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C11-21 PARETH-10.

Valuable CAS 246538-82-9 / SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

A gentle non-ionic surfactant that effectively cleanses skin by reducing surface tension between oil and water phases. This versatile emulsifier allows impurities and sebum to be easily suspended and removed while maintaining low irritation potential across all skin types.

cleansing emulsifying surfactant

Science

Functions as a surface-active agent that decreases interfacial tension between oil and water, enabling efficient removal of debris, sebum, and environmental pollutants while facilitating stable emulsion formation in skincare formulations


Research

High confidence
Effective range 0.1–10%
Optimal

2.5%

Key findings

  1. 01 Patch testing on 3,186-6,202 patients demonstrated exceptionally low sensitization rates of 0.25%-0.34% for related alkyl PEG ethers at 0.5-3.0% concentrations
  2. 02 High-concentration dermal studies (10-25%) on analogous pareth compounds showed only negligible to slight irritation, confirming excellent skin tolerance

Transparency

Not commonly dusted

As a functional surfactant with established safety data, this ingredient is typically used at effective concentrations rather than being subject to dusting practices


The Formula

Solubility
Water
Optimal pH 3 – 11
0 7 14

Stability

Demonstrates exceptional pH stability due to non-ionic structure, with optimal performance at skin-neutral pH 4.5-5.5. Shows superior resistance to hard water compared to ionic surfactants

Conflicts

  • Strong oxidizing agents
  • High electrolyte concentrations

Safety

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

CIR assessment of 131 alkyl PEG ethers supports safety when formulated to minimize irritation. Leave-on products typically use 0.1-5%, while rinse-off formulations may contain up to 10%


Your Skin

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

Our Assessment

Valuable

A well-tolerated, effective cleansing agent with broad pH stability and universal skin type compatibility, making it a reliable choice for gentle yet thorough cleansing formulations.


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