PMMA: The full form of PMMA is Poly methyl methacrylate. It is a most importantcommercial high polymer. It comes from the acrylic class. It is also known astransparent plastic or acrylic glass. Its IUPAC name is Poly(methyl 2-methylpropenoate).
attached photo is a PMMA acrylic photo block frame, acrylic picture frame