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Henry's Law constant

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Description of key information

Henry's Law of ETU is 4.08e-2 Pa.m3.mol-1 at 20°C

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
at the temperature of:
20 °C

Additional information

The vapour pressure of imidazolidine was evaluated in a study performed in accordance with OECD testing guideline 104 and GLP requirements.

The method used is the Knudsen cell effusion method coupled to a microbalance. As the logarithm of the vapour pressure of a pure substance is a linear function of the inverse of the temperature, the vapour pressure is determinate in a limited temperature range (80 -100°C). Three vapour pressure are determinate : at 80°C , P = 2.719e-2Pa, at 70°C P=9.042e-3 Pa, at 60°C P=2.858e-3Pa and at 55°C P= 1.0449e-3 Pa.

The vapour pressure of ETU extrapolated at 20°C is 1.09e-5 Pa.

Solubility at 20°C was found 27.4 g/l at 20°C (OECD 105)

So as a consequence the Henry's law value equals 4.08e-2 Pa.m3.mol-1 at 20°C