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| levels |
||||||
|---|---|---|---|---|---|---|
| variables | symbols | –2 | –1 | 0 | +1 | +2 |
| moisture content of the material (%) | x1 | 10 | 12 | 14 | 16 | 18 |
| forming pressure (kN) | x2 | 80 | 100 | 120 | 140 | 160 |
| mass percentage of straw (%) | x3 | 4 | 6 | 8 | 10 | 12 |
| forming temperature (°C) | x4 | 100 | 120 | 140 | 160 | 180 |
