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Physical & Chemical properties

Partition coefficient

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Description of key information

According to column 2 of REACH Annex VII, performing of an experimental study is not useful in case of hydrolytical instability. In this case a half-life of about 15 seconds was reported in a hydrolysis test. Nevertheless it was possible to achieve an experimental value of 4.51 for monomeric MDI. This component is a main component present in the substance.

Key value for chemical safety assessment

Log Kow (Log Pow):
at the temperature of:
20 °C

Additional information

A calculated value of Pow = 7.74,  obtained using EPIWIN 4.00 with an idealised structure (one isocyanate group of 4,4-MDI is modified with 2-ethyl-hexanol). Both values, from monomeric MDI and for modified 2 -ethyl hexanol structure are due to the rapid hydrolysis only of theoretical interest.