Magnetic seal

"Will you forget it? I already tried it. It's magnetically sealed!"

- Luke Skywalker, to Han Solo

The magnetic seal was a technology that could repel blaster bolts and could be applied to an entire room. The doors of the garbage mashers located aboard the Death Star were magnetically sealed. When the Corellian smuggler Han Solo tried to fire at the hatch of one of those mashers, his laserbolt ricochetted wildly around the metal room, nearly hitting him and his companions.

Appearances

 * Star Wars Episode IV: A New Hope