QUALITY
Each of these can be written into a technical agreement as a clause, and checked line by line in an audit.
The test report travels with the goods as standard, quoted in every offer — not something you have to chase.
D50 batch drift and Span are stated in the specification instead of a single typical value.
Free silica, total chlorides and conductivity, measured every batch and printed on the COA.
Batch numbers trace back to the mine lot and test records. Samples retained 12 months.
SGS / BV / Intertek re-inspection available for project orders, with cost and lead time agreed up front.
QC EQUIPMENT
| Instrument | What it measures |
|---|---|
| ICP-OES | Major and trace elements, rare-earth distribution and impurities |
| AAS | Confirmatory checks on specific metals |
| Potentiometric titration + fluoride ISE | Fluorine content — the key polishing-powder parameter |
| XRD (D8) | Phase identification, confirms the cerium-based main phase |
| BET (NOVA3000e) | Specific surface area |
| Laser diffraction (two Malvern units) | D10–D97 and Span |
| Sieve shaker | Coarse fraction by sieve, cross-checked against laser |
These instruments sit in the plant that produces EPOWDER® grades. Testing is specified and judged by our own technical team against one specification, and project orders can be routed to a third party for re-inspection.
COA CONTENT
TRACEABILITY
Samples of every batch are retained for 12 months and filed by lot number. If a customer reports an issue six months later, we re-test the retained sample and let the data decide whether the product drifted or the process changed. It takes storage space and filing discipline; most suppliers skip it. When a dispute happens, it is the only way to settle it with facts.
THIRD PARTY
Project orders can specify SGS, BV or Intertek re-inspection, with cost and lead time stated in the quotation. Being checkable is the point of the whole system.
OUR RULE
Every technical figure on this site must trace back to a TDS or COA. For grades we have not measured we publish the code and the mesh cut only, and mark the rest "available on request". It costs us some attractive marketing numbers, and buys this: when a customer benchmarks our TDS, it holds.
Material, machine, target result: three lines are enough. Grade recommendation within 48 hours; standard grades in stock, samples in 3–5 working days.
Get a grade recommendation peter@ef-global.cn