PMMA Mitsubishi Chemical IRD70 (IR‑D70)
PMMA Mitsubishi Chemical IRD70 (IR‑D70)
PMMA Mitsubishi Chemical IRD70 is high‑impact, high‑transparency, high‑gloss resin. It possesses good chemical resistance, excellent mechanical performance, weather‑resistance and UV‑resistance.
Main Applications
Electrical & electronics: electrical appliances and electronic components, benefited from high volume resistivity, dielectric strength and chemical resistance.
Automotive industry: signal lamps, instrument panels, relying on high hardness, impact‑resistance and weather‑resistance.
Optical applications: optical lenses, transmittance 92%, haze 2.0%.
Daily‑use goods: stationery, bathroom articles.
Industrial applications: pipes, profiles.
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 | 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 | 29.4‑30.0 | 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 | — | |
| Thermal | HDT (1.8 MPa) | ASTM D648 | 80 | ℃ |
| Vicat softening temperature | ASTM D1525 | 95 | ℃ | |
| Linear thermal expansion coefficient | ASTM D696 | 1.15E‑4 ~1.2E‑4 | cm/cm/℃ | |
| Electrical | Volume resistivity | ASTM D257 | 1.0E+15 | Ω·cm |
| Surface resistivity | ASTM D257 | 1.0E+16 | Ω | |
| Dielectric strength | ASTM D149 | 15 | kV/mm | |
| Dielectric constant (60 Hz) | ASTM D150 | 3.90 | — | |
| 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 ℃ | Strictly control residence time to avoid degradation |
| Middle zone | 220‑240 ℃ | ||
| Front zone | 210‑230 ℃ | ||
| Nozzle temperature | 210‑230 ℃ | ||
| Melt temperature | 210‑230 ℃ | ||
| Mold temperature | 50‑70 ℃ | ||
| Injection pressure | Adjust by product & mold | Ensure full filling and good appearance | |
| Injection speed | Medium | High speed may trigger surface defects & internal stress |
Note: All data for reference only, refer to official TDS for mass‑production.
