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Physical & Chemical properties

Vapour pressure

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Description of key information

The vapour pressure of the substance was determined using the isothermal thermogravimetric effusion method in a GLP study according to EC A.4, OECD 104 and OPPTS 830.7950. The constants specific for the experimental arrangement were determined using a set of five reference substances. Since the substance contained a high percentage of water,the measurements were performed at temperatures > 100°C to allow the water to evaporate before measuring weight loss as a function of time. Weight losses of the substance were measured at 160°C, 170°C, 180°C and 190°C. The experiment was performed in duplicate. From all results, the vapour pressure regression curve (log PT as a function of 1/T; with T in K) of the substance was constructed. The vapour pressure of the solid, water-free part of the substance was calculated (extrapolated) from the vapour pressure curve to be 1.5E-7 Pa and 3.7E-7 Pa at 20°C and 25°C, resp.  

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information

The vapour pressure of the solid, water-free part of the substance was determined to be 1.5E-7 Pa and 3.7E-7 Pa at 20°C and 25°C, resp.