Cast Acrylic is a form of poly(methyl methacrylate) (PMMA). It is formed by casting the monomer, methyl methacrylate, mixed with initiators and possibly other additives into a form or mold. Sheet and rod stock are generated by casting. It has better thermal stability, higher resistance to crazing when exposed to solvents, wider thermoforming range than extruded acrylic.
Cast acrylic has a better ability to be reworked hot and it is known for its superior surface finish and optical properties. Cast acrylic is more scratch resistant than extruded acrylic.
Cast acrylic is also preferred over extruded in applications that require machining, It is well suited for laser cutting.
Cutting with slow feed and minimal air cooling can produce a flame polished edge.