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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriate low concentrations.

Key value for chemical safety assessment

Additional information

The toxicity of 'Hexamethylene diisocyanate, oligomerisation product (biuret type)' on microorganisms was tested according to EU Method C.11 (Biodegradation: Activated Sludge Respiration Inhibition Test) with domestic activated sludge (Bayer AG, 2006). After 3 hours of incubation EC20 was 134.5 mg/L based on nominal concentration (EC50 = 645.7 mg/L).