| 250810 | 250810 - Clays (excluding expanded clays of heading no. 6806); bentoni |
| 250820 | Decolourising earths and fuller's earth |
| 250830 | 250830 - Clays (excluding expanded clays of heading no. 6806); firecla |
| 250840 | 250840 - Clays (excluding expanded clays of heading no. 6806); n.e.c. |
| 250850 | 250850 - Clays (excluding expanded clays of heading no. 6806); andalus |
| 250860 | 250860 - Clays (excluding expanded clays of heading no. 6806); mullite |
| 250870 | 250870 - Clays (excluding expanded clays of heading no. 6806); chamott |