| Name | CAS No. |
| Aluminum-nickel catalyst | 12635-29-9 |
| Ammonium metatungstate hydrate | 12333-11-8 |
| Ammonium paratungstate | 11120-25-5 |
| Anhydrous Borax | 1330-43-4 |
| Ammonium Thioglycolate | 5421-46-5 |
| antimony trisulfide | 1345-04-6 |
| Aluminum potassium sulfate | 10043-67-1 |
| Acetone | 67-64-1 |
| Aluminum oxide | 1344-28-1 |
| Ammonium nitrate | 6484-52-2 |
| Ampicillin | 69-53-4 |
| Amoxicillin | 26787-78-0 |
| Ampicillin trihydrate | 7177-48-2 |
| Arsenic | 7440-38-2 |
| Aniline | 62-53-3 |