| Physical Properties |  | 
      
        | Molecular 
        weight | 72.11 | 
      
        | Boiling point | 66°C | 
      
        | Vapor pressure | 142 Torr 
        at 20°C | 
      
        | Freezing point | -108.5°C | 
      
        | Refractive 
        index | 1.4072 at 
        20°C | 
      
        | Density | 0.888 g/mL 
        (7.41 lb/gal) at 20°C | 
      
        |  | 0.881 g/mL 
        (7.35 lb/gal) at 25°C | 
      
        | Dielectric 
        constant | 7.58 at 
        25°C | 
      
        | Dipole moment | 1.75 D at 
        25°C | 
      
        | Solvent group | 3 | 
      
        | Polarity index 
        (P') | 4.0 | 
      
        | Eluotropic 
        value on alumina | 0.45 | 
      
        | Eluotropic 
        value on octadecylsilane | 3.7 | 
      
        | Viscosity | 0.55 cP at 
        20°C | 
      
        | Surface 
        tension | 26.4 dyn/cm 
        at 25°C | 
      
        | Solubility in 
        water | Miscible 
        in all proportions | 
      
        |  |  | 
      
        | Regulatory and Safety Data |  | 
      
        | DOT Hazard 
        Class | 3, 
        Flammable Liquid | 
      
        | Packing Group | II | 
      
        | UN 
        Identification Number | UN2056 | 
      
        |  |  | 
      
        | Storage | Store in 
        an area designed for flammable storage, or in an approved metal cabinet, 
        away from direct sunlight, heat and sources of ignition. | 
      
        |  |  | 
      
        | EPA applicable 
        waste code(s) | U213, D001 | 
      
        | Flash point | 6°F 
        (-14°C) by closed cup | 
      
        | Lower 
        explosive limit | 2% | 
      
        | Upper 
        explosive limit | 11.8% | 
      
        | Time Weighted 
        Average | 200 ppm 
        ACGIH | 
      
        | Peroxide 
        hazard | Check for 
        presence of peroxides before concentrating |