Polyamine (CAS 42751-79-1) is a liquid cationic polymer that does its job only if the grade is right and the quality is consistent. Because it is a viscous liquid with no simple “purity” number, buyers often get confused about what to check. This purchasing guide covers the specification sheet, the COA, packaging and storage, and the supplier checklist — everything you need before you order.
1. Reading the Polyamine Specification Sheet
| Parameter | Typical value | Why it matters |
|---|---|---|
| Solid content | 40-60% (liquid) | Determines the effective polymer dose per liter |
| Viscosity | Varies by grade | Indirect indicator of molecular weight and consistency |
| Charge density | High (cationic) | The key performance parameter for charge neutralization |
| pH (as supplied) | Slightly acidic to neutral | Affects handling and compatibility |
| Appearance | Clear to pale yellow liquid | Quick visual QC check on arrival |
2. What a Complete COA Should Contain
- Product name and CAS number (42751-79-1)
- Batch number and production date
- Solid content (measured value)
- Viscosity (measured value at a stated temperature)
- Charge density or equivalent
- pH of the product
- Residual epichlorohydrin — critical for food/drinking-water/paper contact grades; verify it meets your limit
- Test methods and quality manager signature
3. Packaging, Storage and Shelf Life
- Packaging: typically 200 kg drums, 1000 kg IBC totes or bulk tanker; confirm what suits your dosing and storage setup.
- Storage: store sealed in a cool, dry place. Polyamine liquid can freeze at low temperature — check the product freeze point and protect outdoor tanks in winter.
- Shelf life: typically 12 months from production when stored properly; avoid prolonged exposure to air and sunlight.
- Handling: liquid polymer solutions are slippery when spilled; handle with care and keep spill kits available.
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 lead time plus shipping time to your port.
- Documents: commercial invoice, packing list, COA, MSDS and certificate of origin for international shipments; check the HS code classification with your forwarder.
- Liquid logistics: as a liquid product, shipping weight is significant — compare landed cost per kg of solid polymer, not per kg of solution.
5. How to Verify Quality on Arrival
- Check packaging integrity and labels against the COA batch number.
- Visually inspect: the liquid should be clear to pale yellow, free of visible sediment or phase separation.
- Measure viscosity and solid content with simple lab methods, comparing to the COA.
- Run a jar test against your existing batch using the same water and dose.
- Keep a retained sample for each batch for at least one production cycle.
6. Supplier Checklist
- Manufacturer vs trader — manufacturers control quality and price better for liquid polymers.
- Consistent quality — do they issue a full COA on every batch with residual monomer data?
- Application support — can they recommend the right grade and dose for your water?
- Stable supply and competitive landed cost per kg of solid polymer.
- Documentation and responsiveness for export logistics.
7. FAQ
What does solid content mean for a liquid polyamine?
It is the weight fraction of active polymer in the solution. Two products with the same viscosity but different solid content deliver different effective doses — always dose on a solid-polymer basis.
Is polyamine a dangerous good for shipping?
Most polyamine grades are not classified as dangerous goods, but confirm the SDS and UN classification with your forwarder, and check the applicable HS code.
Can I get a trial sample before a bulk order?
Yes. Most suppliers, including PolyblueChem, offer trial drums for jar testing and plant trials before you commit to bulk volumes.
How long can I store polyamine?
Typically 12 months sealed and stored cool. Freezing may damage the product — keep it above the freeze point in winter.
PolyblueChem supplies polyamine (CAS 42751-79-1) with full COA (including residual epichlorohydrin) and MSDS on every shipment. See also our polyamine guide and wastewater application guide. Contact us for a trial sample or quotation.