A nozzle assembly for an inkjet printhead is provided. The nozzle assembly comprises a nozzle chamber having a roof, the roof having a moving portion moveable relative to a static portion and a nozzle opening defined in the roof, such that movement of the moving portion relative to the static portion causes ejection of ink through the nozzle opening. The nozzle assembly also comprises an actuator for moving the moving portion relative to the static portion, and a mechanical seal interconnecting the moving portion and the static portion. The mechanical seal comprises a polymeric material selected from the group comprising: polymerized siloxanes and fluorinated polyolefins.