PMMA is an abbreviation of the word Polymethylmethacrylate. This in turn came together from the words polymer and methyl methacrylate. It is a transparent plastic. The material is also called acrylate, oroglass, altoglass, perspex or plexiglass. Plexiglas will be more familiar to most. The material is used in many different ways as it brings severa... Found on https://www.tralert.com/en/lighting-terms/pmma/