HIPS Formosa Plastics Ningbo HP‑8250
HIPS Formosa Plastics Ningbo HP‑8250
Material Introduction: HIPS Formosa Plastics Ningbo HP‑8250 is a high‑impact polystyrene plastic. Featuring high impact resistance, favorable heat resistance, good mechanical strength and stable processability, it is widely used in fields such as electrical appliance housings.
Main Applications
Home‑appliance housings (TV sets, air conditioners, etc.), terminal equipment housings, computer main‑unit panels, office‑equipment housings.
Physical Properties
| Performance Category | Test Item | Reference Test Standard | Unit | Typical Value / Range |
|---|---|---|---|---|
| Physical Properties | Density | ASTM D792 | g/cm³ | 1.04 |
| Melt Flow Rate (MFR) | ASTM D1238 (200°C/5kg) | g/10min | 5.5 | |
| Mechanical Properties | Tensile Strength | ASTM D638 | MPa (or kg/cm²) | 23 or 220‑240 |
| Elongation at Break | ASTM D638 | % | 40 or 53 | |
| Flexural Strength | ASTM D790 | MPa (or kg/cm²) | 43 or 440‑450 | |
| Flexural Modulus | ASTM D790 | MPa (or kg/cm²) | 2260 or 22000‑23000 | |
| Izod Notched Impact Strength (1/4") | ASTM D256 | J/m (or kg·cm/cm) | 108‑110 or 11.5‑13 | |
| Thermal Properties | Heat‑Distortion Temperature (HDT, 1.8 MPa, unannealed) | ASTM D648 | °C | 88‑90 |
| Vicat Softening Temperature | ASTM D1525 | °C | 95‑97 or 101 | |
| Other Properties | Residual Styrene Monomer | ‑ | ppm max | ≤700 |
| Flammability (UL94) | UL94 | ‑ | HB (0.8mm‑3.0mm) | |
| Mold Shrinkage | ‑ | % | 0.4‑0.6 |
Injection Molding Parameters
| Process Parameter | Reference Range / Recommendation | Remarks & Description |
|---|---|---|
| Drying Treatment | 70‑75°C for 1‑2 hours | HIPS has low water absorption; drying is generally unnecessary. Drying is recommended when regrind material is included, under high‑humidity environment or abnormal storage conditions. |
| Barrel Temperature | 180‑220°C or 190‑210°C | Reference barrel setting: rear zone 190°C, middle zone 200°C, front zone 210°C. |
| Mold Temperature | 20‑70°C | Higher mold temperature helps reduce internal stress. |
| Injection Pressure | ‑ | Holding pressure is normally 90 % of injection pressure. Sufficient holding pressure, holding time and cooling time are required. |
| Injection Speed | High injection speed is recommended | Excessively fast speed tends to cause flash; too slow speed results in obvious weld lines. Start with medium speed. |
| Back Pressure | ‑ | ‑ |
| Screw Speed | ‑ | ‑ |
Disclaimer: All above data is for reference only.
