GPPS Chi‑Mei PG‑33
GPPS Chi‑Mei PG‑33
GPPS Chi‑Mei PG‑33 from Taiwan is a widely‑used general‑purpose polystyrene. It features high transparency, high gloss, good flowability, safety & environmental friendliness, favorable rigidity and easy processability for broad applications.
Main Applications
Transparent food containers, lamp shades, daily necessities, toys, stationery, cosmetic containers, indoor and outdoor ornaments, etc.
Property Data
| Property Category | Test Item | Test Standard | Unit | Typical Value / Range |
|---|---|---|---|---|
| Physical Properties | Density | ASTM D792 | g/cm³ | 1.04‑1.05 |
| Melt Flow Rate (MFR) | ASTM D1238 (200 °C / 5.0 kg) | g/10min | 8.0 | |
| Mechanical Properties | Tensile Strength (Yield) | ISO 527‑2/50 | MPa | 41.0 |
| Tensile Strength (Break) | ASTM D638 | MPa | 45.0‑45.1 | |
| Elongation at Break | ASTM D638 | % | 2.0 | |
| Flexural Strength | ASTM D790 | MPa | 65.6‑65.7 | |
| Flexural Modulus | ASTM D790 | MPa | 3030‑3040 | |
| Izod Notched Impact Strength (23 °C) | ASTM D256 | J/m | 17 | |
| Rockwell Hardness (M Scale) | ASTM D785 | ‑ | 77 | |
| Thermal Properties | Heat Deflection Temperature (HDT, 1.8 MPa, Unannealed) | ASTM D648 | °C | 79.0 |
| Heat Deflection Temperature (HDT, 1.8 MPa, Annealed) | ASTM D648 | °C | 87.0 | |
| Vicat Softening Temperature | ASTM D1525 | °C | 94.0‑96.0 | |
| Optical Properties | Appearance | ‑ | ‑ | Highly transparent |
| Flammability | UL 94 Rating (1.5 mm) | UL 94 | ‑ | HB |
Injection Molding Parameters
| Process Parameter | Reference Range / Recommendation | Remarks & Notes |
|---|---|---|
| Drying | 80 °C, 2‑3 hours | PS has low moisture absorption. Drying is recommended if recycled content is present, ambient humidity is high or storage is abnormal. |
| Barrel Temperature | Feed zone: 150‑170 °C Compression zone: 175‑195 °C Nozzle: 185‑205 °C |
|
| Mold Temperature | 40‑70 °C | Adjust according to part thickness, dimension, gate and runner system. |
| Melt Temperature | ‑ | Polystyrene has a broad melting range and good thermal stability. |
| Precautions | ‑ | Keep resin free from dust and contaminants; avoid long‑term melt residence in heated barrel; hot‑runner temperature shall not exceed 230 °C. |
Note: All data above is for reference only!
