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PEG-40 CASTOR OIL.

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

A multifunctional ingredient primarily utilized in its hydrogenated form, PEG-40 Castor Oil acts as an emollient and humectant, significantly contributing to improved skin hydration and barrier integrity. It also serves as an effective emulsifier and solubilizer, enabling stable formulations and aiding in gentle skin cleansing.

Summary

Emulsifying Surfactant Solubilizer Emollient Humectant Skin Barrier Enhancer Anti-inflammatory (potential)

Science

Mechanism of Action

PEG-40 Castor Oil operates by forming a protective film on the skin's surface, which effectively minimizes transepidermal water loss and locks in moisture absorbed from the air, thereby boosting skin hydration and promoting a soft texture. Its surfactant, emulsifying, and solubilizing properties reduce surface tension, allowing oil and water to blend harmoniously and facilitating the gentle removal of impurities. Furthermore, it supports the skin's natural barrier by reinforcing the epidermal layer and enhancing lipid stability, potentially offering anti-inflammatory benefits and improving the penetration of other active ingredients.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

As a liquid, PEG-40 Castor Oil is not associated with dusting in cosmetic formulations.

The Formula

Formulation

Solubility
Both
Optimal pH 5.5 – 7
0 7 14

Stability

It forms clear solutions in water, ethanol, and isopropanol, indicating good stability across common solvents.

Synergies

  • Active ingredients requiring enhanced skin penetration
  • Formulations aimed at improving skin barrier function

Safety

Safety Profile

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

The CIR Expert Panel has deemed PEG-40 Hydrogenated Castor Oil safe for cosmetic use up to 100% concentration, with studies showing no dermal or ocular irritation. However, individual sensitivities are possible, with rare reports of reactions like itching or hives, suggesting a patch test for sensitive individuals. It is important to note that a related, non-hydrogenated ingredient (PEG-35 Castor Oil) was observed to increase the sensitization potential of other ingredients at 50% concentration, a finding not directly attributed to PEG-40 Hydrogenated Castor Oil.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG-40 Castor Oil is a valuable, well-tolerated ingredient that significantly supports skin hydration and barrier function, while also serving as a critical emulsifier and solubilizer across a broad spectrum of cosmetic formulations.

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