PMMA CHIMEI CM‑211
PMMA CHIMEI CM‑211
PMMA CHIMEI CM‑211 is high‑flow polymethyl methacrylate. It delivers excellent optical performance, balanced mechanical properties, good heat‑resistance and weather‑resistance, well‑suited for fast‑fill and complex‑structure injection‑molded articles.
Main Applications
Electrical & electronics: nameplates, speaker panels, instrument housings, electronic outer covers.
Consumer goods: household appliances, stationery.
Decorative parts: complicated‑shape decorative articles difficult for injection molding.
Lighting: lamp covers, diffusion panels.
Automotive: automotive lamp components.
Properties
表格
| Property Category | Item | Test Standard | Value | Unit |
|---|---|---|---|---|
| Physical | Density | ISO 1183 | 1.19 | g/cm³ |
| Water absorption (24 h) | ISO 62 | 0.3 | % | |
| MVR(230℃/3.8 kg) | ISO 1133 | 53 | cm³/10min | |
| 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 | % | |
| Mechanical | Tensile strength (break) | ISO 527‑2 | 68 | MPa |
| Elongation at break | ISO 527‑2 | 10 | % | |
| Flexural strength | ISO 178 | 95 | MPa | |
| Flexural modulus | ISO 178 | 2700 | MPa | |
| Charpy notched impact(23℃) | ISO 179/1eA | 2.00 | kJ/m² | |
| Charpy un‑notched impact(23℃) | ISO 179/1eU | 23 | kJ/m² | |
| Rockwell hardness‑M | ASTM D785 | M84 | — | |
| Ball indentation hardness | ISO 2039‑1 | 148 | MPa | |
| Thermal | HDT 1.8 MPa(annealed) | ISO 75‑2/A | 98 | ℃ |
| HDT 1.8 MPa(un‑annealed) | ISO 75‑2/Af | 78 | ℃ | |
| Vicat B50 | ISO 306 | 96 | ℃ | |
| 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 | 70‑75 ℃ / 80‑85 ℃ | Desiccant dryer; target moisture＜0.1 % |
| Drying time | 4 h | Prevent silver‑streaks & bubbles | |
| Barrel setting | Nozzle | 190‑220 ℃ | Use shallow‑flight screw to avoid frictional degradation / yellowing |
| Front zone | 190‑210 ℃ | ||
| Middle zone | 180‑200 ℃ | ||
| Rear zone | 170‑190 ℃ | ||
| Melt temperature | 190‑220 ℃ | Avoid over‑temperature & long residence time | |
| Mold temperature | 50‑70 ℃ | Adjust by wall‑thickness & gating | |
| Injection speed | Medium‑high | Take advantage of high flow for thin‑wall filling | |
| Back pressure | 0.5‑1.0 MPa | Low back‑pressure for melt homogenization |
Note: All data for reference only, follow official TDS for final production.
