| Name | CAS No. |
| Acephate | 30560-19-1 |
| Acetic acid | 64-19-7 |
| Acetic anhydride | 108-24-7 |
| Acetone | 67-64-1 |
| Acetonitrile | 75-05-8 |
| Acetophenone | 98-86-2 |
| acetylene | 74-86-2 |
| Acrylic acid | 79-10-7 |
| Acrylonitrile | 107-13-1 |
| Adipic acid | 124-04-9 |
| alpha-pinene | 2437-95-8 |
| Aluminum chloride | 7446-70-0 |
| Aluminum fluoride | 7784-18-1 |
| Aluminum hydroxide | 21645-51-2 |
| Aluminum oxide | 1344-28-1 |