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Temperature-Vapour pressure equilibria were measured at increasing and decreasing temperatures.
Results are given in the Table.
Table, Vapour pressure of TFEE-5 as a function of temperature
Vapour pressure (hPa)
Results were plotted as 1/T (K) v. log VP (Fig. 2). Temperature-vapour pressure equilibria lie along the same line whether measured at increasing or decreasing temperatures, indicating that volatile components were not driven off during the increasing temperature phase of the test. The parameterized Antoine equation is:
log VP (hPa) = 8.12184 - (2161.94/[200 + T (°C)]), R-sq = 0.998
Extrapolated vapour pressures:
20 °C: 0.020 hPa
25 °C: 0.033 hPa
50 °C: 0.30 hPa
The vapour pressure of TFEE-5 was measured using a dynamic method according to EC No. 440/2008.A.4 and OECD TG104. The experimental apparatus was assembled from commercially-available components and calibrated regularly using n-Heptane and Hexadecane. Equilibrium data were analyzed using the Antoine relationship. The parameterized Antoine equation is log VP (hPa) = 8.12184 - (2161.94/[200 + T (°C)]) (R-sq = 0.998). The vapour pressure of TFEE-5 at 20 °C is 0.020 hPa.
The study was performed under GLP criteria and in accord with procedures detailed in internationally-accepted guidelines for the dynamic method. However, the dynamic method is not recommended for substances with VP less than 10 hPa. Therefore, the study is classified as reliable with restrictions.
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