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EC number: 202-476-7
CAS number: 96-09-3
oxide is a colourless, organic liquid at standard conditions (20°C, 1013
hPa). It has a melting point of -35.6°C and a boiling point of 194.1°C.
The substance has a density of 1.049 g/cm³ at 25°C.
vapour pressure of styrene oxide was determined via vapour pressure
balance (thermo-gravimetric effusion method; OECD guideline 104 and
EU-Method A.4) at temperatures of 30, 35, 40 and 45°C. Based on the
experimentally derived results the vapour pressure of 34.9 Pa at 20°C
was calculated by extrapolation. Styrene oxide has an n-octanol/water
partition coefficient log Kow of 1.61.
water solubility of styrene oxide was investigated in a study conducted
according to OECD Guideline 105 and EU-Method A.6 using the flask method
and GC-FID for quantification. It was observed that the test substance
concentrations decreased rapidly with the stirring times of 1, 3, 6 and
24 hours. It indicated that the test substance degrades/reacts when
dissolved in water. The test was performed with a minimum stirring time
of 1 hour. The concentration of this sample is issued as the water
solubility of the test substance. The water solubility of styrene oxide
was determined to be 1.49 g/L at 20°C, after 1 h of stirring. The pH of
the aqueous sample after 1 hour of stirring was 4.6.
flash point of styrene oxide was investigated in a study conducted
according to EU-Method A.9 using the the Pensky-Martens closed cup
method. The flash point of styrene oxide was determined to be 74°C at a
barometric pressure of 1013 hPa. Styrene oxide has an ignition
temperature of 498°C.
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