2.1.1 These Rules apply only to windows manufactured from cast stocks of
acrylic plastic satisfying the physical requirements set out in ASME PVHO-1.
Laminated material is not acceptable for use in the manufacture of acrylic windows.
All acrylic sheet casting shall have a nominal thickness of ½ inch or greater
2.1.2 A minimum of two test samples are to be cut and tested from each sheet of
casting. The acrylic castings from which the windows are produced must meet the
minimum physical properties as well after the castings have been annealed.