The most common name used to describe clear plastic would appear to be Perspex, and there are many others, but they are all actually trade names for Acrylic or PMMA (Polymethylmethacrylate).
Clear Acrylic (Poly(methyl methacrylate) is used extensively in the medical industry.
Acrylic vacuum chambers, cabinets, boxes, doors and windows can be found in hospitals and laboratories around the world. Premac lead loaded acrylic is used for radiation shielding of radio isotopes.
Bray Plastics have extensive experience in working with acrylic. Machining, fabricating and forming in acrylics under their various trade names of Perspex, Plexiglas, Acrylite, Altuglas etc.
Acrylic Machining for the Medical Industry