Injection Molding Process Data: PA66 (Nylon 6/6) to PET (Polyethylene Terephthalate)
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 | drying temp C (degC) | drying time hr (hr) | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PA66 (Nylon 6/6) | 1 | Yes | 80 | 4 | 100 | semicrystalline_engineering | 6 | 290 | 260 | 0.8 | 2 | 1 | 80 | 60 | Higher melting point than PA6; better heat resistance; sharp melting point requires precise control |
| PA12 (Nylon 12) | 1 | Yes | 80 | 4 | 90 | semicrystalline_engineering | 6 | 260 | 220 | 0.8 | 1.5 | 0.9 | 80 | 40 | Lower moisture absorption than PA6/PA66; flexible; used in tubing and fuel lines |
| PBT (Polybutylene Terephthalate) | 1.5 | Yes | 120 | 4 | 90 | semicrystalline_engineering | 6 | 270 | 230 | 0.8 | 1.5 | 0.3 | 80 | 40 | Crystallizes rapidly; fast cycle times; good chemical and electrical resistance |
| PET (Polyethylene Terephthalate) | 2 | Yes | 150 | 4 | 100 | semicrystalline_engineering | 4 | 275 | 255 | 0.8 | 1.2 | 0.4 | 30 | 10 | Mold temp critical for crystallinity; low mold temp = amorphous/clear; high mold temp = crystalline/opaque |
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