molecular weight: 89.09 density at 25 C: 0.98290 g/mL melting point: -91.32 C boiling point: 120 C vapor pressure at 20 C: 12.9 mm Hg vapor density (air = 1): 3.06 flash point: 103 F refractive index: 1.39439 critical temperature: 344 C ignition temperature: 802 F lower flammability limit (% by vol. in air): 2.6 solubility at 25 C,(% by wt compound in water): 1.7 wt water in compound: 0.5 molecular structure: other names: dimethylnitromethane;