DuPont™Nafion®PFSA polymer dispersions are made from chemically stabilized perfluorosulfonic acid/PTFE copolymer in the acid (H+) form, and are available in several polymer content and dispersant compositions. Typical uses include fabrication of thin films and coating formulations for fuel cell membranes, catalyst coatings, sensors, and a variety of electrochemical applications.
Typical Composition
| D520CS | D521CS | D2020CS | D2021CS | |
| Polymer Content, wt% | 5.0 min. | 5.0 min. | 20.0 min. | 20.0 min. |
| 5.4 max. | 5.4 max. | 22.0 max. | 22.0 max. | |
| Water Content, wt% | 45 ± 3 | 45 ± 3 | 34 ± 2 | 34 ± 2 |
| VOC Content, wt% | 50 ± 3 | 50 ± 3 | 46 ± 2 | 46 ± 2 |
| 1-Propanol | 48 ± 3 | 48 ± 3 | 44 ± 2 | 44 ± 2 |
| Ethanol | <4 | <4 | <2 | <2 |
| Mixed Ethers and Other VOCs | <1 | <1 | <1 | <1 |
| Specific Gravity | 0.92−0.94 | 0.92−0.94 | 1.01−1.03 | 1.01−1.03 |
| Available Acid Capacity, meq/g, H+ polymer basis | >1.00 | >0.92 | >1.00 | >0.92 |
| Total Acid Capacity, meq/g, H+ polymer basis | 1.03−1.12 | 0.95−1.03 | 1.03−1.12 | 0.95−1.03 |
| Viscosity, cP, at 25 °C (77 °F) and 40 sec–1 Shear Rate* | 10−40 | 10−40 | 50−500 | 50−500 |
