A COA should match the delivered batch rather than serving only as a historical example.
- Confirm whether the NaCl value is reported on a dry or wet basis.
- Check units and limits for calcium, magnesium, sulfate and water-insoluble matter.
- Match the test date and batch number to the delivered batch.
- Record contractual values separately from representative batch data.
For specific processes, review sample tests, equipment conditions and acceptance methods together.