Do not open the lid while the rotor is moving

Even though many centrifuges have a safety shutoff if the lid is opened, the only thing this does is stop powering the rotor. The rotor will still spin due to its own inertia for a while until friction slows and eventually stops it. For centrifuges with swinging bucket rotors, fasten a protective inner safety lid (if available for your model centrifuge) onto the bucket; for those with fixed angle rotors, fasten an inner safety lid to the rotor before centrifugation. Ensure that the safety lid is properly sealed and positively locked into place.