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C9-11 PARETH-8 CARBOXYLIC ACID.

Valuable CAS 174125-27-0 / CLEANSING, SURFACTANT - CLEANSING

A sophisticated, high-performance ether carboxylic acid that bridges the gap between effective cleansing and barrier preservation. It serves as an ultra-mild anionic surfactant designed specifically for formulas where maintaining the skin's acidic mantle is a priority.

Surfactant Cleansing Agent Emulsifier Irritation Buffer

Science

This molecule utilizes an ethoxylated chain attached to a carboxylic acid head group. Its unique structure creates a large molecular size that prevents it from penetrating the stratum corneum; instead, it remains on the surface to emulsify impurities without denaturing skin proteins or stripping essential lipids.


Research

High confidence
Effective range 1–10%
Optimal

5%

Key findings

  1. 01 Comparative analysis indicates significantly lower protein swelling and adsorption into the skin barrier compared to traditional Sodium Laureth Sulfate (SLES).
  2. 02 Demonstrated efficacy as a co-surfactant to mitigate the irritation potential of primary detergents while enhancing overall skin compatibility.

Transparency

Not commonly dusted
Min. effective
1%
Red flag below
0.5%

Because it is a functional surfactant rather than a 'hero' active, it is rarely used at 'dusting' levels. However, concentrations below 1% may not provide significant cleansing or irritation-buffering benefits.


The Formula

Solubility
Water
Optimal pH 3 – 12
0 7 14

Stability

Exhibits exceptional stability against hydrolysis in extreme pH environments and maintains consistent performance even in hard water conditions.

Synergies

  • Anionic surfactants
  • Non-ionic surfactants
  • Amphoteric surfactants

Conflicts

  • Strongly cationic polymers
  • High-concentration mineral salts

Safety

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

Generally regarded as non-sensitizing and safe for rinse-off and leave-on applications when formulated to be non-irritating.


Your Skin

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

Our Assessment

Valuable

An elite cleansing agent for sensitive skin that provides effective purification without compromising the integrity of the skin barrier.


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