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STEARAMIDOETHYL DIETHANOLAMINE.

Questionable CAS 55819-54-0 / ANTISTATIC, HAIR CONDITIONING

Stearamidoethyl Diethanolamine is a versatile compound recognized for its antistatic and hair conditioning properties. In skincare formulations, it additionally functions as an emulsifier and surfactant, though its inclusion necessitates strict adherence to specific safety and regulatory guidelines.

Summary

Antistatic Hair conditioning Emulsifier Surfactant

Science

Mechanism of Action

This ingredient primarily acts as an antistatic and hair conditioning agent, developing cationic characteristics upon neutralization. It also serves to stabilize emulsions as an emulsifier and reduce surface tension as a surfactant, aiding in product texture and spreadability.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

The ingredient exhibits cationic properties when neutralized. While precise optimal pH for stability is not explicitly stated, related diethanolamides typically perform effectively within alkaline to neutral pH ranges, such as Myristamide DEA's reported pH of 9.5-10.5 for a 10% aqueous dispersion.

Conflicts

  • Nitrosating agents (e.g., nitrites) due to potential formation of carcinogenic N-nitrosamines.

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
0.5%
Sensitization risk Moderate

The Cosmetic Ingredient Review (CIR) Expert Panel considers this ingredient safe for use when formulated to be non-irritating and when N-nitroso compounds cannot be formed. European Union Cosmetics Directive guidelines specify that products containing dialkanolamides (a category including Stearamidoethyl Diethanolamine) must ensure the finished product's maximum secondary amine content is 0.5%, the raw material's secondary amine content does not exceed 5%, and nitrosamine content is below 50 µg/kg. Products must also be housed in nitrite-free containers. It is critical to note that diethanolamine, a component of this ingredient, is listed on California's Proposition 65 as a known carcinogen. Animal studies have also indicated a moderate potential for sensitization.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy Medium
Comedogenicity Unknown

Our Assessment

Verdict

Questionable

While offering functional benefits as an emulsifier and surfactant, the significant safety restrictions, including potential N-nitrosamine formation, California Proposition 65 listing for a component, and moderate sensitization risk, render Stearamidoethyl Diethanolamine a questionable ingredient for precision skincare formulations.

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