Solubility parameters of rubbers and fillers84.
| Polymer material | Hildebrand solubility parameter (MPa1/2) |
|---|---|
| NBR | 19.3–20.3 |
| SBR | 16.6–18.3 |
| NR, BR, IIR | 16.2–16.6 |
| PE, EPM, EPDM | 16.2 |
| Silica | 28.4–36.5 |
| Carbon black | 24.4–30.5 |
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