Table 3. NR Sulfur-Cured Compound Formulations.
| composition
(phr) |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
| ingredient | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 | S9 |
| NR | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| ZnO | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| SA | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| S | 0.8 | 1.1 | 1.6 | 2.1 | 2.7 | 3.2 | 3.8 | 4.3 | 4.9 |
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