Table 3.
Factors and parameter values used in the experimental design.
| Factor | Unit | Low | High | Centre | −α | +α | |
|---|---|---|---|---|---|---|---|
| A | Temperature | °C | 55 | 70 | 63 | 50 | 75 |
| B | Time | min | 15 | 45 | 30 | 5 | 55 |
| C | Stirrer Speed | rpm | 400 | 800 | 600 | 265 | 935 |
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