Acrylic sheet has been on the market for more than 75 years, ever since Rohm & Haas introduced it as Plexiglas® in 1936. Yet, as commonplace as acrylic is, its chemistry has evolved. Sheet manufacturers typically modify the Poly Methyl Methacrylate (PMMA) with additives to change the performance properties of the plastic. Today, a wide range of acrylic products are available to sign makers, most of which are modifications of the original formula. Read more »