HIPS Ningbo Liwan HP‑825
HIPS Ningbo Liwan HP‑825
Material Introduction: HIPS Ningbo Liwan HP‑825 is a plastic grade with good flowability. It features easy molding‑processing, good colorability, high‑impact resistance and excellent electrical‑insulation performance.
Main Applications
Electrical accessories (TV housings, commercial‑machine parts, monitor housings, printer housings), household‑appliance housings, toys, daily‑use articles, structural‑foam materials.
Physical Properties
| Performance Category | Test Item | Reference Test Standard | Unit | Typical Value / Reference Range |
|---|---|---|---|---|
| Physical Properties | Melt Flow Rate (MFR) | ASTM D1238 (200°C/5kg) | g/10min | 5.5‑9.0 (e.g. HP825F:9; HP8250:5.5) |
| Density | ASTM D792 | g/cm³ | ~1.04 (typical value for HIPS) | |
| Mechanical Properties | Tensile Strength | ASTM D638 | MPa (or kg/cm²) | 24‑26 MPa (or 240‑250 kg/cm²) |
| Flexural Strength | ASTM D790 | MPa (or kg/cm²) | 41‑46 MPa (or 450‑460 kg/cm²) | |
| Flexural Modulus | ASTM D790 | MPa (or kg/cm²) | 2100‑2400 MPa (or 21000‑24000 kg/cm²) | |
| Izod Notched Impact Strength (1/4") | ASTM D256 | J/m (or kg·cm/cm) | 108‑118 J/m (or 11‑12 kg·cm/cm) | |
| Elongation at Break | ASTM D638 | % | 33‑56% | |
| Thermal Properties | Heat‑Distortion Temperature (HDT,1.8 MPa, annealed) | ASTM D648 | °C | 89‑96°C |
| Vicat Softening Temperature (annealed) | ASTM D1525 | °C | 98‑101°C | |
| Other Properties | Residual Styrene Monomer | ‑ | ppm max | ≤700 |
| Flammability (UL94) | UL94 | ‑ | HB (1.5mm‑3.0mm) | |
| Mold Shrinkage | ASTM D955 | % | 0.4‑0.7 (flow direction, typical 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 or improper storage. |
| Barrel Temperature | 190‑240°C | Due to rubber component, relatively higher injection and molding temperature are preferred. |
| Mold Temperature | 40‑60°C | Higher mold temperature helps reduce internal stress. |
| Injection Pressure | Medium‑to‑high (e.g. 60‑150 MPa) | Sufficient holding pressure, holding time and cooling time are required. |
| Injection Speed | Medium speed | Avoid excessive speed causing molding defects. |
| 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
