PMMA Mitsubishi Chemical IR‑D70
PMMA Mitsubishi Chemical IR‑D70
PMMA Mitsubishi Chemical IR‑D70 is high‑impact, high‑transparency polymethyl methacrylate. It delivers good chemical resistance, excellent mechanical toughness, favorable weather‑resistance and UV‑resistance.
Main Applications
Electrical & electronics: electrical appliances and electronic components, taking advantage of volume resistivity, dielectric strength and chemical resistance.
Automotive industry: signal lamps, instrument panels, benefiting from high hardness, impact‑resistance and weather‑resistance.
Optical applications: optical lenses.
Industrial applications: pipes, profiles.
Daily‑use goods: stationery, bathroom products.
Properties
表格
| Property Category | Item | Test Standard | Value | Unit |
|---|---|---|---|---|
| Physical | Density | ASTM D792 | 1.14 | g/cm³ |
| Water absorption (24 h) | ASTM D570 | 0.4 | % | |
| MFR(230℃/3.8 kg) | ASTM D1238 | 1.3 | g/10min | |
| Molding shrinkage (flow direction) | ASTM D955 | 0.4‑0.8 | % | |
| Refractive index | ASTM D542 | 1.49 | — | |
| Light transmittance (3.2 mm) | ASTM D1003 | 92 | % | |
| Haze | ASTM D1003 | 2.0 | % | |
| Mechanical | Tensile strength (break) | ASTM D638 | 29.4‑29.6 | MPa |
| Elongation at break | ASTM D638 | 90 | % | |
| Flexural strength | ASTM D790 | 39.2‑39.3 | MPa | |
| Flexural modulus | ASTM D790 | 1270‑1280 | MPa | |
| Izod notched impact | ASTM D256 | 68.6‑69 | J/m | |
| Rockwell hardness‑M | ASTM D785 | M32 | — | |
| Rockwell hardness‑R | ASTM D785 | R85 | — | |
| Thermal | HDT (1.8 MPa, un‑annealed) | ASTM D648 | 80 | ℃ |
| Vicat softening temperature | ASTM D1525 | 95 | ℃ | |
| Linear thermal expansion coefficient | ASTM D696 | 11.5×10⁻⁵ | cm/cm/℃ | |
| Thermal conductivity | ASTM C177 | 0.21 | W/m/K | |
| Specific heat | ASTM C351 | 1460 | J/kg/℃ | |
| Electrical | Volume resistivity | ASTM D257 | 1.0×10¹⁵ | Ω·cm |
| Surface resistivity | ASTM D257 | 1.0×10¹⁶ | Ω | |
| Dielectric strength | ASTM D149 | 15 | kV/mm | |
| Dielectric constant (60 Hz) | ASTM D150 | 3.90 | — | |
| Dissipation factor (60 Hz) | ASTM D150 | 0.040 | — | |
| 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 |
| Drying time | 2‑4 h | Target moisture＜0.1%, prevent bubbles & silver‑streaks | |
| Barrel setting | Rear zone | 185‑205 ℃ | Avoid long residence time to prevent degradation |
| Middle zone | 220‑240 ℃ | ||
| Front zone | 210‑230 ℃ | ||
| Nozzle | 210‑230 ℃ | ||
| Melt temperature | 210‑230 ℃ | ||
| Mold temperature | 50‑70 ℃ | Fast cooling tends to induce internal stress | |
| Injection pressure | Adjust per product & mold | High melt viscosity, control pressure for full filling & good appearance | |
| Injection speed | Medium | Excess speed causes surface defects & internal stress |
Note: All data for reference only, refer to official TDS for mass‑production.
