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EC number: 206-596-0
CAS number: 355-93-1
It appears as though the chamber was not perfectly evacuated or that
there were dissolved non-condensable gases (e.g. N2) in the frozen
sample since the system was returned to cryogenic temperatures and the
pressure registered a value of 0.18 psia. This value was stable over 45
minutes and was treated as an offset that was subtracted from the other
readings in order to determine the “Corrected Vapor Pressure”.
vapour pressure of OFPMA was determined following a non-guideline
vapour-liquid equilibrium method similar to the static method. The
authors assumed the 0.18 psia recorded from the frozen sample once it
was returned to the cryogenic temperature was due to the chamber not
being perfectly evacuated or that there were dissolved non-condensable
gases in the frozen sample. The
measured values were corrected using this value; however, in theory the
pressure would increase with temperature. This
deviation is not anticipated to have a significant effect on the
reported measured value; therefore, the vapour pressure of OFPMA is
approximately 1241 Pa (0.18 PSI) at 25.5°C.
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