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CASTOR OIL HYDROGENATED ETHOXYLATED.

Valuable CAS 61788-85-0 / PERFUMING

Commonly known as PEG-40 Hydrogenated Castor Oil, this versatile ingredient serves as a bridge between oil and water, ensuring that lipophilic components like vitamins and fragrances are evenly dispersed. Beyond its structural utility, it acts as a lightweight emollient that reinforces the skin's moisture barrier without a greasy residue.

solubilizing emulsifying surfactant cleansing emollient

Science

This non-ionic surfactant functions by lowering surface tension and forming spherical structures called micelles, which encapsulate oil-soluble actives for stable delivery in water-based formulas. On the skin surface, it creates a breathable, occlusive film that mitigates transepidermal water loss (TEWL) while simultaneously facilitating the penetration of other active ingredients into the stratum corneum.


Research

High confidence
Effective range 1–22%
Optimal

5%

Key findings

  1. 01 Clinical evaluations confirm that concentrations up to 22% in leave-on hair and skin products remain non-reactive and safe for topical application.
  2. 02 Dermal irritancy assessments at 20.66% in microemulsion systems demonstrated zero skin irritation in animal models.
  3. 03 Technical stability testing indicates a 1.0% to 5.0% range is optimal for solubilizing oils while maintaining formula transparency and shelf-life stability.

Transparency

Not commonly dusted
Min. effective
0.5%
Red flag below
0.1%

Because it is primarily a functional solubilizer and emulsifier, it is rarely 'dusted' for marketing claims; its presence is usually dictated by the specific requirements of the formula's oil-to-water ratio.


The Formula

Solubility
Both
Optimal pH 4.5 – 7.5
0 7 14

Stability

Maintains integrity in alcohol-water mixtures but should not be heated above 60°C during production to avoid phase separation.

Synergies

  • Lipophilic vitamins (A, E)
  • Essential oils
  • Glycerin

Conflicts

  • High electrolyte concentrations
  • Extreme pH environments (strong acids/alkalis)
  • High ratios of anionic surfactants

Safety

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

Modern manufacturing processes employ rigorous purification to eliminate potential 1,4-dioxane impurities, making the final cosmetic-grade material safe for all users.


Your Skin

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

Our Assessment

Valuable

An essential formulation tool that ensures product stability and active ingredient delivery while providing mild emolliency across all skin types.


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