| Samples | Concentration ratios (pphr) | ||||
| SBR | Stearic acid | ZnO | PbO | Pb(NO3)2 | |
| Control | 100 | 1 | 5 | - | - |
| PbO-30 | 100 | 1 | 5 | 30 | - |
| PbO-50 | 100 | 1 | 5 | 50 | - |
| PbO-70 | 100 | 1 | 5 | 70 | - |
| Pb(NO3)2-30 | 100 | 1 | 5 | - | 30 |
| Pb(NO3)2-50 | 100 | 1 | 5 | - | 50 |
| Pb(NO3)2-70 | 100 | 1 | 5 | - | 70 |