| Description | HS CODE |
| Other clays (not including expanded clays of heading No 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths... | 2508 |
| Refractory cements, mortars, concretes, etc.... | 3816 |
| Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods, other than those of siliceous fossil meals or similar siliceous earths... | 6902 |
| Refractory ceramic goods, retorts, tubes, etc... | 6903 |
