PLEXIGLAS® solid sheets are available as cast acrylic – PLEXIGLAS® GS – and extruded acrylic, PLEXIGLAS® XT.
PLEXIGLAS® GS sheets are manufactured by casting liquid methyl methacrylate (MMA) between two plates of glass. The MMA polymerizes, i.e. cures, inside the cell. The techniques Röhm employs are polymerization in a water bath, in a hot-air oven and by the Rostero process.

PLEXIGLAS® XT sheets are manufactured from prepolymerized polymethyl methacrylate (PMMA) pellets. These are homogenized in an extruder and then extruded by appropriate tools into solid sheets, multi-skin and corrugated sheets, but also into tubes and rods.

Although PLEXIGLAS® GS and PLEXIGLAS® XT sheets are two different products obtained by different manufacturing methods, which therefore also differ in some of their fields of application, yet there are similarities between them as far as their properties are concerned.