1. DuPont PFA — Properties Bulletin: http://www2.dupont.com/Teflon_Industrial/en_US/assets/downloads/h04321.pdf.
2. U.S. Pat. Nos. 3,953,566; 3,962,153; 4,096,227; 4,110,392 and 4,187,390.
3. U.S. Pat. Nos. 4,623,670 and 4,702,836.
4. U.S. Pat. No. 4,906,377.
5. Formation of microporous Teflon® PFA membranes via thermally induced phase separation