PMMA is a kind of polymer which is polymerized by acrylic acid and its esters. The corresponding plastics are called polyacrylic plastics. Among them, polymethylmethacrylate methyl ester is the most widely used. PMMA, commonly known as plexiglass, is the best synthetic transparent material so far.
PMMA has the advantages of light weight, low price and easy forming. Its forming methods include casting, injection molding, machining, thermoforming, etc. In particular, injection molding can be mass production, simple process, low cost. Therefore, it is widely used in instrument parts, automobile lamps, optical lenses, transparent pipes, etc.