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POLYQUATERNIUM-39.

Valuable CAS 25136-75-8 / ANTISTATIC, FILM FORMING

Polyquaternium-39 is a versatile cationic polymer primarily utilized in skincare for its exceptional conditioning and moisturizing properties. It forms a delicate, flexible film on the skin, delivering a silky feel and enhancing product lubricity while actively reducing post-drying tightness.

Summary

Antistatic Film-forming Skin Conditioning

Science

Mechanism of Action

This ingredient functions as a cationic polymer, carrying a positive charge that allows it to ionically bond with the negatively charged surface of the skin. This interaction neutralizes static charges, forms a thin, protective film, and effectively locks in moisture. The resultant film contributes to a smooth, velvety texture, minimizes skin tightness, and improves the spreadability of cosmetic formulations.

Research

Clinical Evidence

High confidence
Effective range 0.5–3%
Optimal

1.5%

Key findings

  1. 01 Clinical evaluations demonstrate that concentrations up to 3% in leave-on and rinse-off formulations provide significant conditioning and moisturization benefits.
  2. 02 A starting concentration of 1.5% is suggested for skincare applications to impart a smooth, velvety skin feel, reduce feelings of tightness, and enhance lubricity.
  3. 03 Usage between 0.5% and 5% reliably improves conditioning and moisture retention in both haircare and skincare systems.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 5.5 – 7.3
0 7 14

Stability

Polyquaternium-39 exhibits excellent stability across a wide pH range of 3 to 12. For optimal shelf life, store in a cool, dry, sealed environment, protected from strong oxidizing agents.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
3%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Polyquaternium-39 is safe for use in cosmetic formulations at concentrations up to 3%. Studies, including rabbit skin irritation (PII = 0) and human repeat insult patch tests (HRIPT), classified it as a non-irritant and non-sensitizer. Residual monomer levels (acrylamide <1 ppm, acrylic acid <50 ppm, dimethyldiallyl ammonium chloride <2%) were found to be negligible and not toxicologically concerning.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Polyquaternium-39 is a highly valuable ingredient for its robust skin conditioning, moisturizing, and film-forming capabilities, offering broad skin compatibility and a strong safety profile at effective concentrations.

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