Science
Mechanism of Action
As a super-absorbent polymer, Sodium Polyacrylate functions by creating a hydrating, protective film on the skin's surface. It achieves this by absorbing and retaining an impressive 100 to 1000 times its mass in water, thereby effectively maintaining skin hydration. Its substantial molecular size ensures it does not penetrate the skin. This hydrated surface environment indirectly facilitates the more effective penetration and delivery of smaller, water-soluble active ingredients. Furthermore, it serves as a robust thickening, gelling, stabilizing, and film-forming agent, contributing significantly to improved texture, viscosity, and overall consistency of cosmetic products.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 At concentrations of 0.1-2%, it thickens moisturizers and creams, yielding a smooth, rich texture and enhancing moisture retention on the skin.
- 02 Within the 0.1-2% range in lotions, it stabilizes formulations, ensuring uniform consistency and preventing ingredient separation.
- 03 In gel-based products, at 0.5-3%, it effectively provides desired viscosity and maintains gel structure.
- 04 Used at 0.1-1% in sunscreens, it facilitates even dispersion of active ingredients, thereby enhancing product stability and application.
- 05 At lower concentrations (0.1-0.5%) in serums, it refines consistency and supports the effective delivery of active ingredients.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Sodium Polyacrylate can be cold-processed, which streamlines production efficiency. Its fine gel structure ensures optimal formulation stability across various temperatures. It demonstrates compatibility with a broad spectrum of ingredients and formulations, capable of reducing or even replacing traditional consistency-giving factors and emulsifying agents, thus enabling the creation of oil-free systems without additional emulsifiers.
Synergies
- Compatible with a wide range of cosmetic ingredients and formulations.
- Can reduce or replace traditional emulsifiers, facilitating oil-free product development.
- Enhances formulation stability across various temperatures.
Conflicts
- High levels of residual acrylic acid (exceeding 300 PPM) can cause skin irritation.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Sodium Polyacrylate is safe for use in cosmetics at typical concentrations (0.1% to 3%) when formulated to be non-irritating. Global regulatory bodies, including the European Cosmetics Regulation and the US FDA, also approve its safety for cosmetic applications. While generally well-tolerated, individuals with extremely sensitive skin or pre-existing skin conditions may experience minor irritation such as redness, itching, or a slight burning sensation, making a patch test advisable. To prevent skin rashes, residual acrylic acid from the manufacturing process must be maintained below 300 PPM.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sodium Polyacrylate is a valuable multifunctional ingredient, offering significant benefits in product formulation by enhancing texture, stability, and delivering measurable improvements in skin hydration and active ingredient efficacy.
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