Is there a technical reason why most touch screens use glass rather than plastic?
Title of question: Is there a technical reason why most touch screens use glass rather than plastic?

Note the word "technical" and not "marketing"


  What are the reasons that most modern portable touch devices come with
  a glass panel on their fronts, rather than plastic or something else?


Glass (as a cheap and common material) has a good dielectric constant (more than most cheap plastics) and this makes the change in capacitance bigger for those devices using that technology. This makes life easier on the electronics that has to detect finger positions and movement.



Taken from this article