Sodium Polyacrylate ( Hydrogel ) - 25 000 = 25kg

Sodium Polyacrylate (Hydrogel)

Other Names: Superabsorbent polymer (SAP), Poly(acrylic acid sodium salt)
Chemical Formula (Repeating Unit): (C₃H₃NaO₂)ₙ
CAS Number: 9003-04-7
Appearance: White granular or powdery solid
Odor: Odorless

Sodium polyacrylate is a superabsorbent polymer (SAP) known for its ability to absorb and retain large amounts of water or aqueous solutions relative to its mass. It forms a gel-like material upon hydration and is widely used in moisture control, chemical spill containment, and industrial applications requiring high water retention.

Chemical and Physical Properties

• Molar Mass: Variable (high molecular weight polymer)

• Density: ~0.5–0.8 g/cm³ (bulk density)

• Solubility: Insoluble in water; swells to form a hydrogel

• Absorption Capacity: Up to 300–800 times its own weight in distilled water (depending on cross-link density)

• pH (1% solution): ~6.0–8.0 (mildly neutral to slightly alkaline)

• Thermal Stability: Stable under ambient conditions; decomposes at high temperatures

Applications

• Spill Containment: Used in chemical absorbent pads and granules to immobilize liquid spills.

• Cable and Wire Industry: Applied as a water-blocking agent in communication cables.

• Agriculture and Horticulture: Incorporated into soils or substrates to improve water retention.

• Waste Treatment: Utilized for solidifying liquid waste and improving handling.

• Research and Education: Demonstrated in studies involving hydrogels, polymer swelling, and osmosis.

Safety

Signal Word: ⚠️ Warning

Hazard Statements:

• H335: May cause respiratory irritation (inhalation of dust)

Precautionary Statements:

• P261: Avoid breathing dust

• P280: Wear protective gloves and eye protection

• P285: In case of inadequate ventilation, wear respiratory protection

• P501: Dispose of contents/container in accordance with local regulations

Handling and Storage

• Handling: Avoid generating dust. Use proper personal protective equipment in bulk handling situations.

• Storage: Keep container tightly sealed in a cool, dry place. Protect from moisture and direct sunlight.

Environmental Considerations

Not classified as hazardous to the environment in typical industrial use, but large-scale release into ecosystems should be avoided due to swelling behavior and potential for clogging waterways or drains.