American made Lexan polycarbonate sheet is a very strong plastic which is guaranteed by manufacturer against breakage when used as a window for a three year period. It will scratch like Plexiglas, but will not break. Clear, masked both sides.
American made Plexiglas Grade C to Specification LP-391 is unshrunk. When heated to forming temperature of 220-250°F, it will shrink about 2.2% in length and width and will increase about 4% in thickness.
Specially ground point, 60° included tip angle, 0°rake angle, shoulder relieved, for drilling Plexiglas to prevent fractures, chipping or cracking. With instructions