Poly(methyl methacrylate)
![](/Images/godic/202502/03/PMMA_repeating_unit.svg3817.png")
![Lichtenberg figure: high voltage dielectric breakdown in an acrylic polymer block](/Images/godic/202502/03/Lichtenberg_figure_in_block_of_Plexiglas3818.jpg")
![Illustrative and secure bromine chemical sample used for teaching. The sample vial of corrosive and poisonous liquid has been cast into an acrylic plastic cube](/Images/godic/202502/03/Bromine_vial_in_acrylic_cube3818.jpg")
![Close-up of pressure sphere of Bathyscaphe Trieste, with single conical window of PMMA (Plexiglas) set into sphere hull. The very small black circle (smaller than the man's head) is the inner side of the plastic](/Images/godic/202502/03/Bathyscaphe_Trieste_sphere3818.jpg")
Poly(methyl methacrylate) (PMMA), also known as acrylic or acrylic glass as well as by the trade names Plexiglas, Acrylite, Lucite, and Perspex among several others (see below), is a transparent thermoplastic often used in sheet form as a lightweight or shatter-resistant alternative to glass. The same material can be utilised as a casting resin, in inks and coatings, and has many other uses.