Power Requirements
The power required for this process of injection molding depends on many things and varies between materials used. Manufacturing Processes Reference Guide states that the power requirements depend on "a material's specific gravity, melting point, thermal conductivity, part size, and molding rate." Below is a table from page 243 of the same reference as previously mentioned that best illustrates the characteristics relevant to the power required for the most commonly used materials.
| Material | Specific gravity (g/cm3) | Melting point (°F) | Melting point (°C) |
|---|---|---|---|
| Epoxy | 1.12 to 1.24 | 248 | 120 |
| Phenolic | 1.34 to 1.95 | 248 | 120 |
| Nylon | 1.01 to 1.15 | 381 to 509 | 194 to 265 |
| Polyethylene | 0.91 to 0.965 | 230 to 243 | 110 to 117 |
| Polystyrene | 1.04 to 1.07 | 338 | 170 |
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“The distinction, which we often make betwixt power and the exercise of it, is equally without foundation.”
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