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Factors and levels used in the design of the experiments and statistical analysis of the modification procedure.
| Independent Variables (Factors) |
Levels | |||||
|---|---|---|---|---|---|---|
| Axis (−) |
Corner (−) |
Central Point | Corner (+) | Axis (+) |
||
| A | FSiT ratio | 0.17 | 0.29 | 0.55 | 0.79 | 0.94 |
| B | FSiT%v, % | 0.8 | 2.4 | 4.6 | 7.2 | 9.2 |
| C | NaOH%wt, % | 1.0 | 2.0 | 3.5 | 5.0 | 6.0 |
