Diisopropyl azodicarboxylate is a light yellow transparent oil liquid with a special smell. Boiling point 75℃ Melting point 3-5 °C Boiling point 75 °C0.25 mm Hg(lit.) Density 1.027 g/mL at 25 °C(lit.) Vapor pressure 1.04 hPa (20 °C) Refractive index n20/D 1.420(lit.) Flash point 223 °F Storage conditions 2-8°C