Define the purchase duty
Recycled aggregate feed can vary enough that one convenient sample is not an adequate supply specification. A buyer should identify the material states the product must cover and preserve the water chemistry and upstream treatment associated with each trial.
Identify the sample, actual feed and required water-and-solids result before asking for a recurring supply commitment.
Define representative input states
Record material source and known concrete, masonry or other feed fractions, fines, solids, pH and conductivity. Identify any site restrictions on sampling or handling the material. The wash-water record provides the operating context.
Do not infer a universal high-pH or charge condition from the recycled label. Use measurements and keep materially different inputs separate in the sample plan.
Compare the complete sequence
Prepare identified samples using the intended make-down water. Hold coagulant and pH-control sequence fixed for a direct grade comparison, or document a wider program change explicitly. Measure clarity, settling and bed behavior over active dose.
The charge screen is a way to test whether an anionic bracket fits; it is not evidence that every recycled feed needs the same ionic family.
Set operating and supply boundaries
Confirm recycle-water requirements, solids withdrawal and any press acceptance on the actual equipment. State what feed changes trigger a dose review or another sample screen before routine use continues.
A multi-grade proposal needs traceable inventory and practical operator controls. Do not approve frequent unidentified switching merely because different laboratory samples produced different apparent winners.
Test the limiting condition
A product selected on one stable concrete-rich feed may not have demonstrated performance on the next mixed input. Keep the tested material range visible rather than turning a narrow successful trial into an unrestricted recycled-material claim.
Preserve any untested condition in the acceptance record. A promising sample response is not an unrestricted capacity or treatment guarantee.
Keep a traceable comparison
| Purchase check | Evidence | Decision boundary |
|---|---|---|
| Input | Identified feed states and chemistry | Variability not hidden |
| Sequence | Fixed or explicitly changed treatment | Fair comparison |
| Scope | Equipment outputs and review trigger | Supply matches tested range |
Retain the commercial code, sample reference, preparation method and measurement timing. Record rejected conditions as well as the preferred point so later shipments can be assessed against the actual evidence.
Request a scoped recommendation
Send material-state records, solids and water measurements, treatment sequence, separator and solids route. Request a candidate strategy with clear tested limits and the evidence needed before adding another routine grade.
Use the anionic emulsion sample and quotation form and review supply and packaging controls with Gongyi Xinqi Polymer Co., Ltd.. Confirm offered grade, availability and commercial terms before ordering.