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C11-15 PARETH-5.

Valuable CAS 173244-48-9 / SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

A non-ionic surfactant and emulsifying agent that stabilizes water-oil interfaces in cosmetic formulations. This versatile ingredient reduces surface tension between phases, enabling smooth product texture and enhanced delivery of both hydrophilic and lipophilic actives.

emulsifying surfactant/cleansing solubilizing

Science

Functions by positioning its hydrophilic polyethylene glycol chain toward water while its hydrophobic C11-15 carbon chain orients toward oil, creating stable microemulsions that improve product spreadability and ingredient solubilization.


Research

High confidence
Effective range 1.5–10%
Optimal

3.25%

Key findings

  1. 01 Human Repeated Insult Patch Test at 30% concentration (6% effective) demonstrated no primary or cumulative skin irritation or sensitization (CIR, 2012)
  2. 02 Hair care formulations show optimal anti-frizz and conditioning benefits at 1.5-5% concentrations as co-emulsifier

Transparency

Not commonly dusted

Primarily used as functional emulsifier rather than marketing ingredient, dusting unlikely due to technical necessity in formulations


The Formula

Solubility
Water
Optimal pH 3.5 – 7
0 7 14

Stability

Demonstrates broad compatibility with anionic, cationic, and non-ionic surfactants due to non-ionic nature; particularly stable in microemulsion systems

Synergies

  • Other non-ionic surfactants
  • Anionic surfactants
  • Cationic surfactants
  • Lipophilic actives requiring solubilization

Conflicts

  • Strong oxidizing agents

Safety

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

CIR Expert Panel confirms safety when formulated to be non-irritating; manufacturing requires control of potential trace impurities including 1,4-dioxane and ethylene oxide


Your Skin

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

Our Assessment

Valuable

Reliable emulsifying agent with excellent safety profile and broad skin compatibility, essential for stable formulation performance.


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References