Table 3. Cure Characteristics of NBR Compounds
| Filler | phr | Cure characteristics |
| ML (dNm) | MH (dNm) | △M (dNm)a | ts2 (m:ss) | t90 (m:ss) | CRI (min−1)b |
| Unfilled | | 3.62 | 27.15 | 23.53 | 2:49 | 5:53 | 32.61 |
| SRF | 20 | 3.75 | 32.84 | 29.09 | 1:58 | 5:58 | 25.00 |
| 40 | 6.02 | 41.24 | 35.22 | 1:49 | 5:41 | 25.86 |
| 60 | 8.75 | 50.81 | 42.06 | 1:42 | 5:15 | 28.17 |
| HS45 | 20 | 5.16 | 36.99 | 31.83 | 1:47 | 5:13 | 29.13 |
| 40 | 10.09 | 49.28 | 39.19 | 1:13 | 4:14 | 33.15 |
| 60 | 13.36 | 64.03 | 50.67 | 1:10 | 4:11 | 33.15 |
| 200MP | 20 | 8.3 | 44.18 | 35.88 | 2:49 | 4:52 | 48.78 |
| 40 | 20.65 | 70.88 | 50.23 | 1:20 | 3:29 | 46.51 |
| 60 | 68.63 | 122.74 | 54.11 | 1:38 | 6:55 | 18.93 |
| MWCNT | 5 | 5.68 | 34.62 | 28.94 | 2:19 | 5:15 | 34.09 |
| 10 | 10.53 | 44.84 | 34.31 | 2:08 | 6:11 | 24.69 |
| 15 | 20.8 | 61.31 | 40.51 | 1:49 | 4:53 | 32.61 |
| 20 | 27.87 | 69.55 | 41.68 | 1:44 | 5:09 | 29.27 |
| C-CaCO3 | 20 | 3.2 | 25.91 | 22.71 | 2:36 | 6:21 | 26.67 |
| 40 | 3.47 | 26.48 | 23.01 | 2:28 | 6:43 | 23.53 |
| 60 | 4.02 | 28.59 | 24.57 | 2:33 | 6:51 | 23.26 |
Increase in torque (MH-ML),
CRI (Cure rate index)=100/(t90-ts2).