PMMA (Polymethyl methacrylate)
Typical Applications
Automotive (signal light devices, instrument panels, etc.), medical (blood cuvettes, etc.), industrial (video discs, lighting diffusers, display shelving, etc.), consumer (drinking tumblers, stationery accessories, etc.)
Injection Molding Processing Conditions
Drying |
PMMA is hygroscopic and must be dried prior to molding. Drying at 90 C (194 F) for 2-4 hours is recommended. |
Melt Temperature |
240 - 280 C (460 - 536 F) |
Mold Temperature |
35 - 80 C (90 - 176 F) |
Injection Speed |
Moderate |
Chemical and Physical Properties
Pellets for injection molding are made either by bulk polymerization of methyl methacrylate followed by extrusion and pelletization or by polymerization in an extruder. Formulations vary by molecular weight and physical properties such as flow rate, heat resistance, and toughness. Higher molecular weight grades are tougher than lower molecular weight grades. High flow formulations are generally preferred for molding.
Heat deflection temperature under load varies from 75 C (167 F) for high flow materials to 100 C (212 F) for low flow (high molecular weight) materials.
PMMA has excellent optical properties and weatherability. The white light transmittance is as high as 92%. Molded parts can have very low birefringence which makes it ideally suited as a material for video discs.
PMMA exhibits room temperature creep. The initial tensile strength is high but under long term, high stress loading, it exhibits stress craze. Impact strength is good but it does show some notch sensitivity.
If you need to look for more plastic resin injection molding processing condition, could you please click it.The following is other plastic processing condition:
ABS injection molding processing condition,
HDPE injection molding processing condition,
LDPE injection molding processing condition,
PA12 injection molding processing condition,
PA6 injection molding processing condition,
PBT injection molding processing condition,
PC-ABS injection molding processing condition,
PC-PBT injection molding processing condition,
PEI injection molding processing condition,
PETG injection molding processing condition,
PMMA injection molding processing condition,
POM injection molding processing condition,
PPE injection molding processing condition,
HDPE injection molding processing condition,
PP injection molding processing condition,
PS injection molding processing condition,
PVC injection molding processing condition,
SAN injection molding processing condition,