Pre-drying is not necessary if a vented cylinder is used but if a normal cylinder is used then PMMA must be processed dry and it is advisable to pre- dry the granules for up to 8 hours at 70-100°C. Surface defects and blisters will form if damp granules are processed.


Injection Molding

  • Melt temperature : 200- 250°C
  • Mold temperature : 40 – 80°C

High injection pressures are needed because of poor flow properties and it may be necessary to inject slowly to get the correct flow.



  • Extrusion temperature : 180 – 250°C

A degassing screw with an L/D ratio of 20 –30 is recommended.