- Plastic refractories (2)
- Tank blocks, glasshouse: clay (1)
- Tile and brick refractories, except plastic (1)
- Brick, clay refractory (1)
- Fire clay blocks, bricks, tile, or special shapes (2)
- Firebrick, clay (1)
- Tile, clay refractory (1)
- Firing oven and accessories, clay (1)
- Castable refractories: clay (2)
