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POLYHYDROXYSTEARAMIDOPROPYL DIMETHYLAMINE.

Insufficient Data CAS - / SURFACTANT - CLEANSING

While POLYHYDROXYSTEARAMIDOPROPYL DIMETHYLAMINE lacks a widely recognized INCI designation, the provided research specifically details Stearamidopropyl Dimethylamine, a related compound. This ingredient is predominantly utilized in hair care formulations, acting as a cationic conditioner to enhance hair manageability and texture.

Summary

antistatic hair conditioning emulsifying surfactant

Science

Mechanism of Action

Stearamidopropyl Dimethylamine functions as a cationic surfactant. When formulated under acidic conditions and neutralized with an acid (e.g., lactic acid), it transforms into a quaternary ammonium compound. This positively charged entity then binds to the negatively charged hair cuticle, effectively smoothing the hair surface, mitigating static electricity, and significantly improving both wet and dry combability. Furthermore, it contributes to hair's natural shine and softness, and can serve as a biodegradable, non-occlusive film-forming alternative to silicones.

Research

Clinical Evidence

Medium confidence
Effective range 0.01–5%
Optimal

2.3%

Transparency

Dusting Analysis

Not commonly dusted

There is no evidence to suggest this ingredient is subject to 'dusting' or exaggerated marketing claims within the skincare industry, particularly given its primary use and research focus in hair care formulations.

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Optimal function as a cationic conditioner and emulsifier requires neutralization with an acid, such as lactic acid, within an acidic pH environment. It demonstrates excellent emulsifying and thickening capabilities and is compatible with various cosmetic raw materials, including anionic surfactants when appropriately formulated.

Safety

Safety Profile

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

The CIR Expert Panel concluded that fatty acid amidopropyl dimethylamines, including Stearamidopropyl Dimethylamine, are safe for cosmetic use provided formulations are non-sensitizing. This mandates stringent control over known sensitizing impurities such as Dimethylaminopropylamine (DMAPA) and 'amidoamine'. While raw material GHS classifications may indicate potential for skin burns or eye damage, these typically apply to the concentrated form, not finished cosmetic products formulated within safe limits (e.g., 2.3% use with DMAPA levels around 2.65 ppm).

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Insufficient Data

The research exclusively pertains to Stearamidopropyl Dimethylamine's benefits in hair conditioning and surfactant roles, offering no direct data to assess the efficacy or compatibility of POLYHYDROXYSTEARAMIDOPROPYL DIMETHYLAMINE for precision skincare applications.

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