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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Phototransformation in air

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Administrative data

Link to relevant study record(s)

Description of key information

The calculated rate constant for the (indirect) photolysis of 2,4-TDI is 6.3x10(-12)cm(3)/molecule*sec

Key value for chemical safety assessment

Half-life in air:
2 d

Additional information

Experimental data were generated with an 80:20 mixture of 2,4- and 2,6-TDI. For that mixture, measured and calculated data were in reasonable agreement. For 2,4-TDI the calculated rate constant is 6.3 x 10-12 cm3/molecule*sec.