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SODIUM OLEOYL ISETHIONATE.

Valuable CAS 142-15-4 / ANTISTATIC, CLEANSING, FOAMING, HAIR CONDITIONING, SURFACTANT - CLEANSING

Sodium Oleoyl Isethionate is an anionic surfactant derived from fatty acids, renowned for its gentle yet effective cleansing properties. It excels at emulsifying oils and dirt, facilitating their removal without compromising the skin's natural lipid barrier. This ingredient also provides valuable foaming and conditioning benefits to formulations.

Summary

Antistatic Cleansing Foaming Hair Conditioning Surfactant - Cleansing

Science

Mechanism of Action

As a surfactant, Sodium Oleoyl Isethionate significantly lowers the surface tension between immiscible liquids (like oil and water) or between liquids and solids. This action allows it to effectively emulsify sebum, dirt, and other impurities, making them readily washable from the skin and hair. Critically, it performs this cleansing action while helping to preserve the skin's inherent moisture barrier, thereby avoiding the stripping sensation often associated with harsher cleansing agents. It further contributes antistatic, foaming, and hair conditioning properties.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

Sodium Oleoyl Isethionate is a foundational ingredient for cleansing and foaming, not typically 'dusted' for specific active claims, but rather included for its functional surfactant properties.

The Formula

Formulation

Solubility
Water
Optimal pH 6 – 8
0 7 14

Stability

Isethionate salts, including Sodium Oleoyl Isethionate, maintain stability within a pH range of 6.0 to 8.0. Exposure to pH values outside this specific range can lead to hydrolysis, compromising ingredient integrity. While water-soluble, it exhibits limited solubility at higher concentrations and may not dissolve readily, particularly in liquid formulations. Formulators can enhance dissolution in liquid systems by combining it with liquid amphoteric surfactants and applying heat. This characteristic makes it notably well-suited for solid or bar-type formulations.

Synergies

  • Liquid amphoteric surfactants (to improve dissolution in liquid formulations)

Conflicts

  • pH outside 6.0-8.0 (leads to hydrolysis)

Safety

Safety Profile

CIR Status
Safe as used
Max tested
50% in rinse-off, 17% in leave-on%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has deemed isethionate salts, including Sodium Oleoyl Isethionate, safe for cosmetic use within current industry practices and concentrations, provided they are formulated to be non-irritating. The established maximum concentrations (50% in rinse-off products and 17% in leave-on products) are primarily derived from the safety assessment of the closely related Sodium Cocoyl Isethionate and are generally considered applicable to the entire group of isethionate salts.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Sodium Oleoyl Isethionate is a valuable, mild anionic surfactant suitable for a wide array of cleansing and conditioning products, offering effective impurity removal while supporting skin barrier integrity across all skin types.

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