4-isopropyltoluene chemical properties mp -68 °c bp 176-178 °c(lit.) density 0.86 g/ml at 25 °c(lit.) vapor density 4.62 (vs air) vapor pressure 1.5 mm hg ( 20 °c) fema 2356 refractive index n20/d 1.490(lit.) fp 117 °f storage temp. flammables area water solubility practically insoluble