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EC number: 239-362-1 | CAS number: 15332-99-7
- 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
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Biodegradation in water (screening tests): 89% in 28 days (EU Method C.4-A), read-across from a related substance. The silanol hydrolysis product, vinylsilanetriol is not expected to biodegrade to any significant extent.
Key value for chemical safety assessment
Additional information
Acetone is readily biodegradable (OECD 1999).
No significant biodegradation is expected for the silanol hydrolysis product, vinylsilanetriol.
There are no reliable ready biodegradation data available for tris(isopropenyloxy)vinylsilane (CAS No: 15332-99-7), therefore good quality data for the analogous substance, tris(2-methoxyethoxy)(vinyl)silane (CAS No: 1067-53-4), have been read across. Both substances hydrolyse rapidly in contact with water and share the same silanol hydrolysis product, vinylsilanetriol. In view of the rapid hydrolysis, it is the silanol hydrolysis product, vinylsilanetriol that is relevant for environmental risk assessment.
The other hydrolysis products are propen-2-ol/acetone for the submission substance and methoxyethanol for the read-across substance.
Tris(isopropenyloxy)vinylsilane (CAS No: 15332-99-7) and tris(2-methoxyethoxy)(vinyl)silane (CAS No: 1067-53-4) are within an analogue group of substances within which, in general, there is no evidence of any significant biodegradation once hydrolysis and subsequent biodegradation of alkoxy/acetoxy groups has been taken into account.
This analogue group for the ready biodegradability endpoint consists of a number of sub-classes of substances (based on structure/functionality) with different main codes (used to represent the different sub-classes). However, read-across is carried out between substances with the same main code in most cases.
The table below presents ready biodegradation data for vinyl substances that are relevant for the submission substance. Tris(isopropenyloxy)vinylsilane (CAS No: 15332-99-7) and tris(2-methoxyethoxy)(vinyl)silane (CAS No: 1067-53-4) are members of this sub-class.
It is therefore considered valid to read-across the results for tris(2-methoxyethoxy)(vinyl)silane (CAS No: 1067-53-4) to fill the data gap for the submission substance. Additional information is given in a supporting report (PFA, 2013f) attached in Section 13 of the IUCLID 5 dossier.
Table: Ready biodegradation data for relevant substances within the relevant sub-class of chemicals
CAS |
Name |
Main code |
Readily biodegradable? Yes/no |
Result: Biodegradation after 28 day |
Guideline |
Reliability |
Corrected % biodegradation once alkoxy/acetoxy biodegradation is accounted for[1] |
1067-53-4 |
Tris(2-methoxyethoxy)vinylsilane |
II-2 |
Yes |
89% |
Annex V C4-A |
1 |
7 |
754-05-2 |
Trimethylvinylsilane |
I-1 |
No |
0% |
OECD 301C |
1 |
0 |
124-70-9 |
Dichloro(methyl)(vinyl)silane |
I-2-D-C |
No |
0% |
OECD 301A |
1 |
0 |
[1]The negative values in this column are where the biodegradation rate observed in the test is less than that expected assuming only alkoxy/acetoxy parts biodegrade. This could be due to low solubility of parent substance or low rates of hydrolysis. These values should in effect be considered as zero.
In the study with tris(2-methoxyethoxy)vinylsilane, 89% biodegradation was observed in 28 days.
Tris(2-methoxyethoxy)vinylsilane (CAS No: 1067-53-4) hydrolyses within the timescale of the ready biodegradation study to vinylsilanetriol and methoxyethanol.The biodegradation observed in the study is attributable to the biodegradation of the methoxyethanol hydrolysis product.
Methoxyethanol is expected to be readily biodegradable. No significant biodegradation is expected for the silanol hydrolysis product.
The study was conducted according to EU Method C.4-A and is considered reliable. This is selected as the key study. The key study is supported by biodegradation of 88% (9.93 mg/l initial test substance concentration) and 62% (20 mg/l initial test substance concentration) in 29 days. The study was conducted according to OECD 301B.
The studies are considered to be reliability 1 (reliable without restrictions); read across of the result is considered to be reliability 2 (reliable with restrictions).
References:
OECD (1999): SIDS Initial Assessment Report (SIAR) for the 9th SIAM, Paris, France, 29 -30 June 1999, Acetone, CAS 67-64-1.
PFA (2013f). Peter Fisk Associates, Biodegradation Main Analogue Group report, PFA.300.005.007
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.
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