PMMA LG Chem HP202
PMMA LG Chem HP202
PMMA LG Chem HP202 is injection‑molding grade polymethyl methacrylate. It combines good optical transparency, excellent heat‑resistance, good weather‑resistance, balanced mechanical properties and processability for multiple application fields.
Main Applications
Optical components & lenses: optical lenses.
Electrical & electronics: LCD & backlight units, optical lenses, LED lamp housings, display devices, decorative parts requiring high weather‑resistance & impact performance.
Automotive parts: automotive lamp housings, instrument panels.
Consumer goods: cosmetic containers, home‑appliance components, IT panels.
Properties
表格
| Property Category | Item | Test Standard | Value | Unit |
|---|---|---|---|---|
| Physical | Density | ASTM D792 | 1.18 | g/cm³ |
| Water absorption (24h,23℃) | ASTM D570 | 0.3 | % | |
| MFR(230℃/3.8 kg) | ASTM D1238 | 2.0 | g/10min | |
| Molding shrinkage (flow direction) | ASTM D955 | 0.20‑0.60 | % | |
| Refractive index | ASTM D542 | 1.49 | — | |
| Light transmittance (3.2 mm) | ASTM D1003 | 92 | % | |
| Haze (3.2 mm) | ASTM D1003 | ＜0.10 | % | |
| Mechanical | Tensile strength (yield) | ASTM D638 | 68.6 | MPa |
| Flexural strength | ASTM D790 | 137 | MPa | |
| Flexural modulus | ASTM D790 | 3330 | MPa | |
| Elongation at break | ASTM D638 | 15 | % | |
| Rockwell hardness‑M | ASTM D785 | M98 | — | |
| Izod notched impact (23℃) | ASTM D256 | 1.50 | J/m | |
| Thermal | HDT (1.8 MPa, annealed) | ASTM D648 | 104 | ℃ |
| Vicat softening temperature | ASTM D1525 | 117 | ℃ | |
| Linear thermal expansion coefficient | ASTM D696 | 6.0×10⁻⁵ | cm/cm/℃ | |
| Electrical | Volume resistivity | ASTM D257 | 1.0×10¹⁵ | Ω·cm |
| Dielectric strength | ASTM D149 | 20 | kV/mm | |
| Dielectric constant (60Hz) | ASTM D150 | 3.1 | — | |
| Dissipation factor (60Hz) | ASTM D150 | 0.05 | — |
Injection‑Molding Parameters
表格
| Process | Item | Recommendation | Notes |
|---|---|---|---|
| Predrying | Drying temperature | 80‑85 ℃ | Desiccant dryer required |
| Drying time | 2.0‑4.0 h | Suggest 4‑5 h; moisture＜0.1% to avoid bubbles & silver‑streaks | |
| Barrel setting | Rear zone | 185‑205 ℃ | Melt onset ~160 ℃, thermal decomposition＞270 ℃ |
| Middle zone | 220‑240 ℃ | Strictly control residence time | |
| Front zone | 210‑230 ℃ | ||
| Nozzle temperature | 210‑230 ℃ | ||
| Melt temperature | 210‑230 ℃ | Prevent thermal degradation | |
| Mold temperature | 70‑80 ℃ | High‑viscosity grade, easy to generate internal stress | |
| Injection pressure | Adjust per product & mold | Adopt minimum feasible pressure for full filling | |
| Injection speed | Medium | Excessive speed causes surface defects & residual stress | |
| Back pressure | 0.5‑1.0 MPa | Low back‑pressure for melt homogenization | |
| Screw speed | Medium (50‑70 rpm) | Avoid excessive shear heating |
Note: All data for reference only, refer to official TDS for mass‑production.
Current list updated: Add LG Chem HP202 PMMA series: Evonik 8N、Evonik 7N、Wanhua SF01、Wanhua HD03、Wanhua HD01、Chimei CM‑211、Chimei CM‑207、Chimei CM‑205、Shuangxiang SX‑304、SABIC P20MH、Mitsubishi VH001、Mitsubishi MF001、Mitsubishi IR‑D70、Sumitomo MH、Sumitomo LG2、Arkema V150、Arkema V040、Arkema DR101、LG Chem IH830、LG Chem HP202
