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PEG-50 HYDROGENATED CASTOR OIL ISOSTEARATE.

Valuable / SURFACTANT - EMULSIFYING, VISCOSITY CONTROLLING

PEG-50 Hydrogenated Castor Oil Isostearate is a versatile, hydrophilic, nonionic ingredient functioning primarily as an emulsifier and solubilizer. It enables stable blends of immiscible liquids like oil and water, and helps water-insoluble actives integrate into aqueous systems, enhancing formulation clarity and stability.

Summary

Emulsifying Solubilizing Surfactant Viscosity Controlling

Science

Mechanism of Action

This ingredient operates by decreasing surface tension, acting as a nonionic surfactant. As an emulsifier, it stabilizes oil-in-water or water-in-oil emulsions, allowing disparate liquid phases to coexist uniformly. Its solubilizing properties are crucial for dispersing hydrophobic compounds, such as fragrance oils or colorants, evenly within water-based formulations. Furthermore, it contributes to the textural integrity of products by acting as a viscosity controlling agent. While its inherent emollient and humectant benefits are rooted in its Hydrogenated Castor Oil base, these properties are integrated into its overall contribution to product feel.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Related PEGylated castor oils, specifically PEG-30 and PEG-40 Hydrogenated Castor Oil, have been deemed safe for use at concentrations up to 100% in cosmetic applications.
  2. 02 Microemulsion systems incorporating PEG-40 Hydrogenated Castor Oil at 20.66% did not induce skin irritation in rat models.
  3. 03 Nanoemulsions containing PEG-35 Castor Oil at concentrations up to 13.5% demonstrated non-irritating properties in rabbit eye studies.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Both
Optimal pH 5.5 – 7
0 7 14

Stability

Optimal stability is observed within a moderate pH range of 5.5 to 7.0. It is susceptible to hydrolysis under strongly acidic or alkaline conditions, which may impact formulation integrity.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
100%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that PEG-50 Hydrogenated Castor Oil Isostearate, alongside 129 other PEGylated oil derivatives, is safe for use in cosmetics under current practices and concentrations, provided formulations are non-irritating. The FDA recognizes castor oil as a permitted flavoring agent, and certain PEG Castor Oil ingredients are approved as indirect food additives. While potential impurities like 1,4-dioxane and ethylene oxide can arise from the ethoxylation process, these can be effectively mitigated through appropriate purification steps during manufacturing.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

This ingredient is a valuable formulation aid, excelling as a solubilizer and emulsifier with a strong safety profile and broad compatibility across various cosmetic product types and skin conditions.

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