Thank you to all who gave me advices on dealing with plastic in paraffin block! The film is called Tegaderm, the product from 3M. I leave the sample in formalin for a longer time. at the same time, as you suggested, I cut a small piece into Xylene. But it is still there the next morning :(. So xylene can not disolve this material. I didn't test it in xylol. When I came back to my samples, I found the film is much easier to be peeled off now after a longer time fixation. 
 
Thank you again!
 
Wen

		
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