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Diss Factsheets
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EC number: 239-311-3 | CAS number: 15267-95-5
- 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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Endpoint summary
Administrative data
Description of key information
Additional information
- Concentration of the silanol; the greater the initial concentration, the greater the degree of condensation. Significant condensation is not expected at concentrations less than approximately 100 mg/l, but is dependent on specific conditions.
- pH; the condensation reaction may be either acid or base catalysed.
- Temperature.
- Other species present.
- The nature of the R group
- The number of Si-OH groups; silanetriols condense more rapidly than silanediols.
Physico-chemical properties
(Chloromethyl)triethoxysilane is a liquid at standard temperature and pressure. It is predicted to have a melting point of <-20°C, a predicted boiling point of 200°C and a predicted density of 1.04 g/cm3at 25°C. The static viscosity of the substance is predicted to be 1.2 mm2/s at 20°C and the vapour pressure of the substance is predicted to be 6.5 Pa at 25°C. The substance is classified as a flammable liquid on the basis of the boiling point and a measured flash point of 49°C. It is not pyrophoric or flammable in contact with water. It has a measured self-ignition temperature of 225°C, and is not explosive and not oxidising on the basis of chemical structure. It is not surface active.
In contact with water (chloromethyl)triethoxysilane reacts rapidly (half-life 2.5 hours at pH 7 and 20 - 25°C) to produce chloromethylsilanetriol and ethanol according to the following equation:
(CH3CH2O)3SiCH2Cl + 3H2O → ClCH2Si(OH)3 + 3CH3CH2OH
Therefore, requirements for testing of the water-based physicochemical properties for the substance and measurement of the surface tension are waived on the basis of instability in water. The properties of the hydrolysis products are assessed in instead.
The silanol hydrolysis product, chloromethylsilanetriol, is predicted to be very soluble in water 20oC (1E+06 mg/l) and has a log Kowof -2.1 (predicted). It is less volatile than the parent substance with a vapour pressure of 2.1E-03 at 25°C (predicted). The first dissociation constant (hydroxyl groups) of a structurally analogous silanetriol (phenylsilanetriol) has been reported to be around pKa10.
Methanol is miscible with water, has low log Kowof -0.3 and high vapour pressure of 7910 Pa at 20°C) (OECD, 2004).
Silanetriols may undergo condensation reactions to give siloxane dimers, oligomers and polymers, according to the scheme:
RSi(OH)3 ⇄ RSi(OH)2OSi(OH)2R ⇄ RSi(OH)2O[Si(R)(OH)O]nSi(OH)2R
(where R is an alkyl or aryl side-chain)
A highly cross-linked gel may form. The degree of condensation that will occur may vary with:
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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