What is the yield strength of glass, Lexan, or Plexiglas?

I am doing project design for my fluid mechanics class and I need to design underwater window for an aquarium. I tried searching but couldn’t find the yield strength of either glass, Lexan, or plexiglas.

Does anyone know the yield strength of glass, Lexan, or plexiglas? If so, what is it and I would also need the link to the info. for reference.
OK…being that I need to show my calculations, i’ll need actual values of strength for the materials not just one is going to be stronger than the other.