PMMA CHIMEI CM‑205
PMMA CHIMEI CM‑205
PMMA CHIMEI CM‑205 is heat‑resistant injection‑molding polymethyl methacrylate. It features outstanding heat resistance, high transparency and good mechanical strength for multi‑field applications.
Main Applications
Automotive & motorcycle: indicator lamp housings (typical application).
Optical components: sunglass lenses.
Electrical & electronics: watch / clock face housings, home‑appliance assemblies.
Extrusion profiles: sheets, rods and tubes.
Lighting: lamp covers, diffusion panels.
Properties
表格
| Property Category | Item | Test Standard | Value | Unit |
|---|---|---|---|---|
| Physical | Density | ASTM D792 | 1.19 | g/cm³ |
| Water absorption (24 h) | ASTM D570 | 0.3 | % | |
| MFR(230℃/3.8 kg) | ASTM D1238 | 1.8 | g/10min | |
| Molding shrinkage | ASTM D955 | 0.2‑0.6 | % | |
| Bulk density | ASTM D1182 | 0.77 | g/cm³ | |
| Refractive index | ASTM D542 | 1.491 | — | |
| Light transmittance (3.2 mm) | ASTM D1003 | 92 | % | |
| Mechanical | Tensile strength (break) | ASTM D638 | 73 | MPa |
| Elongation at break | ASTM D638 | 5.0 | % | |
| Flexural strength | ASTM D790 | 107 | MPa | |
| Izod notched impact | ASTM D256 | 2.0 | kJ/m² | |
| Rockwell hardness‑M | ASTM D785 | M95 | — | |
| Thermal | HDT (1.8 MPa) | ASTM D648 | 100 | ℃ |
| Vicat softening temperature | ASTM D1525 | 113 | ℃ | |
| Flammability | UL94 (1.5 mm) | UL94 | HB | class |
Injection‑Molding Parameters
表格
| Process | Item | Recommendation | Notes |
|---|---|---|---|
| Predrying | Drying temperature | 80‑90 ℃ | Desiccant dryer required; target moisture 0.02%‑0.1% |
| Drying time | 2‑4 h | Adjust with humidity, regrind ratio & storage condition | |
| Barrel setting | Rear zone | 185‑205 ℃ | Low‑flow heat‑resistant grade, higher processing temperature needed |
| Middle zone | 220‑240 ℃ | ||
| Front zone | 210‑230 ℃ | ||
| Nozzle | 210‑230 ℃ | ||
| Melt temperature | 210‑250 ℃ | Decomposition temperature＞270 ℃; hot runner ≤240 ℃ to prevent degradation | |
| Mold temperature | 50‑70 ℃ | Adjust by wall‑thickness, size and gating system | |
| Injection pressure | 70‑90 MPa | Higher pressure required for low‑flow material | |
| Injection speed | Medium | High speed causes surface defects & internal stress | |
| Back pressure | 0.5‑1.0 MPa | For melt homogenization | |
| Screw speed | Medium | Avoid excessive shear rate |
Note: All data for reference only, follow official TDS for mass‑production.
