Adhesive for polymethyl methacrylate. Dissolve pieces of polymethacrylate plate in trichlorethylene or carbon tetrachloride for thin glue. Glued areas become opaque. The use of chloroform as a solvent makes the joint less brittle and transparent. Polymethacrylate plates can be glued into thicker layers, keeping their transparency, lubricating surfaces with acetic anhydride and squeezing tightly. After the day has elapsed, it becomes homogeneous, transparent block. A prerequisite for maintaining transparency is the absolute absence of water in the acetic anhydride. Concentrated acetic acid (the so-called. glacial) gives the joints slightly cloudy.