Table 1. ENR Sulfur-Cured Compound Formulations in Parts per Hundred Rubber in Weight (phr).
| composition
(phr) |
|||||
|---|---|---|---|---|---|
| ingredient | S1 | S2 | S3 | S4 | S5 |
| ENR | 100 | 100 | 100 | 100 | 100 |
| zinc oxide (ZnO) | 5 | 5 | 5 | 5 | 5 |
| stearic acid (SA) | 1 | 1 | 1 | 1 | 1 |
| sulfur (S) | 0.3 | 0.5 | 0.8 | 1.0 | 1.6 |
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