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Physical & Chemical properties

Vapour pressure

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Description of key information

The vapour pressure of the substance is 1536 Pa at 20±0.1°C and 1976 Pa at 25±0.1°C. This corresponds to 11.5 mgHg (torr) and 14.8 mmHG (torr), respectively.

Key value for chemical safety assessment

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

Additional information

The experimentally determined vapour pressure of the submission substance, i.e. "CAS 127 -52 -6 trihydrate" results in vapour pressure values of 1536 Pa (20°C) and 1976 Pa (25°C). These values are similar to the vapour pressure of pure water which is 2340 Pa at 20°C. It is assumed that the values reflect, that the substance contains 3 moles of water, corresponding to 21%. The vapour pressure of CAS 127 -52 -6, the main component of “CAS 127-52-6 trihydrate” is much lower by orders of magnitude, i.e. 2.44 x 10-9Pa (0.00000000244), corresponding to 1.83-11mmHg (0.0000000000183) as reported in literature. Since it cannot be excluded that CAS 127 -52 -6 co-evaporates with water due to its high water solubility of 100 g/L, the value of 2.44 x 10-9Pa (0.000000002) will be used for the risk assessment of the substance.