Table 4.
Candidates for the optimal eco-friendly graffiti remover proposed by d-optimal model optimization based on desirability function and comparison of predicted and actual values.
| No. | Formulation Number a | Type of Oil | Viscosity (mPa∙s) | Density (g/cm3) | Runoff Speed (s) | Effectiveness (%) | Desirability | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| P b | A c | P | A | P | A | P | A | ||||
| 1 | MG-400-RO-20 | RO | 38.7 | 37.8 | 1.04 | 1.04 | 26.8 | 26.0 | 68.5 | 75.0 | 0.907 |
| 2 | MG-400-RO-1 | RO | 36.5 | 33.8 | 1.04 | 1.04 | 22.8 | 21.0 | 65.9 | 72.5 | 0.870 |
| 3 | MG-400-UCO-1 | UCO | 45.7 | 36.3 | 1.03 | 1.03 | 23.4 | 20.0 | 63.3 | 75.0 | 0.833 |
| 4 | MG-400-UCO-20 | UCO | 41.0 | 45.5 | 1.03 | 1.04 | 25.9 | 24.0 | 60.1 | 70.0 | 0.786 |
| 5 | MG-400-SO-1 | SO | 57.6 | 48.2 | 1.03 | 1.03 | 22.6 | 20.0 | 59.9 | 65.0 | 0.784 |
| 6 | MG-400-SO-20 | SO | 41.5 | 44.3 | 1.04 | 1.04 | 17.3 | 17.0 | 50.7 | 42.5 | 0.653 |
a As presented in Table 3; b Value predicted by the d-optimal model; c Actual experimental value.