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SODIUM POLYACRYLATE STARCH.

Valuable / ABSORBENT, BINDING, EMULSION STABILISING, FILM FORMING, VISCOSITY CONTROLLING

Sodium Polyacrylate Starch is a high-performing superabsorbent polymer frequently used to enhance the texture and stability of cosmetic formulations. It functions by absorbing significant amounts of water to form a hydrating gel matrix on the skin's surface, simultaneously improving product consistency and skin hydration.

Summary

Absorbent Viscosity Controlling Emulsion Stabilizing Binding Film Forming Texture Enhancer Thickening Agent Humectant

Science

Mechanism of Action

Operating as a superabsorbent polymer, Sodium Polyacrylate Starch effectively absorbs 100 to 1000 times its own mass in water, thereby swelling to create a gel-like substance. Due to its substantial molecular size, this gel matrix forms a non-penetrating protective film on the skin's surface. This barrier actively reduces transepidermal water loss (TEWL), maintains the skin’s inherent moisture balance, and significantly enhances overall skin hydration by drawing and retaining moisture. Furthermore, it acts as an emulsifier and emulsion stabilizer, improving the product's consistency, spreadability, and potentially facilitating the surface-level delivery of smaller, water-soluble active ingredients by maintaining a hydrated microenvironment.

Research

Clinical Evidence

High confidence
Effective range 0.1–3%
Optimal

N/A

Key findings

  1. 01 Commonly used in cosmetic formulations between 0.1% and 3% concentration, Sodium Polyacrylate Starch enhances texture, provides a smooth feel, stabilizes emulsions, and forms a protective film on the skin. This action supports improved skin hydration and can contribute to the sustained delivery of active ingredients.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Exhibits good stability and viscosity, and related polymers show high heat resistance and mechanical stability. However, starch-graft polymers may demonstrate sensitivity and reduced absorption in the presence of high salt concentrations.

Synergies

  • Water-soluble active ingredients (by maintaining a hydrated surface environment for enhanced delivery)

Conflicts

  • High salt concentrations (potential for reduced absorption capacity and stability)

Safety

Safety Profile

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

The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Sodium Polyacrylate safe for cosmetic use, particularly within the typical 0.1% to 3% concentration range. Its large molecular size prevents skin penetration, minimizing systemic exposure. While generally non-irritating, a patch test is recommended for individuals with extremely sensitive skin.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Sodium Polyacrylate Starch is a valuable ingredient for its multifunctional benefits in enhancing formulation aesthetics, providing critical hydration, and ensuring product stability, with a strong safety profile across all skin types.

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