In the ever-evolving world of cosmetics, ingredients that enhance product performance, stability, and sensory appeal are in high demand. One such standout material is Sodium Polyacrylate (CAS No. 9003-04-7), a super absorbent polymer (SAP) valued for its remarkable ability to retain moisture, improve texture, and stabilize formulations.
What Is Sodium Polyacrylate?
Sodium polyacrylate is the sodium salt of polyacrylic acid, known chemically as 2-Propenoic acid, homopolymer, sodium salt. It is widely used in cosmetic and personal care applications due to its superior water-absorbing capabilities—absorbing 100 to 1000 times its own weight in water.
Basic Technical Profile
| Item | Details |
|---|---|
| INCI Name | Sodium Polyacrylate |
| CAS Numbers | 9003-04-7 / 25549-84-2 / 7446-81-3 / 28603-11-4 |
| Chem/IUPAC Name | 2-Propenoic acid, homopolymer, sodium salt |
| EINECS/ELINCS No | 618-349-8 |
| COSING REF No | 79997 |
| Appearance | White powder or granules |
| Solubility | Insoluble in water (forms gel upon hydration) |
| Boiling Point | 141°C |
| Melting Point | >150°C |
| Absorption Capacity | 100–1000 times its own weight in water |
| Production Method | Polymerization of acrylic acid, neutralized with sodium hydroxide |
| Safety Status | Approved for cosmetic use by the CIR (Cosmetic Ingredient Review) panel |
How Does It Work?
Sodium polyacrylate absorbs water through osmotic swelling. When it comes into contact with moisture, sodium ions in the polymer attract water molecules, causing the polymer to expand and form a gel-like network. This unique behavior allows it to lock in water and enhance hydration in cosmetic formulations.
Functions in Cosmetic Formulations
In cosmetics, sodium polyacrylate serves several essential purposes, each contributing to product performance and sensory feel.
Functional Properties in Formulations
| Function | Benefit in Cosmetics |
|---|---|
| Absorbent | Enhances water retention and hydration |
| Viscosity Controlling | Improves texture, flow, and spreadability |
| Emulsion Stabilizing | Prevents separation of oil and water phases |
| Film Forming | Creates a protective barrier on skin or hair |
| Hair Fixing | Provides hold and structure in styling products |
| Skin Conditioning | Softens and smoothens the skin texture |
These properties make it highly valuable in products such as:
-
Moisturizing creams and lotions
-
Body care formulations
-
Hair gels and styling products
-
Serums and primers
-
Sheet masks and other water-based treatments
Applications Across Industries
Beyond cosmetics, sodium polyacrylate is used in multiple industries:
-
Agriculture: As a water-retaining resin to improve soil moisture
-
Packaging: To prevent moisture damage in sensitive products
-
Industrial: In oil drilling and wastewater treatment applications
This versatility highlights the polymer’s ability to perform in diverse environments.
Formulation Compatibility and HSP Insights
In formulation science, Hansen Solubility Parameters (HSP) help ensure sodium polyacrylate is compatible with other ingredients. This method supports:
-
Efficient ingredient matching and solubility testing
-
Optimized delivery of active substances
-
Faster product development cycles
-
Stable dispersion of polymers in skin care or nail products
Conclusion
Sodium Polyacrylate is a high-performance ingredient that combines moisture absorption, texture enhancement, and formulation stability—making it a go-to choice in the creation of premium cosmetic products.
Whether you’re formulating a hydrating serum or designing a long-lasting styling gel, sodium polyacrylate delivers reliable results with a proven safety profile.
Need help incorporating sodium polyacrylate into your formulation?
Contact us today for samples, formulation guidance, or product support.
English (South Africa) 
English 
Deutsch 
Español 
Français 
Русский 
日本語 
العربية 
Italiano 
한국어 
Tiếng Việt 
简体中文 
Dansk 
हिन्दी 
Suomi 
Íslenska 
Bahasa Indonesia 
English (Australia) 
English (Canada) 
English (New Zealand) 
香港中文 
繁體中文