Sodium Polyacrylate
Industrial and hygiene-grade super absorbent powders and granules
- Chemistry
- Cross-linked sodium polyacrylate
- Grade
- Industrial / Hygiene
- Forms
- Fine powder, Granules
- Biodegradable
- No
Overview
Sodium polyacrylate is the workhorse super absorbent polymer for hygiene products and industrial liquid management. It offers the highest free-swell capacity of the common SAP chemistries.
Grade selection depends on the job: diapers and sanitary products need high retention under load; solidification needs fast gelling and stable gel; packaging absorbents need dust-free particles. It is not recommended for repeated soil application because it adds sodium.
Key points
- High free-swell and centrifuge retention capacity
- Grades for absorption under load and fast gelling
- Fine powder or granules for different dosing equipment
- Not intended for repeated agricultural soil use
Specifications
| Appearance | White powder or granules |
|---|---|
| Free swell, 0.9% saline | 50–60 g/g |
| Centrifuge retention (CRC) | 30–40 g/g |
| Absorption under load (0.7 psi) | 18–25 g/gHygiene grades |
| Particle size | 150–850 µm |
| Moisture | ≤ 5% |
| Residual monomer | ≤ 500 ppmLower limits available for hygiene grades |
Indicative values for this polymer class. The Technical Data Sheet for your grade and the Certificate of Analysis for your batch take precedence.
Compare with other productsApplications
- Hygiene products
- Absorbent cores for baby diapers, adult incontinence products and sanitary pads.
- Liquid solidification
- Solidifying aqueous industrial and medical liquid waste for safer handling.
- Absorbent pads
- Food-tray and packaging absorbent pads where the polymer is enclosed.
- Cable & construction
- Water-blocking tapes and compounds (grade-dependent).
How to use it
- 1Choose the grade by the property that matters in your product: CRC, AUL, gelling speed or particle size.
- 2Dose with dust control; fine powder can irritate airways.
- 3Request an SDS before first handling and a CoA with every batch.
Good to know
- Adds sodium to soil — use potassium polyacrylate for agriculture.
- Absorption falls sharply in brines and multivalent-ion solutions.
Documents
Shared for the grade you are evaluating. A Certificate of Analysis accompanies every batch.
Evaluating sodium polyacrylate?
Send your application and target values. We'll recommend a grade and arrange a sample with its documents.