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C20-40 PARETH-40.

Valuable CAS 246538-83-0 / CLEANSING, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

A high-performance synthetic emulsifier and structural agent that excels in stabilizing complex formulations. It creates a breathable, protective shield on the skin to enhance moisture retention while providing a refined, smooth finish to skincare textures.

Emulsifying Surfactant Skin conditioning Film forming Thickening agent

Science

This non-ionic surfactant functions by reducing interfacial tension between oil and water, enabling the creation of stable emulsions. On the skin, it organizes into a lightweight, flexible occlusive film that prevents trans-epidermal water loss (TEWL) and improves overall surface texture without a heavy or greasy residue.


Research

High confidence
Effective range 1–10%
Optimal

4%

Key findings

  1. 01 Human Repeated Insult Patch Tests (HRIPT) on structural analogs at 100% concentration demonstrated zero sensitization or irritation.
  2. 02 Three-month dermal toxicity evaluations using 4% concentrations showed no systemic absorption or localized adverse reactions.

Transparency

Not commonly dusted
Min. effective
1%
Red flag below
0.5%

As a functional emulsifier rather than an active, its inclusion is usually determined by formulation stability needs. However, concentrations below 1% in emulsions may indicate its use purely as a processing aid rather than for its skin-conditioning film-forming benefits.


The Formula

Solubility
Both
Optimal pH 3 – 11
0 7 14

Stability

Exceptional thermal stability with a melting point of approximately 88°C. It is highly effective for creating clear stick formulations and thickening aqueous phases.

Synergies

  • Hydro-alcoholic systems
  • Mineral UV filters
  • Waxes

Conflicts

  • High concentrations may reduce the preservative efficacy of phenolics like parabens or phenoxyethanol due to micellar encapsulation.

Safety

CIR Status
Safe as used
Max tested
10%
Pregnancy
Safe
Sensitization risk Low

Its large molecular weight (exceeding 1000 Da) ensures the ingredient remains on the skin surface, preventing systemic absorption and making it exceptionally safe for long-term use.


Your Skin

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

Our Assessment

Valuable

A highly stable, non-irritating emulsifier that provides essential structural integrity to formulas while offering secondary skin-smoothing and hydration benefits.


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