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STEARAMIDOPROPYL DIMETHYLAMINE STEARATE.

Valuable / ANTISTATIC, HAIR CONDITIONING, SURFACTANT - EMULSIFYING

Stearamidopropyl Dimethylamine Stearate is a sophisticated cationic compound primarily utilized for its emulsifying, conditioning, and antistatic properties. It expertly blends immiscible components, like oil and water, enhancing product stability and texture within formulations.

Summary

Antistatic Emulsifying Hair Conditioning Surfactant

Science

Mechanism of Action

This ingredient functions as a highly substantive cationic emulsifier, plasticizer, and surfactant. It creates stable emulsions by forming hydrogen bonds with water molecules, establishing a robust hydrophobic barrier that prevents the interaction of disparate solution components. Its cationic nature allows it to deposit a monomolecular layer on surfaces, contributing to its conditioning and antistatic effects.

Research

Clinical Evidence

Medium confidence
Effective range 0.01–5%
Optimal

N/A

Key findings

  1. 01 Typical usage levels of Stearamidopropyl dimethylamine (the amine component) between 0.01% and 5% are deemed safe by the Cosmetic Ingredient Review Expert Panel.
  2. 02 Stearamidopropyl dimethylamine in personal care products demonstrated non-irritating effects in several in-use studies at a concentration of 0.045%.
  3. 03 At a 2% concentration in hair conditioners, Stearamidopropyl dimethylamine was not identified as a contact sensitizer, though irritation reactions were observed for the broader group of fatty acid amidopropyl dimethylamines.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH 3.5 – 6.5
0 7 14

Stability

For optimal emulsifying viscosity, Stearamidopropyl Dimethylamine requires a low pH, ideally between 3.5 and 4.0, as viscosity significantly decreases above pH 4.2. When used as a co-emulsifier in skincare, the water phase pH should range from 5.5 to 6.5. For cleanser formulations, a pH closer to 6.0-6.5 is recommended. It effectively reduces static under acidic conditions.

Conflicts

  • Anionic (negatively charged) ingredients may present compatibility issues, particularly at low pH.
  • Formulation conditions that could lead to the formation of nitrosamines must be strictly avoided.

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
5%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel concluded that fatty acid amidopropyl dimethylamines (including Stearamidopropyl dimethylamine) are safe as cosmetic ingredients when formulated in a non-sensitizing manner, with restrictions on concentration, impurities, or product types. It is explicitly considered unsafe for products designed to be left on the skin and not rinsed off. A maximum impurity level of 0.65 ppm of DMAPA is recommended in finished products containing 2.14% Stearamidopropyl dimethylamine, and formulations must prevent nitrosamine formation. Stearamidopropyl dimethylamine stearate itself is generally recognized as non-toxic, non-irritating, and non-allergenic.

Your Skin

Skin Compatibility

Yes Normal
No Dry
No Oily
No Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Stearamidopropyl Dimethylamine Stearate is a valuable cationic ingredient for stabilizing formulations and conditioning, particularly suitable for rinse-off applications due to specific CIR safety considerations regarding its use in leave-on products.

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