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Diss Factsheets
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EC number: 439-510-7 | CAS number: 149048-48-6
- 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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Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Hazard for air
Hazard for terrestrial organisms
Hazard for predators
Additional information
Reaction Mass of N-[3-(trimethoxysilyl)propyl]-1,3-benzenedimethanamine and {3-[(2,2-dimethoxy-1,2-azasilolidin-1-yl)methyl]phenyl}methanamine is a multi-constituent substance, with two main constituents:
Constituent 1: [3-({[3-(trimethoxysilyl)propyl]amino}methyl)phenyl]methanamine at approximately 59.7%;
Constituent 2: {3-[(2,2-dimethoxy-1,2-azasilolidin-1-yl)methyl]phenyl}methanamine at approximately 20.3%;.
The substance is expected to be soluble in water, with a predicted water solubility value for Constituent 1 of 4.1E+04 mg/L at 20°C (QSAR) of the submission substance. The amine groups in Constituent 1 will protonate in solution, hence the predicted log Kow has been corrected for ionisation (See overall physicochemical discussion in Section 4.0). Constituent 2 is estimated to hydrolyse very rapidly, so neither water solubility nor log Kow can be measured.
Both constituents are expected to hydrolyse rapidly or very rapidly in contact with water (calculated half-lives: Constituent 1 = 4.8 hours; Constituent 2 = very rapid, at pH 7 and 20-25°C) to form [N-[3-(trihydroxysilyl)propyl]-1,3-benzenedimethanamine] and methanol. It is therefore likely that the test organisms in each test were exposed primarily to the hydrolysis products.
[N-[3-(trihydroxysilyl)propyl]-1,3-benzenedimethanamine] is very soluble in water, limited to approximately 1000 mg/L by condensation reactions. Also, the amine groups in the final silanol hydrolysis product will protonate in solution, hence the predicted log Kow has been corrected for ionisation (See overall physicochemical discussion in Section 4.0).
REACH guidance (ECHA 2016, R.16) states that “for substances where hydrolytic DT50 is less than 12 hours, environmental effects are likely to be attributed to the hydrolysis product rather than to the parent itself”. TGD and ECHA guidance (EC 2003, ECHA 2016) also suggest that when the hydrolysis half-life is less than 12 hours, the breakdown products, rather than the parent substance, should be evaluated for aquatic toxicity. Therefore, the environmental hazard assessment, including sediment and soil compartments due to water and moisture being present, is based on the properties of the silanol hydrolysis product, in accordance with REACH guidance. As described in Section 4.8, the silanol hydrolysis products may be susceptible to condensation reactions.
Consideration of the non-silanol hydrolysis products methanol:
Methanol: The properties of methanol have been discussed extensively in the public literature. Methanol is considered to be non-toxic to aquatic organisms at the concentrations at which it would have been present in the tests reviewed in this assessment; the short-term EC50 and LC50 values for methanol are in excess of 1000 mg/L (OECD (2004).
Reference:
OECD (2004). SIDS Initial Assessment Report for SIAM 19, Berlin, Germany, 18-20 October 2004, Methanol, CAS 67-56-1.
EC (2003). European Union Technical Guidance Document on Risk Assessment for New and Existing Substances, Part II, European Chemicals Bureau, 2003.
ECHA (2016). Guidance on information requirements and Chemical Safety Assessment. Chapter R.16: Environmental exposure assessment, version 3.0, February 2016.
Conclusion on classification
The substance has reliable short-term E(L)C50 values of 51 mg/L in invertebrates and 11 mg/L in algae based on tests with the whole substance. It has a reliable EC10 value of 3.9 mg/L and a NOEC value of 1 mg/L in algae.
The constituents of the substance hydrolyse rapidly or very rapidly in contact with water. No significant biodegradation was observed during the biodegradation in water screening test and no significant biodegradation of the silanol hydrolysis products is expected.
No toxicity to fish data are available, therefore it is not possible to assess which trophic level is the most sensitive in the short-term tests. The algal chronic NOEC/EC10 values do not necessarily cover the most sensitive species, and thus cannot be considered “adequate” chronic toxicity data.
In accordance with Regulation (EC) No 1272/2008 (as amended) (CLP), for non-rapidly degradable substances for which adequate chronic toxicity data are not available, a short-term E(L)C50 value of >10 to ≤100 mg/L leads to classification of Category Chronic 3.
Therefore, based on the algal ErC50 value of 11 mg/L, and the fact that the substance is non-rapidly degradable, these data are consistent with the following classification under Regulation (EC) No 1272/2008 (as amended) (CLP):
Acute toxicity: Not classified.
Chronic toxicity: Category Chronic 3.
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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