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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Link to relevant study record(s)

Description of key information

In a 3-h acute toxicity test, activated domestic sewage sludge were exposed to HDI Uretdion  at nominal concentrations of 1000, 1800, 3200, 5600, 10000 mg/L. 3, 5-dichlorophenol was used as reference material at 20 and 1000 mg/L (nominal concentration). The study was performed according to the OECD Guideline No 209. The 3h-EC50 value was determined to be 5560 mg/L (based on nominal concentrations) (BIS, 2006).
This study is classified as acceptable and satisfies the guideline requirements for toxicity to microorganisms study with Activated Sludge.

Key value for chemical safety assessment

EC50 for microorganisms:
5 560 mg/L

Additional information