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Physical Properties of SIBS
| Shore hardness | 30A–60D |
| Mole percent styrene | 5–50 |
| Ultimate tensile strength (psi) | 2000–5000 |
| Ultimate tensile strength (MPa) | 10–20 |
| Ultimate elongation (%) | 300–1100 |
| Index of refraction | 1.525–1.535 |
| Water absorption (g/m2 at 24 h) | 0.2–0.3 |
| Weight average molecular weight | 60,000–150,000 |
| Polydispersity (M w/M n) | 1.2–2.1 |
