Registration Dossier
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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
EC number: 237-235-5 | CAS number: 13703-82-7
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Endpoint summary
Administrative data
Description of key information
Additional information
Abiotic degradation
Phototransformation and hydrolysis are the main abiotic degradation pathways for a substance. Magnesium metaborate is neither susceptible for phototransformation in air, water and soil nor for hydrolysis under environmental conditions.
Phototransformation is not applicable to Boron compounds.
No further information concerning photodegradation in air, water or soil is available. Based on the produced and supplied form of the test substance, no phototransformation in the environmental compartment is expected.
A hydolysis study according to OECD Guideline 111 (Fox, 2017) was not carried out, because the active ingredient in the test item was an inorganic. The test method is not applicable to inorganic substances. Additionally, the test item as a whole would be too insoluble for the test to be performed practically.
Biotic degradation
A 28 day study key study (Bayliss, 2016) was performed to assess the ready bioavailability of the test substance in an aerobic aquaeous medium. The method followed the OECD Guidelines for Testing of Chemicals (1992) No. 301B, "Ready Biodegradability; CO2 Evolution Test" referenced as Method C.4-C of Commission Regulation (EC) No. 440/2008 and US EPA Fate, Transport, and Transformation Test Guidelines OCSPP 835.3110 (Paragraph (m)) and was conducted in compliance with GLP criteria.
The test substance attained 4% biodegradation after 28 days. The results obtained from the mineral oil vessels showed 37% degradation over the test period. Correction of the biodegradation rate of the test substance for mineral oil degradation showed that the test substance achieved 0% biodegradation after 28 days. The test substance therefore cannot be considered to be readily biodegradable under the strict terms and conditions of OECD Guideline No. 301B.
Bioaccumulation
The Bioconcentration factor (BCF) of magnesium metaborate was predicted with BCFBAF v3.01 which is implemented in EPIWIN v4.11. The Bioconcentration factor according to Arnot-Gobas method (upper trophic) is log BCF = -0.05 (BCF = 0.893 L/kg bw). However, the prediction does not fall into the applicability domain of this model, since the substance is inorganic. Nonetheless the bioconcentration is predicted to be low.
Transport and distribution
Determination of the adsorption coefficient was not carried out using the HPLC screening method, designed to be compatible with Method C.19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for Testing of Chemicals, 22 January 2001, as the active ingredient in the test item was an inorganic. The test guidelines state they are not applicable to inorganic substances. A QSAR prediction has been made to allow PNEC derivation using partition-equilibrium method.
The Koc of magnesium metaborate was predicted with KOCWIN v2.00, which is implemented in EPIWIN v4.11. The predicted Koc is 240 L/kg bw [LogKoc: 2.38].
However, this prediction does not fall within the applicability domain of this model, since the query substance is inorganic.
Boric acid as well as other simple boron compoundswill predominantly exist as undissociated boric acid in aqueous solutions in acidic milieu withpH <7, whereas atabout pH 10 the metaborate anion (B(OH)4-) becomes the main species in solution (WHO, 1998).
It is therefore conclusive that in the plasma of mammals and in the environment the main species is undissociated boric acid.
Since other borates like magnesium mentaborate dissociate to form boric acid in aqueous solutions, they too can be considered to exist as undissociated boric acid under the same conditions.
The vapour pressure for boric acid is extremely low so volatilization is expected to be minimal. The same can be expected for magnesium metaborate with a tested vapor pressure of 0.0365 Pa at 25°C (Tremain, 2017a).
Henry's Law constant of magnesium metaborate was calculated based on the measured vapour pressure and water solubility. It is 40.11 Pa m3/mol.
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.