The computer chip is covered by/with a plastic 'membrane'. [=the computer chip is covered by/with a very thin sheet of plastic]
a cell 'membrane'
(..) Humidity has risen % and the temperature is up degrees. Mr Data and I will be right there. Number One, take charge down here. The damage to her cell membranes is repaired. She should be fine. Find out why it's so hot in here. - Now what? - Crusher to Engineering. Crusher to Bridge. (..)1996 Star Trek: First Contact