Reference the table below to cross-reference PFAS compounds. For more information about our PFAS standards, visit our Reference Standard FAQ.
| Abbreviation | Acid Name | Acid CAS Number | Salt Name | Salt CAS Number |
| Perfluoroalkyl sulfonic acids/anions | ||||
| PFBS | Perfluorobutanesulfonic acid | 375-73-5 | Potassium Perfluorobutanesulfonate | 29420-49-3 |
| PFPeS | Perfluoropentanesulfonic acid | 2706-91-4 | Sodium Perfluoropentanesulfonate | 630402-22-1 |
| br-PFHxS | Perfluorohexanesulfonic acid | 355-46-4 | Potassium Perfluorohexanesulfonate | 3871-99-6 |
| PFHxS | Perfluorohexanesulfonic acid | 355-46-4 | Sodium Perfluorohexanesulfonate | 82382-12-5 |
| PFOS | Perfluorooctanesulfonic acid | 1763-23-1 | Potassium Perfluorooctanesulfonate | 2795-39-3 |
| Fluorotelomer sulfonic acids | ||||
| 4:2 FTS | 1H,1H, 2H, 2H-Perfluorohexane sulfonic acid | 757124-72-4 | Sodium 1H,1H,2H,2H-Perfluorohexane sulfonate | 27619-93-8 |
| 6:2 FTS | 1H,1H, 2H, 2H-Perfluorooctane sulfonic acid | 27619-97-2 | Sodium 1H,1H,2H,2H-Perfluorooctane sulfonate | 27619-94-9 |
| 8:2 FTS | 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid | 39108-34-4 | Sodium 1H,1H,2H,2H-Perfluorodecane sulfonate | 27619-96-1 |
| Ether sulfonic acids | ||||
| PFEESA | Perfluoro(2-ethoxyethane)sulfonic acid | 113507-82-7 | Sodium Perfluoro(2-ethoxyethane)sulfonate | 113507-87-2 |
