Registration Dossier
Registration Dossier
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EC number: 212-485-8 | CAS number: 822-06-0
Endpoint summary
Administrative data
Description of key information
Additional information
Abiotic degradation
Because of its reactivity with water (half-life t1/2: 0.23 hour (23 °C) to form amine or polyurea derivatives, monomeric HDI is not likely to be found in waste water streams or in other aquatic environments except near sources of release. Small amounts of hexamethylene diisocyanate (HDI) that have become encapsulated in water-insoluble polyurea agglomerates may persist in water.
Based on a
vapour pressure of 0.007 hPa HDI is expected to exist entirely in the
vapour phase in the ambient atmosphere. HDI degrades relatively rapidly
in the atmosphere by reaction with hydroxyl radicals (half-life, ≈2
days), and may also undergo hydrolysis. Therefore, it is not expected
that hexamethylene diisocyanate (HDI) will be transported long distances
in the atmosphere.
As hexamethylene diisocyanate (HDI) hydrolyses rapidly, also the
hydrolysis product hexamethylene diamine (HDA) (CAS-No. 124-09-4) was
estimated with AOPWIN v. 1.92. The atmospheric half life with approx. 6
hrs was maintained. Consequently, even the hydrolyis product would not
be transported long distances in the atmosphere.
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