| Product Name | CAS No. | Molecular weight | Molecular formula |
| Erbium nitride | 12020-21-2 | 181.2657 | Ern |
| Erbium(III) bromide nonahydrate | 29843-93-4 | 424.98628 | Br3Er.H2O |
| Erbium(III) chloride hydrate | 19423-85-9 | 291.63328 | H2O.Er+3.3[Cl-] |
| Erbium(III) fluoride | 13760-83-3 | 224.2542 | Er+3.3[F-] |
| Erbium(III) iodide | 13813-42-8 | ErI3 | |
| Erbium(III) nitrate pentahydrate | 10031-51-3 | 353.27 | Ern3O9 |
| Erbium(III) oxide | 12061-16-4 | 382.52 | Er2O3 |
| Erbium(III) sulfate octahydrate | 10031-52-4 | 766.82804 | 3[O4S-2].2[Er+3].8[H2O] |
| Erbium | 7440-52-0 | Er |