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The values of factors for mixed two-level and three-level factorial designs.
| Total Polymer Concentration (%) | Factors | Low Level | Zero Level | High Level |
|---|---|---|---|---|
| 2% | Concentration of SA (x1) | 1 | - | 1.33 |
| Concentration of GLY (x2) | 1 | 3 | 5 | |
| 3% | Concentration of SA (x1) | 1.5 | - | 2 |
| Concentration of GLY (x2) | 1 | 3 | 5 |
