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C11-15 PARETH-12.

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

A versatile non-ionic surfactant that bridges oil and water phases through its dual-chain structure, enabling stable emulsions and effective cleansing. Functions as both an emulsifying agent and gentle cleanser, making it particularly valuable in formulating micellar waters and oil-in-water systems. Its wide pH tolerance and compatibility with various ingredients make it a reliable workhorse in cosmetic formulation.

Emulsifying Surfactant/Cleansing Solubilizing

Science

Operates by reducing interfacial tension between oil and water phases through its amphiphilic structure—a hydrophobic C11-15 carbon chain paired with 12 hydrophilic ethylene oxide units. This molecular architecture allows it to stabilize oil-in-water emulsions while solubilizing lipophilic compounds like fragrances into aqueous bases. During cleansing, it forms micelles that encapsulate and lift sebum and impurities from the skin surface.


Research

High confidence
Effective range 0.3–1%
Optimal

0.3%

Key findings

  1. 01 CIR Safety Assessment demonstrating 0.3% maximum safe concentration for leave-on products
  2. 02 Patch testing at 1.0% in rinse-off formulations showing minimal irritation potential

Transparency

Not commonly dusted

Not typically subject to dusting practices due to its functional necessity as an emulsifier and surfactant rather than active ingredient status


The Formula

Solubility
Water
Optimal pH 3 – 11
0 7 14

Stability

Demonstrates exceptional stability across wide pH range and high-electrolyte environments. Non-ionic nature prevents reactions with most ionic ingredients, enhancing formula compatibility.

Synergies

  • Other non-ionic emulsifiers for enhanced stability
  • Compatible with most ionic and non-ionic ingredients

Conflicts

  • Strong oxidizing agents
  • High concentrations may reduce phenolic preservative efficacy through micellar encapsulation

Safety

CIR Status
Safe as used
Max tested
0.3%
Pregnancy
Safe
Sensitization risk Low

CIR Expert Panel approval with 0.3% limit for leave-on applications. Rinse-off products may safely contain up to 10-15% concentrations.


Your Skin

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

Our Assessment

Valuable

A reliable formulation workhorse offering excellent emulsification and gentle cleansing properties with broad skin type compatibility and exceptional stability.


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References