Table 1. Formulation of the Compounds
| Unit: phr | NR / CB | NR / BR / CB | ENR-25 / BR / Silica |
| Ref. | NB20 | NB30 | EB20 | EB30 |
| NR | 100 | 80 | 70 | 0 | 0 |
| ENR-25 | 0 | 0 | 0 | 80 | 70 |
| BR | 0 | 20 | 30 | 20 | 30 |
| Carbon black (N220) | 55 | 0 | 0 | 0 | 0 |
| Carbon black (N234) | 0 | 55 | 55 | 0 | 0 |
| Silica | 0 | 0 | 0 | 55 | 55 |
| TESPT1) | 0 | 0 | 0 | 4.4 | 4.4 |
| DPG | 0 | 0 | 0 | 1.056 | 1.056 |
| TDAE oil | 5 | 5 | 5 | 5 | 5 |
| ZnO | 4 | 4 | 4 | 4 | 4 |
| Stearic acid | 3 | 3 | 3 | 3 | 3 |
| 6PPD | 2 | 2 | 2 | 2 | 2 |
| TMQ | 1 | 1 | 1 | 1 | 1 |
| Sulfur | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 |
| TBBS | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 |
| PVI | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
The amount of silane coupling agents was calculated as 8 wt% of the weight of silica.