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Environmental fate & pathways

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For 2,4,4(or 2,4,4)-trimethylhexa-1,6-diisocyanate studies on ready biodegradability are available.

The biodegradability of the test substance was examined in a "CO2 Evolution test" according to EU-Method C.5 (Hüls AG 1993) and Draft OECD-Guideline "301 B CO2 Evolution-Test" . CO2 was bound in aqueous NaOH solution and was measured at various timepoints over a period of 28 days. The test item was observed to be "not ready biodegradable" under the present test conditions (29% biodegradation within 28 days).

No further test data on degradation in sediment or soil are available. As the substance hydrolses rapidly, further tests on biodegradation do not seem to be necessary.

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