PolyDADMAC (polydiallyldimethylammonium chloride, CAS 26062-79-3) is a liquid cationic polymer sold in a range of solids contents, viscosities and purity grades. Because it has no single “purity” number, buyers often struggle to compare quotes. This purchasing guide covers the specification sheet, the COA, packaging and storage, and the supplier checklist for PolyDADMAC.
1. Reading the PolyDADMAC Specification Sheet
| Parameter | Typical value | Why it matters |
|---|---|---|
| Solid content | 20-40% | Sets the effective dose per liter |
| Viscosity | Grade-dependent | Indicates molecular weight and consistency |
| Charge density | Very high | Core performance parameter |
| pH | Typically 3-7 | Handling and compatibility |
| Residual monomer | Low (DADMAC, allyl chloride) | Safety and drinking-water approval |
Two numbers define the grade for most buyers: solid content (what you are actually paying for per liter) and viscosity (a proxy for molecular weight, which drives performance). Compare quotes on a “per kg of dry polymer” basis, not per liter of solution.
2. What a Complete COA Should Contain
- Product name and CAS number (26062-79-3)
- Batch number and production date
- Solid content (measured)
- Viscosity (measured, at stated temperature)
- Charge density or equivalent
- pH of the product
- Residual monomer/impurities (DADMAC, allyl chloride, and for drinking-water grades the NSF 60-relevant values)
- Test methods and quality manager signature
3. Packaging, Storage and Shelf Life
- Packaging: typically 200 kg drums, 1000 kg IBC totes, or bulk tanker; choose based on your dosing and storage setup.
- Storage: sealed, cool, dry; protect from freezing (check the freeze point and protect outdoor tanks in winter).
- Shelf life: typically 12 months from production when stored properly.
- Handling: viscous liquid — spills are very slippery; keep drip trays and spill kits.
4. MOQ, Lead Time and Logistics
- MOQ: from trial drums to full container loads; confirm the quantity that fits your trial and production plan.
- Lead time: production plus shipping time to your port.
- Documents: commercial invoice, packing list, COA, MSDS, certificate of origin for exports; confirm HS code classification with your forwarder.
- Liquid logistics: shipping weight is significant — compare landed cost per kg of dry polymer.
5. How to Verify Quality on Arrival
- Check packaging integrity and labels against the COA batch number.
- Visual check: clear, free of sediment or phase separation.
- Measure viscosity and solids with simple lab methods; compare with the COA.
- Run a jar test against your existing batch on the same water.
- Keep a retained sample per batch.
6. Drinking-Water Grades: Extra Checks
If the PolyDADMAC will be used in potable water treatment, add these to the checklist:
- Certification: NSF/ANSI 60 (North America) or the applicable local potable-water approval — verify the certificate covers the specific product and batch range.
- Certified maximum dose: the approval specifies a maximum safe dose; confirm your plant’s dose is within it.
- Residual monomer data: on every COA, not just a one-time certificate.
7. Supplier Checklist
- Manufacturer vs trader — manufacturers control quality and cost for liquid polymers.
- Consistent COA with residual monomer data on every batch.
- Application support — can they recommend the right grade and dose for your water?
- Stable supply, reasonable lead time, and landed cost per kg of dry polymer.
- Drinking-water certification, if applicable.
8. FAQ
Why compare quotes on dry-polymer basis?
Because solid content varies between 20% and 40%, the price per liter is meaningless. Convert to price per kg of dry polymer to compare suppliers fairly.
Is viscosity a reliable quality indicator?
Yes, as a batch-consistency check: viscosity correlates with molecular weight. Large deviations from the COA indicate quality drift.
Can I get a trial sample?
Yes. Most suppliers, including PolyblueChem, offer trial drums for jar testing before bulk orders.
How long can I store PolyDADMAC?
Typically 12 months sealed and cool; avoid freezing, which can damage the product.
9. References and Further Reading
- NSF/ANSI 60 (drinking-water chemicals) requirements
- Standard polymer test methods (viscosity, solids)
- Manufacturer COA and SDS guidance
This article is published for industrial and technical reference by PolyblueChem. Specifications are typical industry values; always verify against the supplier’s COA.
PolyblueChem supplies PolyDADMAC (CAS 26062-79-3) in drinking-water and industrial grades, with full COA and MSDS. See our PolyDADMAC guide and drinking water guide. Contact us for samples and quotations.