CPAM High Charge Density
High charge density cationic polyacrylamide is our best-selling product for sludge dewatering. With 25-70% cationicity and 12-20 million MW, it neutralizes negatively charged sludge particles effectively, producing dry, compact filter cakes on belt presses and centrifuges.
Specifications
| Type | Cationic |
| Molecular Weight | 12–20 million Da |
| Charge Density | 25-70% |
| Solid Content | ≥90% |
| Dissolving Time | ≤90 min |
| Residual Monomer | ≤0.05% |
| Appearance | White granular powder |
| Packaging | 25 kg PP woven bags + Kraft paper |
Key Features
- Superior sludge dewatering — cake moisture <80%
- Low dosage: 2–5 kg per ton dry solids
- Rapid dissolution in 60 minutes
- Stable in pH 6–9
Applications
- Municipal sludge dewatering (belt press, centrifuge)
- Industrial sludge treatment
- Sewage treatment plants
- Food processing waste
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Brand Equivalents & Replacements
Our CPAM High Charge Density is a tested replacement for these international brands. Free samples available for side-by-side comparison.
| Brand | Grade | Notes |
|---|---|---|
| SNF | FLOPAM FO 4490 | Equivalent 40–50% cationicity for bio-sludge |
| NALCO | NALCO 71303 | Belt press application, similar dosage |
| Kemira | Superfloc C-492 | Comparable charge density for municipal WWTP |
| Solenis (ex-BASF) | Zetag 8160 | Published as medium-high charge / high MW cationic powder |
| Solenis (ex-BASF) | Zetag 8180 | Published as high charge / high MW cationic powder |
Need a replacement for a different grade? Contact us with your current product specs.
Dosage Guide
2–5 kg per ton dry sludge solids for belt press; 3–8 kg/t DS for centrifuge.
Frequently Asked Questions — CPAM High Charge Density
How to choose charge density for my sludge?
Run a CST (Capillary Suction Time) test. Generally: organic sludge (WAS) needs 40–60% charge; mixed sludge 25–40%; primary sludge 15–25%. Higher volatile solids = higher charge needed.
Belt press vs centrifuge — different product?
Same product, different MW preference. Belt press works well with 12–15M MW; centrifuge benefits from higher MW (15–20M) for stronger flocs that resist shear.
Can it replace Magnafloc LT-7989?
No, and it is worth being precise about why. The Magnafloc LT 79xx grades are polyamine and polyDADMAC based liquid coagulants, not polyacrylamides, so matching them to a CPAM grade is a chemistry error rather than a close approximation. We do not currently supply the polyamine line. If you are running LT-7989 today, tell us the duty and we will say honestly whether we have anything that fits. Our Zetag and Magnafloc cross-reference guide on the blog sets out what is and is not published for that range. For Zetag, which is a cationic polyacrylamide, this grade is a genuine candidate.
What is the shelf life?
2 years in sealed original packaging stored in cool, dry conditions. Once dissolved, use within 24 hours for full effectiveness.
Related Products
Zetag 8185 / 8187 Equivalent — High-Charge CPAM (CNfloc C8006)
CNfloc C8006 is our high charge density cationic polyacrylamide positioned against the Zetag 8185 and 8187 grades for municipal and industrial sludge dewatering on belt press and centrifuge.
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