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C11-15 PARETH-7 CARBOXYLIC ACID.

Valuable CAS 246159-57-9 / CLEANSING, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

A gentle anionic surfactant that bridges the gap between effective cleansing and skin compatibility through its unique ether carboxylate structure. This pH-adaptive ingredient transforms from a mild emulsifier in acidic conditions to an efficient cleanser in neutral environments, making it particularly valuable for sensitive skin formulations.

cleansing surfactant emulsifying

Science

Functions through a polyoxyethylene chain (PEG-7) structure that connects lipophilic C11-15 alkyl groups with hydrophilic carboxylate groups, enabling surface tension reduction for cleansing while maintaining stability in hard water. Its dual-nature chemistry allows pH-dependent behavior: acting as a non-ionic emulsifier in acidic conditions and as an anionic surfactant in neutral to alkaline environments.


Research

High confidence
Effective range 1–10%
Optimal

3%

Key findings

  1. 01 CIR patch testing demonstrated minimal erythema at concentrations up to 10%, showing superior gentleness versus traditional sulfates
  2. 02 Co-surfactant studies at 1-3% concentrations proved effective irritancy reduction while preserving foam quality

Transparency

Not commonly dusted

Not typically subject to dusting as it serves essential cleansing and emulsifying functions rather than marketing claims


The Formula

Solubility
Both
Optimal pH 4.5 – 7.5
0 7 14

Stability

Exceptionally stable across pH 2.0-10.0 range with functional transformation rather than degradation at pH extremes

Synergies

  • Other mild surfactants for enhanced cleansing systems
  • Active ingredient carriers for improved skin deposition

Conflicts

  • Strong cationic surfactants
  • N-nitrosating agents

Safety

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

Manufacturing purity critical: 1,4-dioxane and ethylene oxide must be controlled below 1 ppm. Avoid combination with nitrosating agents.


Your Skin

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

Our Assessment

Valuable

A scientifically sound choice for formulators seeking effective yet gentle cleansing with broad skin type compatibility and excellent formulation stability.


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References