Butyl isocyanate Chemical Properties Melting point 85.5℃ Boiling point 115 °C(lit.) density 0.88 g/mL at 25 °C(lit.) vapor density 3 (vs air) vapor pressure 10.6 mm Hg ( 20 °C) refractive index n20/D 1.406(lit.) Fp 64 °F storage temp. 2-8°C form Liquid color Colorless