PC-Teijin Panlite L-1250Y
PC-Teijin Panlite L-1250Y is a medium-viscosity, general-purpose polycarbonate resin developed by Teijin, formulated with integrated easy-release additives for high-yield precision molding. Featuring a melt volume-flow rate (MVR) of 8.0 cm³/10 min (at 300°C/1.2kg) and an ISO Charpy notched impact strength of 76 kJ/m², this grade offers a high refractive index of 1.585 and 88% light transmittance. Jucheng Precision, under IATF 16949 and ISO 9001 quality frameworks, specializes in molding Panlite L-1250Y for optical and industrial components. Using 5-axis CNC-machined S136 tool cavities and 35+ advanced presses, we control thermal stress and ensure uniform crystallization, verified by Zeiss CMM inspection.
Teijin Panlite L-1250Y Optical & Physical Profile
Panlite® L-1250Y is a premium, medium-viscosity polycarbonate resin engineered by Teijin Limited to deliver excellent optical clarity, high dimensional stability, and easy mold release:
| Physical & Optical Attribute | Panlite L-1250Y Nominal Metric | Optical Molding Advantage |
|---|---|---|
| Light Transmittance | 88.0% Optical Transmission (3.0 mm) | Delivers brilliant, crystal-clear transparency directly from mirror-polished core cavities. Ideal for protective covers, light guides, and display lenses. |
| Refractive Index | High Refractive Index 1.585 | Optimizes light ray guidance and dispersion within thick-walled ambient light pipes, eliminating internal refraction loss. |
| Thermal Resistance | Vicat Softening Point 149°C | Maintains unyielding structural geometry under high operational heat, perfectly suited for automotive headlights and industrial sensor casings. |
Process & Flow Capability for Medium-Viscosity Panlite L-1250Y
With intermediate melt viscosity and built-in release additives, Panlite L-1250Y solidifies predictably to yield clear structures:
| Molding Process | Molding Compatibility & Operational Details |
|---|---|
| General Purpose Clear Molding | Excellent. Fully optimized for high-transparency surveillance camera domes, thick-walled lightguides, prisms, and optical lenses. |
| Outdoor Lens Enclosures | Excellent. Ideal for heavy-duty industrial electricity meter covers, safety helmets, marine signal lens caps, and protective shields. |
| Multi-Cavity Unmanned Runs | Excellent. Built-in, high-efficiency mold release additives facilitate rapid and clean ejection, avoiding part scuffing during automated runs. |
PC-Teijin Panlite L-1250Y Tooling & Optical Defect Mitigation Guide
Molding an optical-grade, medium-viscosity resin like Panlite L-1250Y requires precise mold temperature control and zero-moisture drying to protect optical clarity:
- Pristine Optical Polishing (S136 steel): Microscopic tool marks on core or cavity surfaces will scatter light, causing optical haze. Jucheng’s tooling division uses premium S136 stainless steel mold cavity inserts, mirror-polished to a high level, ensuring parts emerge with flawless, glass-like clarity.
- Desiccant Drying & Splay Prevention: Wet PC is highly susceptible to hydrolytic polymer chain fracture, destroying mechanical strength and causing splay or silver streaks. We dry raw resin in desiccant hopper dryers at 120°C (248°F) for 3–4 hours, keeping moisture strictly below 0.02%.
- Low Internal Stress (Molding Temperatures): Processing barrel temperatures are maintained between 280°C and 320°C (536°F to 608°F). Mold temperatures are kept at 80°C to 110°C (176°F to 230°F) to ensure maximum gloss and reduce residual internal molding stresses.
- Shrinkage & Warpage: Panlite L-1250Y exhibits low and highly uniform shrinkage (0.5% to 0.7%). We machine balanced, conformal cooling circuits directly into core blocks to speed up heat dissipation, further reducing cycle times and preventing thermal warpage.
Key Application Fields for PC-Teijin Panlite L-1250Y
- Automotive Lighting & Guides (IATF 16949): Ambient lightguides, headlight lenses, clear rear light covers, dashboard buttons, and sunroof frames.
- Electrical & Smart-Grid Hardware: Transparent power meter covers, high-voltage connector blocks, outdoor industrial switch boxes, and LED panel housings.
- Consumer & Safety Products: Protective face shields, surveillance camera domes, safety helmets, clear cups, and structural drone components.
Properties
| Density | 1.2 g/cm³ |
| Melt Volume-Flow Rate (MVR) (300°C/1.2kg) | 8 cm³/10min |
| Light Transmittance (3.0 mm) | 88 % |
| Refractive Index | 1.585 - |
| Tensile Modulus | 2,400 MPa |
| Tensile Yield Stress | 61 MPa |
| Tensile Yield Strain | 6 % |
| Flexural Modulus | 2300 MPa |
| Flexural Strength | 91 MPa |
| Charpy Notched Impact Strength (23°C) | 76 kJ/m² |
| Rockwell Hardness (M-Scale) | 77 - |
| Vicat Softening Point | 149 °C |
| Heat Deflection Temperature (HDT @ 0.45 MPa) | 142 °C |
| Heat Deflection Temperature (HDT @ 1.80 MPa) | 129 °C |
| Linear Mold Shrinkage | 0.50 - 0.70 % |
| Flammability Rating (1.5mm) | UL 94 HB - |
| Maximum Part Size | 1000 x 800 mm |
| Minimum Part Size | 1 x 1 mm |