PC Chi Mei (Taiwan) PC‑122
PC Chi Mei (Taiwan) PC‑122
Material Introduction: PC Chi Mei (Taiwan) PC‑122 is a high‑flow, flame‑retardant, transparent polycarbonate grade. It delivers high flowability, favorable heat resistance, good mechanical strength, excellent optical performance and electrical insulation.
Main Applications
- Electronic & Electrical Components: Ultra‑thin mobile phone housings, notebook‑computer interfaces, USB connectors, smart‑home controllers, LED lamp bases, relay housings, capacitor housings, coil bobbins, insulating connectors, telephone housings and parts, switches, etc.
- Automotive Parts: Automotive sensor housings, wire‑harness connectors, fuse‑box assemblies and other components.
- Food‑Contact Articles: Supported by FDA certification, widely used for water‑holding containers, food containers, bottles and similar products.
- Consumer & Industrial Goods: Thin‑wall and complex transparent molded articles such as pen barrels, stationery, toys, tableware, baby bottles and models.
- Mechanical Equipment: Gears, racks, worm gears, bearings, cams, bolts, as well as shields, covers and frames for mechanical components.
- Optical Lighting: Large lamp shades, protective glazing.
Physical & Mechanical Properties
| Property Category | Performance Parameter | Test Standard | Value / Range | Unit |
|---|---|---|---|---|
| Physical Properties | Density | ASTM D792 | 1.20 | g/cm³ |
| Melt Mass‑Flow Rate (MFR) | ASTM D1238 (300°C / 1.2 kg) | 18‑22 | g/10 min | |
| Water Absorption (23°C, 24hr) | ASTM D570 | 0.20 | % | |
| Molding Shrinkage (Flow Direction) | ASTM D955 | 0.5‑0.7 | % | |
| Molding Shrinkage (Transverse Direction) | ASTM D955 | 0.5‑0.7 | % | |
| Light Transmittance (3 mm) | ASTM D1003 | 89.0 | % | |
| Haze (3.2 mm) | ASTM D1003 | ＜0.80 | % | |
| Refractive Index | ASTM D542 | 1.585 | ‑ | |
| Mechanical Properties | Tensile Strength (Yield) | ASTM D638 | 61.8‑63.0 | MPa |
| Tensile Strength (Break) | ISO 527‑2/50 | 70.0 | MPa | |
| Elongation at Break | ASTM D638 | 90‑120 | % | |
| Flexural Strength | ASTM D790 | 90.0‑92.0 | MPa | |
| Flexural Modulus | ASTM D790 | 2350‑2400 | MPa | |
| Charpy Notched Impact Strength (23°C) | ISO 179 | 60 | kJ/m² | |
| Izod Notched Impact Strength (3.18 mm) | ASTM D256 | 780 (approx. 87) | J/m | |
| Rockwell Hardness (M‑scale) | ASTM D785 | M77 | ‑ | |
| Compressive Strength | ASTM D695 | 76.5‑78.0 | MPa | |
| Thermal Properties | Heat‑Distortion Temperature (1.8 MPa, Unannealed) | ASTM D648 | 125‑128 | °C |
| Heat‑Distortion Temperature (0.45 MPa, Unannealed) | ASTM D648 | 136 | °C | |
| Vicat Softening Temperature (B50) | ASTM D1525 | 145‑150 | °C | |
| Coefficient of Linear Thermal Expansion (Flow Direction) | ASTM D696 | 6.0‑8.0 × 10⁻⁵ | cm/cm/°C | |
| Thermal Conductivity | ASTM C177 | 0.20 | W/m/K | |
| Electrical Properties | Volume Resistivity | ASTM D257 | 3.0 × 10¹⁶ | Ω·cm |
| Dielectric Strength (1.6 mm) | ASTM D149 | 30 | kV/mm | |
| Relative Dielectric Constant (60 Hz) | ASTM D150 | 2.95 | ‑ | |
| Relative Dielectric Constant (1 MHz) | ASTM D150 | 2.90 | ‑ | |
| Dissipation Factor (60 Hz) | ASTM D150 | 0.0004 | ‑ | |
| Dissipation Factor (1 MHz) | ASTM D150 | 0.009 | ‑ | |
| Arc Resistance | ASTM D495 | 110 | sec | |
| Flame Retardant Performance | UL94 Rating (1.6 mm) | UL 94 | V‑2 | ‑ |
| UL94 Rating (3.2 mm) | UL 94 | V‑2 | ‑ |
Injection Molding Processing Parameters
| Processing Stage | Process Parameter | Suggested Value / Range | Unit | Remarks |
|---|---|---|---|---|
| Pre‑drying | Drying Temperature | 100‑120 | °C | Critical requirement |
| Drying Time | 3‑4 | h | Ensure moisture content ≤0.02% | |
| Recommended Dew Point | ＜‑40 °C (dehumidifying dryer recommended) | °C | General PC standard | |
| Injection Temperature | Rear Barrel Temperature | 220‑300 | °C | ‑ |
| Middle Barrel Temperature | 240‑310 | °C | ‑ | |
| Front Barrel Temperature | 240‑300 | °C | ‑ | |
| Nozzle Temperature | 10 °C lower than rear section | °C | ‑ | |
| Melt Temperature | 260‑310 | °C | Do not exceed 330°C | |
| Mold Temperature | 70‑120 | °C | ‑ | |
| Injection Pressure & Speed | Injection Pressure (screw‑type) | 70‑140 | MPa | ‑ |
| Holding Pressure | 50%‑80% of injection pressure | MPa | Adjust according to product structure | |
| Injection Speed | Medium‑to‑fast | ‑ | Multi‑stage injection (slow‑fast‑slow) is available for high flowability | |
| Other Parameters | Screw Speed | 30‑120 | rpm | ‑ |
| Back Pressure | 0.345‑0.689 | MPa | ‑ | |
| Cushion | 2‑6 | mm | ‑ |
Disclaimer: All above data is for reference only.
