A stretched acrylic sheet which is to be formed into a vision panel at an elevated temperature has its major surfaces reheated to an elevated temperature for polishing prior to the formation of the final vision panel.


  1. Preheat billet of acrylic sheet to a stretching temperature.
  2. Apply stretching forces to the billet of material.
  3. Cool the stretched acrylic sheet to below softening temperature, before relaxing the stretching forces.
  4. Heat major surfaces of the stretched sheet to generate additional surface deformations.
  5. Cool the stretched sheet.
  6. Polish the major surfaces to remove deformations.
  7. Form a panel from the stretched acrylic sheet.

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 Citations, attribution, and content source(s) for this article

United States Patent US4361527A (accessed August 13, 2022).

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