Injection Molding Process Data: HDPE to HIPS (High-Impact PS)
Injection molding process parameters for thermoplastics — melt temperature, mold temperature, injection pressure, drying conditions, shrinkage, and wall thickness guidelines
| material | draft angle deg (deg) | drying required | injection pressure typical MPa (MPa) | material family | max wall thickness mm (mm) | melt temp max C (degC) | melt temp min C (degC) | min wall thickness mm (mm) | mold shrinkage pct max (%) | mold shrinkage pct min (%) | mold temp max C (degC) | mold temp min C (degC) | notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HDPE | 1 | No | 80 | polyolefin | 6 | 280 | 220 | 0.8 | 2.5 | 1.2 | 60 | 20 | Susceptible to warping in thick sections; ESCR consideration for parts in contact with chemicals |
| LDPE | 1 | No | 70 | polyolefin | 5 | 240 | 180 | 0.8 | 4 | 1.5 | 50 | 20 | High shrinkage; soft flexible parts; lower stiffness than HDPE |
| PP (Polypropylene) | 1 | No | 80 | polyolefin | 6 | 280 | 220 | 0.8 | 2.5 | 1.2 | 70 | 20 | Living hinges possible; good chemical resistance; susceptible to UV degradation |
| PS (Polystyrene GPPS) | 1 | No | 80 | styrenics | 6 | 280 | 180 | 0.8 | 0.6 | 0.3 | 60 | 20 | Brittle; excellent for clear rigid parts; excellent dimensional stability |
| HIPS (High-Impact PS) | 1.5 | No | 75 | styrenics | 6 | 260 | 180 | 0.8 | 0.6 | 0.3 | 60 | 10 | Improved impact strength vs GPPS; toughened with rubber phase |
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