PMMA CHIMEI CM‑207
PMMA CHIMEI CM‑207
PMMA CHIMEI CM‑207 is general‑purpose injection‑molding polymethyl methacrylate. It features good flowability, excellent transparency, favorable weather‑resistance, moderate heat‑resistance and balanced mechanical properties for multiple‑field applications.
Main Applications
Electrical & electronics: nameplates, speaker panels, instrument housings, electronic outer covers.
Automotive industry: taillights, signal lamp assemblies.
Optical components: sunglass lenses.
Mechanical parts: general‑purpose mechanical components.
Consumer goods: home‑appliance parts, stationery.
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 | 8.0‑9.0 | g/10min | |
| Bulk density | ASTM D1182 | 0.77 | g/cm³ | |
| Molding shrinkage | ASTM D955 | 0.002‑0.006 | mm/mm | |
| Refractive index | ASTM D542 | 1.491 | — | |
| Light transmittance (3.2 mm) | ASTM D1003 | 92‑93 | % | |
| Mechanical | Tensile strength (break) | ASTM D638 | 71.6 | MPa |
| Elongation at break | ASTM D638 | 5.0‑10 | % | |
| Flexural strength | ASTM D790 | 114 | MPa | |
| Rockwell hardness‑M | ASTM D785 | M85‑M90 | — | |
| Izod notched impact | ASTM D256 | 12 | J/m | |
| Charpy un‑notched impact | ISO 180/1U | 1.70 | kJ/m² | |
| Thermal | HDT 1.8 MPa(un‑annealed) | ASTM D648 / ISO 75‑2/A | 79‑92 | ℃ |
| Vicat B50 | ASTM D1525 / ISO 306/A50 | 105‑115 | ℃ | |
| Electrical | Volume resistivity | ASTM D257 | 10¹⁵ | Ω·cm |
| Dielectric strength | ASTM D149 | 500 | V/mil | |
| Dielectric constant (1 MHz) | ASTM D150 | 3.7 | — | |
| Dissipation factor (1 MHz) | ASTM D150 | 0.019‑0.05 | — | |
| Flammability | UL94 (1.5 mm) | UL94 | HB | class |
Injection‑Molding Parameters
表格
| Process | Item | Recommendation | Notes |
|---|---|---|---|
| Predrying | Drying temperature | 85‑90 ℃ | Desiccant dryer required; target moisture＜0.1 % |
| Drying time | 4 h | Prevent silver‑streaks & bubbles | |
| Barrel setting | Nozzle | 200‑230 ℃ | Adopt shallow‑flight screw to avoid frictional degradation / yellowing |
| Front zone | 210‑230 ℃ | ||
| Middle zone | 200‑220 ℃ | ||
| Rear zone | 180‑200 ℃ | Decomposition temperature＞270 ℃, avoid long residence time | |
| Melt temperature | 210‑230 ℃ | ||
| Mold temperature | 50‑70 ℃ | High viscosity & fast cooling, easy to generate internal stress | |
| Injection speed | Medium | Excess speed brings surface defects & internal stress | |
| Back pressure | 0.5‑1.0 MPa | Low back‑pressure for melt homogenization |
Note: All data for reference only, follow official TDS for mass‑production.
