Poly(methyl methacrylate) (PMMA), also known as acrylic or acrylic glass as well as by the trade name, Limacryl, R-Cast, Perspex, Plazcryl, Acrylex, Acrylite, Acrylplast, Altuglas, Polycast and Lucite and is commonly called acrylic glass or simply acrylic. PMMA is often used as an alternative to glass.