The word Acrylic is a short for 'Methyl Methacrylate'.Acrylic sheet is a crystal clear (with transparency equal to optical glass), lightweight material having outstanding weatherability, high impact resistance, good chemical resistance, and excellent thermo-formability and machine ability. They come in a wide variety of transparent, translucent, frosty and opaque colors; as well as in several different surface patterns. There are 2 forms of Acrylic - Cast & Extruded.