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BUTOXYNOL-19 CARBOXYLIC ACID.

Valuable CAS 104909-82-2 / CLEANSING, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

A sophisticated hybrid surfactant that adapts its ionic behavior based on formulation pH, delivering gentle yet effective cleansing without traditional soap harshness. This polyoxyethylene-based ingredient creates a flexible protective film on skin while maintaining excellent stability across diverse formulation conditions.

surfactant cleansing agent emulsifying agent barrier enhancer

Science

Functions as a dual-action anionic/non-ionic surfactant that reduces interfacial tension between water and oils to facilitate emulsion formation. Its 18-19 mole polyoxyethylene chain structure enables formation of a continuous, flexible barrier film on skin surfaces while adjusting ionic character responsively to pH changes for optimal cleansing efficacy.


Research

Medium confidence
Effective range 0.1–10%
Optimal

2.5%

Key findings

  1. 01 Patent studies demonstrate water-resistant barrier formation and enhanced conditioning when combined with polyamines at 0.1-10% concentrations
  2. 02 Research at 0.5-5% shows effective stabilization of antimicrobial formulations with excellent skin tolerance

Transparency

Not commonly dusted

Primarily used as a functional surfactant in cleansing formulations rather than as a marketing ingredient


The Formula

Solubility
Water
Optimal pH 2 – 12
0 7 14

Stability

Exceptional pH stability range with pKa around 4.0-4.5; resistant to precipitation in hard water and acidic conditions unlike conventional fatty acids

Synergies

  • polyamines for enhanced conditioning

Conflicts

  • highly concentrated electrolytes
  • strong oxidizing agents

Safety

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

Reviewed under Alkyl Ether Carboxylic Acids group; concentrated raw material shows irritation potential but is mitigated in diluted cosmetic applications


Your Skin

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

Our Assessment

Valuable

A versatile, gentle surfactant offering superior pH stability and skin compatibility for sophisticated cleansing formulations.


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