Steady-state ionisation currents under uniform field conditions have been measured in SF6 over the range 110 ÃÂ¿E/pÃÂ¿1000V cmÃÂ¿1torrÃÂ¿1 with gas pressures varying from 1 to 10 torr, at 20ÃÂ°C. Sparking potentials Vs were also measured for a range 1ÃÂ¿pdÃÂ¿20 torr-cm. Townsend's primary ionisation (ÃÂ¿/p) and electron-attachment (ÃÂ¿/p) coefficients were found to depend on E/p only. The values of secondary-ionisation coefficient (ÃÂ¿) were also determined over the range 140ÃÂ¿E/pÃÂ¿600 V cmÃÂ¿1 torrÃÂ¿1. Measurements of Vs of SF6 have shown that the deviations from Paschen's law rise up to ÃÂ±3.5% at values of pd near the Paschen minimum.