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PEG-36 CASTOR OIL.

Valuable CAS 61791-12-6 / SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

PEG-36 Castor Oil is a non-ionic surfactant extensively used for its emulsifying and solubilizing capabilities. It effectively blends oil and water phases, allowing for the stable incorporation of water-insoluble ingredients into cosmetic formulations, while also providing emollient and humectant benefits.

Summary

Emulsifying Surfactant Solubilizer Emollient Humectant Dispersing Agent Rheology Modifier Foam Stabilizer

Science

Mechanism of Action

As a non-ionic surfactant, PEG-36 Castor Oil functions by significantly reducing the surface tension between immiscible phases, such as oil and water, thereby enabling the formation and stabilization of emulsions. It acts as a potent solubilizer, facilitating the homogenous integration of lipophilic substances, including fragrances, plant extracts, and fat-soluble vitamins (A, D, E, K), into aqueous systems. Furthermore, it serves as an emollient, enhancing skin softness, a humectant, drawing moisture to the skin, and a dispersing agent. It can also improve foam stability when co-formulated with anionic surfactants and beneficially adjust the viscosity and flow properties of cosmetic products.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 6 – 8.1
0 7 14

Stability

The ingredient is stable under recommended storage conditions, but should be kept away from strong oxidizing agents.

Synergies

  • Improved foam stability when mixed with anionic surfactants.

Conflicts

  • strong oxidizing agents

Safety

Safety Profile

CIR Status
Safe as used with restrictions
Max tested
50%
Sensitization risk Moderate

The Cosmetic Ingredient Review (CIR) Expert Panel concluded that PEG-30, -33, -35, -36, and -40 Castor Oils are safe for use in cosmetics at concentrations up to 50%. However, studies with 50% PEG-35 Castor Oil indicated skin irritation and an increased potential for sensitization by other ingredients, although no direct sensitization was observed. Trace amounts of 1,4-dioxane, a manufacturing by-product, may be present but can be controlled through purification processes. The FDA approves various PEG Castor Oil ingredients for specific indirect food additive applications. EWG lists a 'MODERATE' concern for 'Allergies & Immunotoxicity', citing strong evidence of human skin toxicant or allergen potential.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG-36 Castor Oil is a valuable multifunctional ingredient, widely utilized for its robust emulsifying and solubilizing properties across various cosmetic applications, though its use at higher concentrations (approaching 50%) requires careful consideration due to potential for irritation and increased sensitization risk.

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