Table 1.
Levels and conditions of the full factorial design.
| Experiment | Temperature (Level) | Time (Level) | Temperature | Time |
|---|---|---|---|---|
| 1 | –1 | –1 | 120 °C | 30 |
| 2 | 1 | –1 | 170 °C | 15 |
| 3 | –1 | 1 | 120 °C | 60 |
| 4 | 1 | 1 | 170 °C | 30 |
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