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SODIUM POLYNAPHTHALENESULFONATE.

Valuable CAS 9084-06-4 / EMULSION STABILISING, GEL FORMING, SURFACTANT - CLEANSING, SURFACTANT - HYDROTROPE

Sodium Polynaphthalenesulfonate is a versatile cosmetic ingredient primarily functioning as an emulsion stabilizer, preventing the separation of oil and water phases to maintain product integrity. It also acts as a surfactant and hydrotrope, enhancing the solubility of various compounds and aiding in the uniform suspension of insoluble particles within liquid formulations.

Summary

emulsion stabilising surfactant hydrotrope suspending agent gel forming

Science

Mechanism of Action

On a molecular level, Sodium Polynaphthalenesulfonate operates by reducing interfacial tension between immiscible phases, effectively stabilizing emulsions. As a hydrotrope, it increases the water solubility of lipophilic or poorly soluble ingredients. Its surfactant properties also facilitate the uniform distribution and suspension of solid particles, contributing to consistent product texture and performance, and can assist in mild cleansing by lowering surface tension.

Research

Clinical Evidence

Medium confidence
Effective range 0.1–0.4%
Optimal

N/A

Key findings

  1. 01 Observed to effectively stabilize emulsions and function as a surfactant-hydrotrope or suspending agent in various cosmetic products, including lipsticks, within a 0.1%-0.4% concentration range.
  2. 02 Sodium Naphthalenesulfonate (SNS), a structurally related ingredient, demonstrated no irritant, cumulative irritant, or sensitizing effects when tested up to 2% in clinical studies.

Transparency

Dusting Analysis

Not commonly dusted

No data within the provided research indicates this ingredient is commonly associated with dusting concerns or has specific dusting thresholds.

The Formula

Formulation

Solubility
Water
Optimal pH 6 – 9
0 7 14

Stability

Exhibits robust stability across a broad range of conditions, including resistance to acidic, alkaline, and hard water environments. It maintains efficacy at high temperatures and demonstrates good diffusivity within formulations.

Conflicts

  • strong oxidizers
  • strong reducing agents
  • combustibles
  • organic materials

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
0.1%
Sensitization risk Low

Deemed safe for external skin applications by the CIR Expert Panel, particularly at low concentrations (up to 0.1% in leave-on products) due to minimal skin penetration. Its use is restricted in products intended for contact with mucous membranes or ingestion due to insufficient safety data. The formaldehyde residue content is 0.09%, which is below the 0.2% limit established by the CIR Expert Panel.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Sodium Polynaphthalenesulfonate is a valuable ingredient for enhancing product stability and texture in external cosmetic applications, offering low irritancy at recommended concentrations up to 0.1%.

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