Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.

REACH

Triboron trimethyl hexaoxide

EC number: 203-016-8 | CAS number: 102-24-9

Life Cycle description
Uses advised against

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Triboron trimethyl hexaoxide is known to rapidly hydrolyse in contact with water to form methanol (CAS 67-56-1) and boric acid (CAS 10043-35-3) (Steinberg and Hunter, 1957). For both hydrolysis products relevant aquatic toxicity data was gathered from the ECHA dissemination dossier (d.d. 2014 -04 -24) and tabulated below.

Aquatic toxicity data for methanol:

Study	Species	Endpoint	Effect value
Fish acute toxicity	L. macrochirus	96-h LC50	15400 mg/L
Fish chronic toxicity	No relevant/reliable information for C&L available available*	-	-
Aquatic invertebrates acute toxicity	D. magna	96-h EC50	18260 mg/L
Aquatic invertebrates chronic toxicity	No relevant/reliable information for C&L available available**	-	-
Algae	P. subcapitata	96-h ErC50	22000 mg/L

* One supporting and two WoE endpoints available. However notable limitations in reporting and/or effect value unsuitable for C&L.

** One supporting and two WoE endpoints available. However notable limitations in reporting and/or effect value unsuitable for C&L.

Aquatic toxicity data for boric acid:

Study	Species	Endpoint	Effect value
Fish acute toxicity	L. limanda (saltwater)	96-h LC50	74 mg/L*
Fish chronic toxicity	I. punctatus	9-d LC10	3.5 mg/L**
Aquatic invertebrates acute toxicity	H. azteca	96-h LC50	64 mg/L***
Aquatic invertebrates chronic toxicity	D. magna	21-d NOEC	6 mg/L****
Algae acute	S. capricornutum	72-h EC50	52.4 mg/L *****
Algae chronic	S. capricornutum	72-h NOEC	17.5 mg/L *****

* lowest effect concentration of two WoE endpoints.

** lowest effect value of a total of 11 WoE endpoints for both boric acid and various boron/borate species.

*** lowest effect concentration of a total of 23 WoE endpoints for both boric acid and various boron/borate species.

**** lowest effect concentration of a total of 10 WoE endpoints for both boric acid and various boron/borate species.

***** lowest effect concentrations from one of two WoE endpoints.

Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.