| Melting point | -86 °C |
| Boiling point | 41.91°C (rough estimate) |
| density | 1.04±0.1 g/cm3(Predicted) |
| refractive index | 1.4300 (estimate) |
| PH | 3.35(1 mM solution);2.76(10 mM solution);2.23(100 mM solution) |
| EPA Substance Registry System | Isocyanic acid (75-13-8) |
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