Pressure, volume, and energy equation of state data obtained using shock wave techniques are presented for aluminum and Teflon. Solid aluminum samples initially at room temperature or preheated to near melting, and porous aluminum samples at room temperature, were studied over a pressure range of 200 to 1200 kbar. It was found that the largest variations of volume and energy could be achieved using porous samples. Values of Gruneisen's ratio estimated from values of the thermal pressure and thermal energy range from 2.1 to 1.37. Due to the sensitivity of Gruneisen's ratio to the Hugoniot data, it is not possible to formulate its energy or volume dependence conclusively at the present time. Of greatest significance is the fact that it does not vary widely. Solid and porous Teflon samples were studied over a pressure range of 100 to 500 kbar. Hugoniot curves drawn on the basis of the ten data points obtained indicate a variation of Gruneisen's ratio from about 0.7 to 2.0.