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The composition and appearance of CPUs.
| Cross-linked polyurethane |
Macrodiols | Diisocyanate | Chain extender | State at room temperature | Tg (°C) | T m (°C) |
|---|---|---|---|---|---|---|
| CPU 1 | PCEG 1 | HDI | TMP | Hard | −45 | 46 |
| CPU 2 | PCEG 2 | HDI | TMP | Frangibility | −48 | 44 |
| CPU 3 | PCEG 3 | HDI | TMP | Elasticity | −51 | 38 |
