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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information


In the key study (BASF DocID: TZ-322-001, 1987) teflubenzuron was found to be stable to hydrolysis at pH 5 and 7 after 30 d at 25°C. At a temperature of 25 °C and a pH of 9 the hydrolsis DT50 of teflubenzuron is 8.7 days . The hydrolysis DT50 of teflubenzuron at pH 9 was calculated to be 24.6 days at 12 °C (Chapter R.7b, p.222: Endpoint specific guidance Version 4.0 – June 2017). The metabolites identified after 30 days at pH 9 were 3,5-dichloro-2,4-difluorophenylurea (61% AR from the aniline label), 3,5-dichloro-2,4-difluoroaniline (12% AR from the aniline label), 2,6-difluorobenzoic acid (62% AR from the benzoyl label), 2,6-difluorobenzamide (12% AR from the benzoyl label), and N-(2,4-difluoro-3,5-dichlorobenzene)-5-fluoro[3H]-dihydroquinazoline-2,4-dione (8% AR from the aniline label and 5% AR from the benzoyl label).


Phototransformation in air:

Following the Atkinson calculation, the photochemical half-life for reactions with OH-radicals (12-hr day; 1.5 x 106 OH/cm3) was determined to be 1.7 days (BASF DocID: TZ-630-013).


Phototransformation in water:

Teflubenzuron was stable to photolysis for up to 7 days (93% AR as teflubenzuron, BASF DocID: TZ-322-002, 1987) at pH 5 and 25 °C. The degradation was then accelerated with 45% AR as teflubenzuron after 15 days. A photolytic half-life was estimated at about 10 days.

Since teflubenzuron was stable for up to 7 days, it was proposed that no aqueous photolysis studies are required on metabolites.



Phototransformation in soil:

In the study of Hawkins (1987, DocID: TZ-620-007) Teflubenzuron was photodegraded with a half-life of about 104 days. The metabolite 3,5-dichloro-2,4-difluorophenylurea appeared after 15 days at a level of 2% AR.

Photodegradation will not be the main degradation route of teflubenzuron in soil.

Additional information