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PEG-35 CASTOR OIL.

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

PEG-35 Castor Oil is a multifaceted non-ionic surfactant and emulsifier derived from castor oil. It is highly effective at stabilizing oil-in-water emulsions and solubilizing lipophilic compounds within aqueous systems, while also offering mild emollient and penetration-enhancing properties.

Summary

Emulsifying Surfactant Solubilizing Emollient Penetration Enhancer Cleansing

Science

Mechanism of Action

Operating as a non-ionic surfactant and emulsifier, PEG-35 Castor Oil actively lowers the surface tension between immiscible liquids, thereby promoting the formation of stable oil-in-water emulsions and homogenizing disparate oil and water phases. Its solubilizing capacity allows for the even dispersion of oils, fragrances, and lipophilic active ingredients in aqueous bases. Furthermore, it provides gentle cleansing action, contributes to skin hydration by forming a protective film against moisture evaporation, and can enhance the dermal penetration of other topical ingredients.

Research

Clinical Evidence

High confidence
Effective range 1–10%
Optimal

N/A

Key findings

  1. 01 The CIR Expert Panel concluded it is safe for cosmetic use at concentrations up to 50%, provided formulations are designed to be non-irritating.
  2. 02 At typical usage levels (1-10%), this ingredient demonstrates low irritation and sensitization potential.
  3. 03 It is effectively utilized in crème rinses and conditioners, where concentrations between 3.5% and 7% (with 5% being common) yield stable and elegant formulations.
  4. 04 Nanoemulsions incorporating up to 13.5% PEG-35 castor oil were observed to be non-irritating in rabbit eye studies.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

This ingredient exhibits stability within a neutral to slightly alkaline pH environment.

Conflicts

  • When formulating with ingredients of high ionic strength, such as protein hydrolyzates, acidic buffers, or salts, these should be incorporated during the cooling cycle, specifically below 40°C, to ensure the stability of the emulsion.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
50%
Sensitization risk Low

The CIR Expert Panel has deemed PEG-35 Castor Oil safe for cosmetic applications at concentrations up to 50%, contingent on the final formulation being non-irritating. It is generally well-tolerated, showing low irritation and sensitization potential at typical use levels. While it has a low to moderate hazard rating from EWG due to potential 1,4-dioxane contamination from ethoxylation, this risk is minimized in purified grades. It is important to note that it may increase the sensitization potential of other ingredients within a formulation. EU COSING approves its use for emulsifying and surfactant functions.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG-35 Castor Oil is a valuable and versatile excipient, essential for creating stable emulsions and effectively solubilizing key ingredients across a broad spectrum of cosmetic and personal care formulations.

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