What is Sodium Polyacrylate CAS 9003-04-7?

Sodium Polyacrylate, also called PAAS, is a sodium salt polymer of acrylic acid with the repeat-unit formula (C3H3NaO2)n and CAS 9003-04-7. Depending on molecular weight and crosslinking, it can act as a dispersant, thickener, or superabsorbent polymer.

How does molecular weight or crosslinking change the behavior of Sodium Polyacrylate?

Low-molecular-weight linear grades usually act as dispersants and scale inhibitors. High-molecular-weight linear grades thicken aqueous systems, while cross-linked grades become water-swellable superabsorbent polymers rather than soluble thickeners.

Can Sodium Polyacrylate be used as an industrial thickener?

Yes. Its polyelectrolyte character lets it increase viscosity and stabilize water-based systems such as paints, coatings, cleaners, and emulsions. The right molecular weight and neutralization level should be selected for the target rheology.

How is Sodium Polyacrylate used in water treatment and detergents?

In cooling water, boilers, and circulating systems, low-MW sodium polyacrylate disperses scale-forming salts and helps prevent deposition. In detergents, it supports soil dispersion and anti-redeposition performance.

Which applications require cross-linked Sodium Polyacrylate?

Cross-linked sodium polyacrylate is used where water absorption and retention are important, such as diapers, sanitary products, agricultural water-retention materials, and spill-control or gelling applications. It swells instead of dissolving in water.

Sodium Polyacrylate CAS 9003-04-7

Sodium Polyacrylate CAS 9003-04-7 is a functional polyelectrolyte polymer chemically defined as the sodium salt of polyacrylic acid , functioning primarily as a superabsorbent material in hygiene products and a scale inhibitor in industrial water treatment. Also known as Acrylic acid sodium salt polymer or PAAS, this hygroscopic white powder (or liquid solution) is utilized to solidify liquid waste in sludge treatment and serves as a high-capacity water retention agent in agricultural hydrogels. We provide professional access to this material with competitive factory pricing and the ability to meet customized specifications (such as cross-linking density or molecular weight) for various manufacturing requirements. Our commitment to technical transparency ensures that every shipment is accompanied by comprehensive MSDS, TDS, COA documentation to support your quality assurance protocols, and we maintain capacity for consistent bulk supply to facilitate large-scale industrial operations.

CAS: 9003-04-7
Synonyms: Polyacrylic acid sodium salt, Sodium poly-2-propene-1-oate, Acrylic acid sodium salt polymer, PAAS, Sodium polyacrylate homopolymer
Einecs: 692-137-3
Molecular Formula: (C3H3NaO2)n
Grade: feed additives
Package: 25kg/bag (Plastic woven bag with PE liner) or 500kg/1000kg Jumbo Bag.

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Product Description

1 Physical & Chemical Properties

2 Key Application Fields

3 Safety and Precautionary Measures

4 Storage and Handling Conditions

Physical & Chemical Properties

Because CAS 9003-04-7 covers a range of molecular weights (from low-weight liquids to high-weight cross-linked powders), specifications can vary. Below are the typical properties for the standard industrial solid/powder grade.

Property	Specification
Chemical Name	Sodium Polyacrylate (PAAS)
CAS Number	9003-04-7
Appearance	White powder, granules, or clear/amber liquid
Solid Content	≥ 90% (Powder) / 30-50% (Liquid)
pH Value (1% solution)	6.0 – 9.0 (Neutral to Mildly Alkaline)
Solubility	Highly soluble in water; Insoluble in organic solvents
Molecular Weight	Customizable (Low MW for dispersion; High MW for thickening/absorption)
Stability	Stable under normal temperature and pressure

Key Application Fields

The magic of Sodium Polyacrylate lies in its adaptability. We supply varying grades tailored to these specific industries:

1. Water Treatment & Industrial Circulating Systems (Low Molecular Weight) In cooling water systems and boilers, Sodium Polyacrylate acts as an exceptional scale inhibitor and dispersant. It prevents calcium carbonate and calcium sulfate crystals from adhering to pipes, significantly improving heat transfer efficiency and reducing maintenance costs.

2. Detergents and Cleaning Agents (Low to Medium Molecular Weight) It is a crucial ingredient in laundry detergents and dishwashing liquids. It functions as an anti-redeposition agent, ensuring that dirt lifted from clothes or dishes is suspended in the water and rinsed away, rather than settling back onto the surface.

3. Paper and Textile Processing Used as a pigment dispersant, it helps lower the viscosity of coating mixtures (like calcium carbonate slurries), allowing for faster, smoother production runs.

4. Superabsorbent Polymers (SAP) / Hygiene (Cross-linked / High Molecular Weight) For the hygiene industry (diapers, sanitary pads) and agriculture (water retention crystals), we offer the cross-linked form. This version absorbs rapidly and retains water under pressure, transforming liquids into a stable gel.

5. Drilling Fluids In the oil and gas sector, it serves as a fluid loss control agent and viscosity modifier, helping to stabilize the borehole.

Safety and Precautionary Measures

Sodium Polyacrylate is generally considered low-toxicity and safe for industrial handling, but physical safety is the primary concern.

Slip Hazard: This is the most critical safety note. When Sodium Polyacrylate powder mixes with even a tiny amount of water (spilled on the floor), it becomes extremely slippery. Spills should be cleaned up dry (sweeping or vacuuming) before washing the area.
Respiratory Protection: Like any fine powder, inhalation should be avoided. Operators should wear dust masks (N95) during handling.
Eye Contact: Wear safety goggles. If dust enters the eyes, flush with plenty of water.

For an alternative polymeric scale-inhibitor option in water-treatment systems, see Sodium Polyaspartate (PASP).

Storage and Handling Conditions

To maintain the product’s efficacy—especially for powder grades—proper storage is non-negotiable.

Moisture Control: The product is hygroscopic (it loves to absorb moisture from the air). Keep bags/drums tightly sealed immediately after use.
Environment: Store in a cool, dry, and well-ventilated warehouse.
Packaging: Typically available in 25kg paper bags with PE liners or bulk bags. Ensure the liner is intact to prevent cumping.
Shelf Life: Generally 12-24 months if kept dry.

FAQ - Technical & Supply Chain

Q:
What is Sodium Polyacrylate CAS 9003-04-7?

A: Sodium Polyacrylate, also called PAAS, is a sodium salt polymer of acrylic acid with the repeat-unit formula (C3H3NaO2)n and CAS 9003-04-7. Depending on molecular weight and crosslinking, it can act as a dispersant, thickener, or superabsorbent polymer.
Q:
How does molecular weight or crosslinking change the behavior of Sodium Polyacrylate?

A: Low-molecular-weight linear grades usually act as dispersants and scale inhibitors. High-molecular-weight linear grades thicken aqueous systems, while cross-linked grades become water-swellable superabsorbent polymers rather than soluble thickeners.
Q:
Can Sodium Polyacrylate be used as an industrial thickener?

A: Yes. Its polyelectrolyte character lets it increase viscosity and stabilize water-based systems such as paints, coatings, cleaners, and emulsions. The right molecular weight and neutralization level should be selected for the target rheology.
Q:
How is Sodium Polyacrylate used in water treatment and detergents?

A: In cooling water, boilers, and circulating systems, low-MW sodium polyacrylate disperses scale-forming salts and helps prevent deposition. In detergents, it supports soil dispersion and anti-redeposition performance.
Q:
Which applications require cross-linked Sodium Polyacrylate?

A: Cross-linked sodium polyacrylate is used where water absorption and retention are important, such as diapers, sanitary products, agricultural water-retention materials, and spill-control or gelling applications. It swells instead of dissolving in water.

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