Gruneisen Parameter of Teflon from Hugoniots Measured at Different Initial States*

Abstract. The Gruneisen parameter for Teflon is calculated using measured Hugoniot states obtained by shocking Teflon initially at atmosphere pressure and an initial temperature of 200$^{\circ}$C. The Gruneisen equation of state is used with the reference state taken as the Teflon Hugoniot measured at atmospheric pressure and an initial temperature of 25$^{\circ}$C. An error analysis for Gruneisen parameter $\gamma $ yields large errors even for carefully done gas gun experiments using manganin gauges. Extremely accurate measurements of pressure, shock velocity, and particle velocity are required to reduce the error in g to approximately $\pm $ 10~{\%}.