Pmma- Polymethylmethacrylate

Pre-drying is not necessary if a vented cylinder is used but if a normal cylinder is used then Pmma- Polymethylmethacrylate 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 a 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 a 250C
A degassing screw with an L/D ratio of 20 a 30 is recommended.

Strengths:
* Outstanding transparency
* Excellent UV resistance
* High color brightness and stability
* Surface Hardness
* Half the weight of glass
* Good dimensional stability
* Good insulating properties