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Vapour pressure

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Description of key information

0.011 kPa at 25 °C

Key value for chemical safety assessment

Vapour pressure:
0.011 kPa
at the temperature of:
25 °C

Additional information

Available literature data were used for the evaluation of the vapour pressiure of the substance.

In one of the studies, an electrically heated modification of the Ramsay and Young type of apparatus was used to determine the vapor pressure. Duplicate runs of about twenty-five readings were made. Pressures were read on a closed manometer which had been corrected by reference to a standard barometer. The relation between boiling temperatures and vapor pressures of the substance was shown by calculating the appropriate constants for the Kirchhoff formula and the resulting equation was log P = 46.5630-12.426 log T-4972.5/T. Some decomposition of the substance was observed during the latter part of each run, as shown by the fact that a small amount of carbonaceous residue was formed at the place of evaporation. The vapour pressure of the substance at 25 °C is calculated as 0.011 kPa.

The vapour pressure of the substance was further determined using a Fischer–Labodest all-glass dynamic recirculating still, which was equipped with a Cottrell pump. The temperatures were measured by means of a model F25 thermometer with a PT100 probe from Automatic Systems Laboratories, and the pressures in the still were measured with a Digiquartz 735-215A-102 pressure transducer from Paroscientific. The vapour pressure of the substance at 110 °C is 4.690 kPa.

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