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EC number: 218-664-7
CAS number: 2212-81-9
Data obtained are data extrapolated data from temperature range from
about 140 -155°C down to 50 -100°C.
Extrapolated data at 20°C
1.2 x 10-6mbars
Extrapolated data at 50°C
1.7 x 10-6mbars
Extrapolated data at 60°C
7 x 10-4mbars (liquid)
Extrapolated data at 80°C
Extrapolated data at 90°C
3 x 10-2mbars
Extrapolated data at 100°C
Temperature at which the vapour pressure is 4 mbars
Temperature at which the vapour pressure is 10 mbars
Temperature at which the vapour pressure is 15 mbars
Theoretical calculated boiling point
206°C – In reality decomposes
At 20 mbars decomposition of the substance was observed.
The corresponding equation for extrapolation is :
ln P = 39.181 -15467/T
A detailed study report on the measurement of vapour pressures according
to ASTM E-1782 -03 is available. By extrapolation, the vapour pressure
of the substance is found to be 1.2 x 10-6 mbars at 20°C.
Vapour pressure of [1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl]
peroxide is estimated to be similar to analogous [1,3(or
1,4)-Phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide, which
was found to be 0.00012 Pa at 20°C (by extrapolation)
experimental study compliant with accepted scientific principles shows
that the vapour pressure of
[1,3-phenylenebis(1-methylethylidene)]bis[tert-butyl] peroxide is 60 Pa
at 100°C. We have to be careful with extrapolation of the P, T-curve.
The results are only valid for liquid peroxides (up to the melting
temperature). In consequence, the vapour pressure of solid peroxide will
be lower than the extrapolated value of the liquid.
experimental study compliant with accepted scientific principles,
selected as Key Study, shows that the vapour pressure of analogous
1,4)-Phenylenebis(1-methylethylidene)]bis[tert-butyl]peroxide is 0.00012
Pa at 20°C (extrapolated value).
an estimation of the vapour pressure
been performed using the EPISUITE model v4 with the estimated boiling
point given by the model. Estimated vapour pressure (using Modified
Grain method) is 22 Pa at 100°C and 0.0091 Pa at 25°C with the following
input data :
boiling point : 350.78°C (estimated)
melting point : 54°C (experimental data of analogous 25155-25-3).
vapour pressure (using Modified Grain method) is 0.0023 Pa at 25 oC
using the default calculated mp of 113.26 oC.
specific applications the substance will be warmed between 55 and 60 °C.
The substance decomposes after melting at these temperatures. The main
vapour emission at this operating temperature will come from the
decomposition products like acetophenone. At a temperature of 90 °C the
vapour pressure was not detectable (detection limit 0.1 mbar). The
calculated vapour pressure at 60 °C is 0.00011 mbar (0.01 Pa), Report
AkzoNobel TE 200600519. The calculation is based on extrapolation of the
measured vapor pressure in DSC scans in the temperature range of 101 to
124°C. High heating rate is applied to minimize thermal
decomposition.The operational temperature will be < 60 °C and
thereforethe vapor pressure will be well below 0.01 Pa.
results (experimental and estimated values) show that and
[1,3-phenylenebis(1-methylethylidene)bis[tert-butyl] peroxide and
analogous 25155-25-3 have a very low potential of volatility.
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