Polyaluminum Chloride (PAC, Paper Grade)
CAS Number: 1327-41-9
Polyaluminum chloride (PAC) is a highly effective inorganic coagulant used in papermaking wet end and wastewater treatment. Its pre-hydrolyzed polymeric aluminum species provide superior charge neutralization and coagulation of colloidal substances compared to conventional alum, and are effective over a wider pH range (5–9). PAC improves retention, drainage, and formation while also functioning as a fixative for anionic substances in the furnish.
Technical Specifications
| appearance | Pale yellow to amber liquid |
| basicity (%) | 60–85 |
| Fe content (%) | ≤ 0.01 |
| pH (1% solution) | 3.5–5.0 |
| Al₂O₃ content (%) | 10±1 |
Applications
- Wet-end coagulant in neutral and alkaline papermaking
- Anionic trash fixation in recycled fiber systems
- Wastewater coagulation and sludge dewatering
- ASA and AKD sizing efficiency improvement
- Drainage improvement in high-speed paper machines
Key Features
- Effective over wider pH range than alum (pH 5–9)
- Superior charge neutralization for dissolved and colloidal substances
- Low sulfate addition — compatible with alkaline papermaking
- Versatile: suitable for both wet-end and wastewater treatment
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