Overview
This case presents laboratory fired-cake records for three kaolin samples tested by FOSHAN POWTECH / PTMS: one at 325 mesh, one at 200 mesh and one at 250 mesh. Each sample was recorded as received (raw), after a first pass through a magnet, and after a second pass. Dry whiteness, wet whiteness and shrinkage were measured on cakes fired at 1200°C. Values are shown exactly as recorded.
These are laboratory fired-cake records, not third-party chemical assays. Each sample's results should be read only against its own raw, first-pass and second-pass values. The original records do not specify the equipment or process conditions.
Test results
The tables below list dry whiteness, wet whiteness and shrinkage, exactly as recorded. Empty fields in the original records are omitted and have not been estimated.
Kaolin, 325 mesh
Laboratory record, 2026. Two passes. Fired cakes at 1200°C.
Left to right: raw sample; after the first pass; after the second pass. Laboratory fired cakes at 1200°C.
| Item | Raw sample | After first pass | After second pass |
|---|---|---|---|
| Dry whiteness | 71 | 82 | 83 |
| Wet whiteness | 49 | 66 | 67 |
| Shrinkage | -7 | -7 | -8 |
Kaolin, 200 mesh
Laboratory record, 2026. Two passes. Fired cakes at 1200°C.
Left to right: raw sample; after the first pass; after the second pass. Laboratory fired cakes at 1200°C.
| Item | Raw sample | After first pass | After second pass |
|---|---|---|---|
| Dry whiteness | 46 | 75 | 84 |
| Wet whiteness | 27 | 56 | 70 |
| Shrinkage | -16 | -22 | -18 |
Kaolin, 250 mesh
Laboratory record, 2025. Two passes. Fired cakes at 1200°C.
Left to right: raw sample; after the first pass; after the second pass. Laboratory fired cakes at 1200°C.
| Item | Raw sample | After first pass | After second pass |
|---|---|---|---|
| Dry whiteness | 26 | 62 | 64 |
| Wet whiteness | 20 | 54 | 56 |
| Shrinkage | -11 | -11 | -11 |
Notes on the results
These figures are laboratory fired-cake records (1200°C), not third-party chemical assays. They are for reference only and are subject to a laboratory test on the customer's own sample.
Laboratory test results are not a guarantee of industrial-plant performance. Customers are welcome to send 5–10 kg for a free laboratory test; a report is issued within 5 days of sample receipt.
Test your own kaolin
Every ore behaves differently. Send FOSHAN POWTECH / PTMS a 5–10 kg sample of your kaolin for a free laboratory test, and we will share the before-and-after results with you.
FARRALI