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ARACHIDETH-42.

Valuable CAS 26636-39-5 / SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

A high-HLB, non-ionic surfactant and emulsifier derived from fatty alcohols, designed to integrate oil and water phases into seamless emulsions. It is prized in precision skincare for its ability to stabilize complex formulas while maintaining a gentle, non-reactive profile on the skin barrier.

surfactant cleansing emulsifying solubilizing

Science

Functions as an oil-in-water (O/W) emulsifier with a high hydrophilic-lipophilic balance (HLB) of approximately 17.2. It works by reducing interfacial tension, allowing microscopic oil droplets to remain uniformly suspended in an aqueous base, while simultaneously aiding in the solubilization of lipophilic debris during cleansing.


Research

High confidence
Effective range 0.5–10%
Optimal

5%

Key findings

  1. 01 2012 Cosmetic Ingredient Review (CIR) Safety Assessment: Human Repeat Insult Patch Tests (RIPT) on the Arachideth series confirmed the ingredient is non-sensitizing and non-irritating at typical use concentrations of 5%.

Transparency

Not commonly dusted
Min. effective
0.5%
Red flag below
0.1%

As a functional structural ingredient rather than a 'hero' active, Arachideth-42 is rarely used for marketing 'dusting' and is typically included at the precise levels required for emulsion stability.


The Formula

Solubility
Water
Optimal pH 3 – 11
0 7 14

Stability

Highly robust across a broad pH and temperature spectrum; its ether-linked chemical structure provides significant resistance to hydrolysis and oxidative degradation.

Synergies

  • Lipophilic active ingredients
  • O/W emulsions
  • Micellar systems

Safety

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

The CIR Expert Panel concluded it is safe for cosmetic use when formulated to be non-irritating. It remains unrestricted by the EU Cosmetics Regulation and the FDA.


Your Skin

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

Our Assessment

Valuable

An exceptionally stable and safe emulsifying agent that ensures structural integrity and elegant texture in high-performance skincare.


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