The effect of nanotubes on FKM formulations
Precix has introduced new formulations for fuel system seals in conjunction with technology partner Hyperion Catalysis Inc. High-fluorine FKM formulations containing carbon nanotubes provide electrostatic dissipation without the shortcomings of conductive carbon black.
Most notable is the much lower loading of carbon nanotubes required for comparable volume resistivity. The lower proportion translates into a softer material, providing easier assembly and better sealing. Table 1 compares the hardness for typical nanotube-based, high-fluorine FKM formulations with conductive carbon black fillers. Stress/strain profiles follow the durometer hardness trend.