Quick answer
Use viscosity to define a screening range, not to declare a winner. Yuruihong PD J41, J45, J47 and J49 share approximately 39-41% solids and pH 5-7, while their 25°C viscosity ranges increase from 1,000-3,000 cps to 8,000-13,000 cps. Final selection requires equal-active-dose testing with representative process water.
A higher-viscosity PolyDADMAC grade is not automatically better. Viscosity is an important specification, but the right grade is the one that produces the required charge neutralization, clarification and operating stability in the buyer's actual process.
Yuruihong PolyDADMAC grade range
Typical viscosity ranges at 25°C are PD J41 at 1,000-3,000 cps, PD J45 at 3,000-5,000 cps, PD J47 at 5,000-8,000 cps and PD J49 at 8,000-13,000 cps. Published values support preliminary screening; final specifications remain subject to the approved TDS and batch COA.
Practical starting points by application
PD J41 and PD J45 are often useful starting points for papermaking charge control, process-water clarification and systems that value easier pumping. PD J47 and PD J49 may be included when screening stronger decolorization or higher charge-demand wastewater. These are trial directions, not fixed application limits.
What to compare during a jar test
Compare equal active-solids dosage where possible. Record dispersion, floc appearance, settling speed, supernatant clarity, color removal, sludge volume and signs of overdosing. Confirm dilution, transfer-pump and dosing-equipment limits before commercial selection.
Frequently asked questions
Is PD J49 always more effective than PD J41?
No. J49 has a higher viscosity range, but the preferred grade depends on the actual water, process and treatment target.
What solids content does the PD series use?
The standard PD J41, J45, J47 and J49 range is supplied at approximately 39-41% solids.
What should a buyer send for grade selection?
Send the application, representative water data, current chemical program, target result, dosing equipment and a sample when available.