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Moumoujus

STEARAMIDOETHYL DIETHYLAMINE.

Questionable CAS 16889-14-8 / ANTISTATIC, HAIR CONDITIONING

Stearamidoethyl Diethylamine is a cationic surfactant utilized for its emulsifying, emollient, conditioning, and antistatic properties in cosmetic formulations. Despite its versatile functions, research indicates it is a moderate sensitizer with reported instances of allergic contact dermatitis in humans, raising significant concerns for skin compatibility.

Summary

antistatic hair conditioning emulsifying agent emollient

Science

Mechanism of Action

This ingredient functions as a cationic surfactant, possessing a positive charge that enables it to electrostatically adsorb onto the naturally negatively charged surfaces of hair and skin. In formulations, it primarily acts as an emulsifying agent to enhance stability, and as an emollient, conditioner, and antistatic agent to improve product texture and hair manageability.

Research

Clinical Evidence

Insufficient-data 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

Exhibits cationic properties when neutralized, which can influence its behavior and interaction within a formulation.

Safety

Safety Profile

CIR Status
Insufficient data
Sensitization risk Moderate

The Cosmetic Ingredient Review (CIR) Expert Panel has not completed a specific safety assessment for Stearamidoethyl Diethylamine, classifying it under 'insufficient data'. While related 'Fatty Acid Amidopropyl Dimethylamines' are deemed safe when formulated to be non-sensitizing, this specific ingredient has been classified as a moderate sensitizer in guinea pig studies, with 30-40% of animals exhibiting sensitization at concentrations of 0.5-1%. Importantly, there are documented reports of it causing allergic contact dermatitis in humans. Furthermore, its chemical structure presents a potential for nitrosamine formation if not properly formulated. One supplier claims it 'does not cause skin irritation' and is 'gentle to eyes,' which likely refers to acute irritation rather than its established sensitization potential.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Questionable

Despite its functional properties, Stearamidoethyl Diethylamine is classified as a moderate sensitizer with documented human allergic contact dermatitis, rendering its use questionable for precision skincare formulations.

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