| Teflon® PTFE 305A fluoropolymer resin is a negatively charged, hydrophobic colloid containing approximately 60% (by total weight) of 0.05 to 0.5 mm polytetrafluoroethylene (PTFE) resin particles suspended in water. A milky white liquid, Teflon® PTFE 305A also contains approximately 8% (by weight of PTFE) of a nonionic wetting agent and stabilizer. Viscosity at room temperature is approximately 20 cP. Nominal pH is 10. Compared with other grades of PTFE dispersions, Teflon® PTFE 305A is used as a prime coat for high dielectric strength glass fabric. Teflon® PTFE 30B is then normally used for subsequent topcoats. When properly processed, the PTFE resin in Teflon® PTFE 305A exhibits the superior properties typical of the fluoropolymer resins: retention of properties after service at 260°C (500°F), useful properties at –240°C (–400°F), chemical inertness to nearly all industrial chemicals and solvents, and low friction and antistick surfaces. Dielectric properties are outstanding and stable with frequency and temperature. Chemours was formed from former DuPont performance chemicals businesses, including DuPont Fluoroproducts, in 2015. |
