Registration Dossier
Registration Dossier
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EC number: 701-276-1 | CAS number: -
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
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.
Key value for chemical safety assessment
- Half-life in air:
- 1 d
Additional information
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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