Sodium Polyacrylate

Product Description

Sodium Polyacrylate is a functional synthetic polymer celebrated in the B2B cosmetic sector for its extraordinary water-absorbing capacity—holding up to 200 to 500 times its own weight in water. While widely known as a Super Absorbent Polymer (SAP), its cosmetic grade is refined for sophisticated textural applications. It acts as a premier rheology modifier and film-former, capable of creating unique "transforming textures." Upon application to the skin, it releases held moisture instantly, creating a refreshing, cooling sensation. Unlike traditional thickeners that can feel heavy or sticky, Sodium Polyacrylate provides a soft, cushiony feel and leaves a smooth, velvety after-touch. It is the backbone material for hydrogel technology, offering formulators the ability to create solid gel structures that adhere perfectly to the skin while delivering sustained hydration.

Product Uses

The primary application for cosmetic-grade Sodium Polyacrylate is in the manufacturing of Hydrogel Masks and patch technologies (such as under-eye patches and cooling fever strips). Its ability to crosslink and form a solid, elastic gel sheet that holds vast amounts of serum makes it indispensable for this category. In skincare creams and emulsions, it is the secret behind the popular "Water-Drop" or "Water-Burst" creams. In these formulations, the polymer stabilizes the oil phase but breaks quickly upon rubbing, releasing visible water droplets on the skin for a dramatic sensory experience. It is also used as a stabilizer and thickener in hair styling gels and conductive gels for beauty devices.

Formulation Suggestions

Sodium Polyacrylate is extremely hydrophilic. To avoid clumping (fish-eyes), it should be dispersed in a non-solvent (like glycerin or glycol) before adding water, or added slowly to the vortex of high-speed agitation. It creates high-viscosity gels immediately upon hydration without the need for neutralization. However, formulators must be aware that this polymer is highly sensitive to electrolytes (salts). The presence of high concentrations of ions (from active ingredients or botanical extracts) can cause a significant drop in viscosity or prevent the gel from forming. For salt-heavy formulas, a salt-tolerant grade or alternative thickener may be required. Recommended usage levels range from 0.2% to 1.0% for creams and up to 5.0% - 10.0% for solid hydrogel patches. Our recommendations are for reference only; please follow the advice of your formulator for actual production.

Product Specification

• INCI Name: Sodium Polyacrylate
• Synonyms: Acrylic Acid Sodium Salt Polymer, Super Absorbent Polymer (SAP)
• CAS No.: 9003-04-7
• Molecular Formula: (C₃H₃NaO₂)_n
• Appearance: White granular powder or fine powder
• Purity: ≥99%
• Solubility: Swells in water to form a gel; insoluble in ethanol and oils.
• Stability: Hygroscopic. Stable in neutral to high pH. Sensitive to electrolytes.
• Properties: Super-absorbent, Film-forming, Emulsifying, Texture-modifying
• Origin: China