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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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
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EC number: 204-468-9 | CAS number: 121-43-7
- 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
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Toxicological Summary
- Administrative data
- Workers - Hazard via inhalation route
- Workers - Hazard via dermal route
- Workers - Hazard for the eyes
- Additional information - workers
- General Population - Hazard via inhalation route
- General Population - Hazard via dermal route
- General Population - Hazard via oral route
- General Population - Hazard for the eyes
- Additional information - General Population
Administrative data
Workers - Hazard via inhalation route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 8.3 mg/m³
- Most sensitive endpoint:
- developmental toxicity / teratogenicity
DNEL related information
- Overall assessment factor (AF):
- 12.5
- Modified dose descriptor starting point:
- NOAEC
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- no hazard identified
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
Workers - Hazard via dermal route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 392 mg/kg bw/day
- Most sensitive endpoint:
- developmental toxicity / teratogenicity
DNEL related information
- Overall assessment factor (AF):
- 30
- Modified dose descriptor starting point:
- BMDL05
Acute/short term exposure
- Hazard assessment conclusion:
- no DNEL required: short term exposure controlled by conditions for long-term
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- no hazard identified
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
Workers - Hazard for the eyes
Local effects
- Hazard assessment conclusion:
- medium hazard (no threshold derived)
Additional information - workers
ECHA Guidance on information requirements and chemical safety assessment Chapter R.8: Characterisation of dose [concentration]-response for human health, Appendix R.8 -13 (Deriving DNELs, when a community/national occupational exposure limit (OEL) is available) provides for use of EU member state Indicative OELs (IOEL) as an approach to the derivation of DNELs for a substance.
Chapter R.8 guidance provides for use of the IOEL directly unless significant new data are available. In the case of Boron substances, no significant new data bearing on the estimation of an OEL have become available since 2006.
In March 2007, the FRG Committee for Dangerous Materials- AGS Management- BAuA developed IOEL(s) for Boron substances. This evaluation formally considered all data available and relevant to the establishment of safe worker exposure limits and is fully of the scope anticipated by REACH guidance in calculating worker DNELs.
For the derivation of the worker long-term inhalation DNEL, two aspects were considered based on the German expert committee’s derivation of the worker exposure limits (AGW) for boric acid and sodium tetraborate:
• Local effects: With inhalation exposure to boric acid, boron oxide and sodium tetraborate, irritation to the respiratory tract and to the eyes was described in occupational reports.
• Systemic effects: After oral administration of boric acid or sodium tetraborate to animals, reproductive effects (effects to offspring, fertility effects) were observed. In humans, effects on fertility are suspected.
The derivation of the worker exposure limit for boric acid and sodium tetraborate on the basis of the local irritation effects in humans, described in occupational studies, results in a limit for boric acid and sodium tetraborate of 0.5 mg B/m ³ (rounded from 0.45 mg B/m3). In contrast to this, calculation of an extrapolated value expected to be protective against reproductive effects results in an exposure limit of 11 mg Bor/m ³ .
Irritative effects on the nose and the throat, coughing, breathlessness, and eye irritation were observed, in a dose-dependent manner, with exposures between approx. 1 mg/m3and15 mg/m3(Hu et al., 1992; Wegman et al., 1994). At the lowest group of exposures (1-4 mg/m3) these effects were minimal, so an acceptable NOAEL is approx. 1-2 mg/m3. As discussed by Culver et al. (1994), as well as after personal communication of Culver (2006), the Wegman et al. study was concluded to underestimate exposure by a factor of 1.76. From these data, they derived a NOAEL for irritation of 3 mg/m3(sodium borate). These values are supported by the study of Garabrant et al. (1985), however, due to instrumentation uncertainties and resulting uncertainties in the administration, this study is considered not relevant for the evaluation.
Since the derivation is based on a NOAEL from occupational studies, the extrapolation factors for allometric scaling and species variability, used during the derivation of the AGW on the basis of animal experiments, are not relevant. Regarding the extrapolation from acute to subchronic exposure, an extrapolation factor of 1 is used since no chronic changes were observed after multiyear exposure in occupational studies. On the basis of local irritation effects in humans, a concentration of 0.5 mg B/m3is proposed to be the AGW value for boric acid and sodium tetraborate.
General Population - Hazard via inhalation route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- no hazard identified
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- no hazard identified
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
General Population - Hazard via dermal route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- no hazard identified
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- no hazard identified
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
General Population - Hazard via oral route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- no hazard identified
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
General Population - Hazard for the eyes
Additional information - General Population
There is no opportunity for exposure to trimethyl borate. Therefore, setting DNELs for the general population is not appropriate.
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.
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