while offering beneficial emollient and humectant properties, all with a consistently low risk of irritation or sensitization for various skin types.

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