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Does Mylar film has birefringence properties? I am unsure about this and would like to know the reason behind its properties.

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    $\begingroup$ Likely, yes, given how it is made. $\endgroup$ – Jon Custer Jun 2 '17 at 14:49
  • $\begingroup$ Can you explain the relationship between how it is made and the birefringence properties? Is it because the film is drawn biaxially? $\endgroup$ – Tammy Chong Jun 2 '17 at 14:57
  • $\begingroup$ Like many materials systems, the processing to get large sheets tends to align (crystal grains, polymer chains) along the rolling direction. This induces a (perhaps slight) asymmetry in mechanical, optical, ... properties. $\endgroup$ – Jon Custer Jun 2 '17 at 15:02
  • $\begingroup$ Easy enough to test with two crossed polarizers. $\endgroup$ – Pieter Jun 2 '17 at 15:10
  • $\begingroup$ One of the first results from a Google search on 'mylar birefringence' states "Mylar is strongly birefringent, a serious inconvenience for measurements of polarized light." $\endgroup$ – Jon Custer Jun 2 '17 at 15:29

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