Does Plasma tube have Hg? Penny Yu January 30, 2019 23:03 Follow It has no Hg. 0%. It is Mercury. Have more questions? Submit a request 1 Comments Date Votes 0 Henri Pavot January 30, 2019 23:03 Hg IS mercury. Is there mercury in the plasma tube and sphere ??? Yes or no ? Than you for your clairity. Henri Please sign in to leave a comment.