HIPS Formosa Plastics Ningbo HP‑825T
HIPS Formosa Plastics Ningbo HP‑825T
Material Introduction: HIPS Formosa Plastics Ningbo HP‑825T is a high‑flow grade high‑impact polystyrene plastic. It achieves a good balance of high flowability, favorable impact resistance and processing efficiency.
Main Applications
Printer housings, outer layers for extruded‑foam decorative materials, TV rear housings.
Physical Properties
| Performance Category | Test Item | Reference Test Standard | Unit | Typical Value / Range |
|---|---|---|---|---|
| Physical Properties | Melt Flow Rate (MFR) | ASTM D1238 (200°C/5kg) | g/10min | 11 |
| Density | ASTM D792 | g/cm³ | ~1.04 (typical value for HIPS) | |
| Mechanical Properties | Izod Notched Impact Strength (1/4") | ASTM D256 | J/m (or kg·cm/cm) | 11.5 (115 J/m) |
| Flexural Modulus (FM) | ASTM D790 | MPa (or kg/cm²) | 22000 (approx. 2158 MPa) | |
| Tensile Strength (TS) | ASTM D638 | MPa (or kg/cm²) | 230 (approx. 22.5 MPa) | |
| Thermal Properties | Heat‑Distortion Temperature (HDT) | ASTM D648 | °C | ~88 (common value for HIPS) |
| Vicat Softening Temperature | ASTM D1525 | °C | ~95 (common value for HIPS) | |
| Flame‑Retardant Properties | Flammability (UL94) | UL94 | ‑ | HB (File No. E162823) |
| Other Properties | Residual Styrene Monomer | ‑ | ppm max | ≤700 (common value for HIPS) |
| Mold Shrinkage | ASTM D955 | % | 0.4‑0.7 (typical value for HIPS) |
Injection Molding Parameters
| Process Parameter | Reference Range / Recommendation | Remarks & Descriptions |
|---|---|---|
| Drying Treatment | Normally unnecessary; dry at 70‑80°C for 2‑3 hours under improper storage conditions | HIPS has low water absorption (generally below 0.1 %), drying is normally not required. Drying is recommended under high‑humidity environment, with regrind material added or abnormal storage. |
| Barrel Temperature | 180‑220°C (or 190‑240°C) | HP‑825T is a high‑flow grade; barrel temperature can be set at the lower‑to‑middle part of the range. Reference setting: rear zone 190°C, middle zone 200°C, front zone 205°C, nozzle 210°C. |
| Mold Temperature | 20‑70°C (or 40‑60°C) | Higher mold temperature helps reduce internal stress and improve surface gloss of molded parts. |
| Injection Pressure | Medium‑to‑low (due to good flowability) | Sufficient holding pressure, holding time and cooling time are required. Holding pressure is normally 90 % of injection pressure. |
| Injection Speed | Medium‑to‑fast | High flowability allows relatively fast injection speed. Excessively fast speed may cause flash; too slow speed leads to obvious weld lines. Start with medium speed. |
| Back Pressure | 0.5‑1.0 MPa (general HIPS recommendation) | Proper back pressure contributes to melt homogenization. |
| Screw Speed | Medium (e.g. 50‑100 rpm, general HIPS recommendation) | Avoid excessive screw speed to prevent shear overheating. |
Disclaimer: All above data is for reference only.
