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EC number: 701-029-8
CAS number: -
The half-life of 4,4'-MDI in the atmosphere has been estimated using the AOPWIN (TM) (v1.92) model and was 0.92 days (Pemberton and Tury, 2008).
There are no measured phototransformation data in air for the test
substance. The estimated dissipation half-life has been rounded off to 1
day. The exactly calculated value is 0.92 days.
This result was corroborated with a phototransformation analysis of a
structural analogue 4-tolylisocyanate (PTI). The phototransformation was
determined using the relative rate method where the rates of consumption
of PTI relative to a reference compound with a known OH radical rate
constant were measured in the presence of OH radical source. The
environmental chamber system employed was the Dividable Teflon Chamber.
This gave a phototransformation half-life of 0.89 days.
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