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EC number: 219-909-0
CAS number: 2568-90-3
Vapor pressure is related to temperature by the following equation:
Log10 [Vp (Pa)] =(slope/temperature (K))+intercept
A plot of Log10 Vp (Pa) versus reciprocal temperature (1/T(K)) therefore
gives a straight line graph.
The vapor pressure of the sample was measured over a range of
temperatures to enable extrapolation to 298.15 K.
The vapour pressure of butylal was determined using an isoteniscope
system in which the sample's vapor pressure was measured using a
mercury-in-glass manometer. The temperature of the sample was regulated
by use of a silicone oil bath.
The isoteniscope method was chosen as a literature search, and
information provided by the Sponsor, indicated the test item would have
a vapor pressure outside the scope of the vapor balance method. The
isoteniscope method requires the test item to be boiled under vacuum in
order to “trap” the vapor in the isoteniscope tube. Due to the boiling
point of the test item being approximately 179 °C, determinations below
50 °C were not possible as insufficient vapor would be present to allow
readings to be taken.
A total of three runs were performed, the Vapour pressure was calculated
as the mean of the three runs and was measured to be 111 Pa at 25 ºC.
The vapour pressure of Butylal has been measured according to OECD TG
104 and GLP, using the isoteniscope method. The vapour pressure was
determined as a mean of three runs as 111 Pa at 25°C.
This key study is supported by non-GLP studies:
The vapour pressure of Butylal (purity of 99.8%) has been determined as
0.079 kPa at 20°C following an internal method that is in accordance
with norm annex A.4 of the Directive 92/69/EEC. The method consist in
the determination of a temperature-pressure curve in a pressure range of
about 1 to 1000 hPa by the dynamic method. As 20 °C lies outside the
temperature range belonging to this pressure range, the vapour pressure
at 20 °C is calculated by extrapolation.
In published study (Palczewska, 2011), vapour pressure of
dibutoxymethane (purity of 99.98%) was measured following comparative
ebulliometric technique comprising a dynamic twin-ebulliometer assembly.
Temperature measured with a platinum resistance thermometer operated in
conjunction with a Mueller bridge and an electronic null detector. As 20
°C lies outside the temperature range belonging to this pressure range,
the vapour pressure at 20 °C is calculated by extrapolation. The
estimated vapour pressure of dibutoxymethane is 0.061 kPa at 20°C
Reid Vapour Pressure (RVP) of butylal was measured according ASTM D 323
modified at 20°C as <0.138kPa and as <0.25 kPa (Van Immerseel, 1995,
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