Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Endpoint summary

Administrative data

Description of key information

Additional information

Due to its octanol-water partition coefficient (log P = 0.57) 1,3-diethyl-2-thiourea is not expected to adsorb to soil or sediment and will mainly be present in the aqueous phase.


DETU has been shown to be not toxic to fish and algae and harmful to daphnia in several acute studies:

  • fish: LC50-96h = 910 mg/L
  • algae: EC50-72h = 310 mg/L (based on specific growth rate)
  • daphnia: EC50-48h = 56 mg/L


Two chronic data are also available:

daphnia: EC10 -21d = 1.67 mg/L (based on reproduction)

algae: NOEC-72h = 73 mg/L (based on specific growth rate)