A plasma cleaner is a controlled chamber that enables the formation of a vacuum while adding gasses in a controlled way. It is used to process the surface of different materials, removing impurities at the molecular level through the use of energetic plasma created from gasses like oxygen. We use it in our lab to activate the surface of bioreactors made out of PDMS and glass slides. By plasma cleaning the surfaces of the two materials, they can be permanently bonded together with a water tight seal without the need for any other materials, like glue or tape.