| Naics index | Naics index description |
|---|---|
| 327120 | Floaters, glasshouse, clay, manufacturing |
| 327120 | Floor tile, ceramic, manufacturing |
| 327120 | Flue lining, clay, manufacturing |
| 327120 | Glasshouse refractories manufacturing |
| 327120 | Insulating firebrick and shapes, clay, manufacturing |
| 327120 | Kiln furniture, clay, manufacturing |
| 327120 | Liner brick and plates, vitrified clay, manufacturing |
| 327120 | Magnesia refractory cement manufacturing |
| 327120 | Mortar, nonclay refractory, manufacturing |
| 327120 | Mortars, clay refractory, manufacturing |