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Diss Factsheets
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EC number: 701-408-8 | CAS number: -
- 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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Biodegradation in soil
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in soil: simulation testing
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
- Transformation products:
- yes
- No.:
- #1
- No.:
- #2
- No.:
- #3
- No.:
- #4
- No.:
- #5
- Details on transformation products:
- Degradation of the registration substance is expected to be principally via abiotic transformation under aqueous conditions (such as in a degradation simulation study). Therefore, the transformation products expected in the environment are those identified in the abiotic degradation study (reported in Section 5.1.2 of the IUCLID). Environmental hazard assessment is based on the properties of the hydrolysis products
Reference
Description of key information
Key value for chemical safety assessment
Additional information
Testing is waived on the basis that the chemical safety assessment according to Annex I indicates that it is not necessary to conduct the soil simulation test. The simulation test (soil) is not considered necessary because:
· The constituents of the submission substance are expected to hydrolyse rapidly to moderately and the corresponding silanol hydrolysis products have low log Kow values and, therefore, exposure of the soil compartment is expected to be low.
· The risk characterisation ratios (RCRs) for the soil compartment, based on the assumption that the constituents of the substance and their corresponding silanol hydrolysis products are not biodegradable, are <1.
· The non-silanol hydrolysis product, methanol is readily biodegradable.
Soil simulation studies, which are considered reliable, are available for dimethylsilanediol and methylsilanetriol (Silanol HP-X) (Lehmann et al. (1994), Lehmann et al. (1998), Sabourin et al. (1996a and b)).
These studies were conducted according to generally accepted scientific principles, and are used as weight of evidence that degradation in soil does occur but not to a significant extent. Initial rates of soil degradation from these studies are considered to be the data of most use, and most representative of field conditions, as rates tended to slow over the course of the experiments. Initial rates of degradation ranged from 0.16 to 2.1% per month. The decrease in rates of degradation over the course of the experiments may be due to some form of binding of organosilane compounds to soil, as indicated by HPLC analysis of HCl-extractable fractions from the soil in some of the studies.
It is considered relevant to read-across the soil degradation study for dimethylsilanediol to methylsilanetriol because both silanol hydrolysis products are structural analogues. Dimethylsilanediol contained two hydroxy groups and two methyl (alkyl) groups attached to silicon while methylsilanetriol has three hydroxy groups and one methyl (alkyl) group attached to silicon. Both dimethylsilanetriol and methylsilanetriol contained the same functional group, Si-OH. Both are expected to have similar physicochemical properties such as high water solubility, low log Kow and low vapour pressure.
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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