Grade: ACS UN No.: UN1779 pH: (H2O) strongly acid Solubility: (20°C) soluble Melting Point: -9°C Boiling Point: 107°C Flash Point: 71°C Refractive Index: 71°C Explosion Limit: 10 - 45.5 %(V) Density: 1.2 g/cm3 (20°C) Ignition Point: 485°C