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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

A degradation category approach is applied, based on the very rapid and complete degradation (hydrolysis) of boron trichloride in water to form hydrochloric acid and boric acid. The description and justification of the category is presented in Section 13. The endpoint results of the degradation products are transcribed to boron trichloride.

The environmental fate depends in each case (also for humid air) on the presence of water or humidity. Therefore it is possible and necessary to describe the environmental fate of BCl3 by the fate of its degradation products.

The degradation of the inorganic compound boron trichloride is well understood. It degrades rapidly within 1 minute in water to hydrogen chloride and boric acid. Both inorganic degradation products can dissociate but are not further degradable. Biodegradation is not a relevant concept for inorganic substances.


There are no indications that boron trichloride and its degradation products could be bioaccumulative.

For adsorption to soil it can be assumed that the ions of HCl could undergo an ion exchange reaction with the soil. Boric acid is considered to adsorb only to a low degree to soil.