| Material | Wt.% |
| NBR | 100 (Decreases gradually as the PVC percentage increases by 10 g per blend) |
| PVC | 0 - 70 |
| Carbon black 660 | 40 |
| MBTS | 0.7 |
| Sulfur | 1.5 |
| Zinc oxide | 3 |
| Stearic acid | 1 |