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C20-40 PARETH-95.

Valuable / CLEANSING, SURFACTANT - CLEANSING

A high-performance polyether that functions as both a sophisticated emulsifier and a moisture-donating film former. It is engineered to stabilize complex oil-in-water systems while providing a breathable, protective shield on the skin's surface.

Emulsifying Film-Forming Skin Conditioning Viscosity Controlling Surfactant

Science

This ingredient utilizes a long-chain carbon backbone (C20-40) paired with extensive ethoxylation to reduce interfacial tension between incompatible phases. On the stratum corneum, it organizes into a hydrophilic occlusive film that traps water molecules, preventing transepidermal water loss (TEWL) without the heaviness typically associated with traditional waxes.


Research

High confidence
Effective range 0.05–2%
Optimal

1.25%

Key findings

  1. 01 Demonstrated 0.05%–0.1% efficiency in stabilizing nano-emulsions (droplets <350nm) and volatile oils.
  2. 02 Proven to function as a potent moisture-donating agent and barrier support at concentrations between 0.5% and 2.0%.

Transparency

Commonly dusted
Min. effective
0.5%
Red flag below
0.1%

While it functions as a stabilizer at very low levels (0.05%), its primary skin-conditioning and barrier-protective benefits require a concentration of at least 0.5%. Formulae using it below this threshold are likely using it for emulsion stability rather than active skin benefit.


The Formula

Solubility
Water
Optimal pH 5 – 9.5
0 7 14

Stability

Highly resilient to high-shear processing and maintains structural integrity across wide temperature variations. It is exceptionally effective at housing sensitive lipophilic actives like retinol.

Synergies

  • Retinol
  • Essential Oils
  • Lipophilic Actives
  • Humectants

Conflicts

  • Strong oxidizing agents
  • Environments with pH below 3.0
  • High concentrations of phenolic compounds

Safety

CIR Status
Safe as used
Max tested
22%
Pregnancy
Safe
Sensitization risk Low

The CIR Expert Panel designates this ingredient as safe for cosmetic use; while hair products may use up to 22%, skincare applications are typically optimized between 0.1% and 5%.


Your Skin

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

Our Assessment

Valuable

A precision-engineered stabilizer and barrier-repair agent that excels at protecting the skin while ensuring the integrity of complex active delivery systems.


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References