| FS-1 | FS-2 | FS-3 | FS-4 | |
|---|---|---|---|---|
| Hardness (Shore A) | 73 | 73 | 72 | 71 |
| Sp. Gr. (-) | 1.51 | 1.50 | 1.51 | 1.51 |
| Tensile strength (kgf/cm2) | 91.1 | 85.9 | 77.3 | 76.3 |
| Elongation (%) | 203 | 207 | 213 | 220 |
| Modulus at 100% (kgf/cm2) | 49.6 | 44.2 | 42.5 | 36.0 |
| Tear strength (kgf/cm) | 29.0 | 29.1 | 31.8 | 29.9 |
| Compression set (%) | 4.6 | 6.2 | 7.2 | 8.8 |
| Change of hardness after thermal aging (pts) | 0 | +1 | +2 | +3 |
| Change of tensile strength after thermal aging (%) | -8.0 | -8.9 | -10.2 | -18.9 |
| Change of elongation after thermal aging (%) | -14.7 | -19.7 | -22.9 | -26.0 |