Physical State: Clear liquid Appearance: colorless to slight yellow Odor: penetrating odor - ammonia-like Vapor Pressure: 527 mbar @ 20 deg C Boiling Point: 36 deg C @ 760.00mm Hg Freezing/Melting Point: -140 deg C Autoignition Temperature: 206 deg C ( 402.80 deg F) Flash Point: -36 deg C ( -32.80 deg F) Explosion Limits, lower: 2.3 vol% Explosion Limits, upper: 12 vol% Decomposition Temperature: Solubility in water: Soluble. Specific Gravity/Density: .6750g/cm3