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EC number: 406-420-4
CAS number: 69430-40-6
The vapour pressure at 25°C was determined using the Static Technique.
During the measurements 1-7 at 26.78°C, a relatively large decrease in
vapour pressure could be observed. Therefore the sample was evacuated
for 10 s after each measurement. This decrease in vapour pressure is
probably caused by the presence of a volatile impurity. Because the
sample was re-exposed to a fresh vacuum at the start of each
measurement, the most volatile impurity was removed gradually. This
impurity was removed after approximately 7 measurements, indicating that
the amount of this impurity was relatively low. Therefore the 10 s
evacuation step between the measurements was stopped. Although the
vapour pressure was nearly stable at the end of the measurements, the
test substance behaviour was not ideal. The consequence of this is that
it is more difficult to determine "the vapour pressure" of the test
substance because the composition of the vapour in the sample cell
continuously changed. In order to obtain the vapour pressure at each
temperature, the results of the vapour pressure readings were
extrapolated (when necessary) to a theoretical initial measurement in
each series. The results are shown in Table 1 below.
1): After extrapolation to the measurements of series 3
2): The vapour pressure was nearly stable
In order to obtain the vapour pressure, the results at each temperature
were calculated relative to the vapour pressure measured at 38.90°C (see
Table l), taking into account the vapour pressure rise caused by the
rise in temperature.
The determination of the vapour pressure of DC 5067 was based on the
following guidelines: European Economic Community (EEC),EEC directive
841449 EEC, Annex, Part A, Methods for the determination of
physico-chemical properties, A.4: "Vapour pressuren, EEC Publication no.
L251, September 1984 Organization for Economic Co-operation and
Development (OECD), OECD guidelines for testing chemicals, Guideline
No.104: *Vapour pressure curvew, adopted May 12, 1981. The vapour
pressure curve was constructed using the determination of the vapour
pressure of DC 5067 at 26.78, 32.71 and 38.90°C, using the Static
Technique. The vapour pressure of DC 5067 at 25°C was extrapolated to be
32 Pa with an estimated error of +- 3 Pa, i.e. 0.24 +- 0.02 mm Hg.
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