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EC number: 214-189-4 | CAS number: 1112-39-6
- 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

Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- no hazard identified
Marine water
- Hazard assessment conclusion:
- no hazard identified
STP
- Hazard assessment conclusion:
- no hazard identified
Sediment (freshwater)
- Hazard assessment conclusion:
- no hazard identified
Sediment (marine water)
- Hazard assessment conclusion:
- no hazard identified
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no hazard identified
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
Conclusion on classification
Key parameters for classification:
The registered (parent) substance dimethoxy(dimethyl)silane (CAS No. 1112-39-6) hydrolyses rapidly in contact with water under environmentally relevant conditions. Therefore, the environmental hazard and risk assessment is based on the silanol hydrolysis product, dimethylsilanediol (CAS No. 1066-42-8, DMSD). The other hydrolysis product, methanol, is assumed to have a negligible impact on the environmental hazard profile of the parent substance based on the available body of evidence (OECD SIDS, 2004).
Abiotic degradation – Hydrolysis
DT50 < 0.6 h (25 °C and pH 7, OECD 111)
Biodegradation in water, sediment, and soil
Not readily biodegradable (higher tier biodegradation tests for soil, sediment and water).
Bioaccumulation
Log Kow (parent) = 2 (QSAR)
log Kow (silanol hydrolysis product) = -0.38 (at 20.2 °C, three-phase equilibrium method octanol/water/air)
Acute aquatic toxicity
Fish
LC50 (96 h) > 126 mg/L (measured arithmetic mean, Oncorhynchus mykiss, OECD 203, CAS No. 1066-42-8)
Aquatic invertebrates
EC50 (48 h) > 117 mg/L (measured arithmetic mean, Daphnia magna, OECD 202, CAS No. 1066-42-8)
Algae
ErC50 (72 h) > 118 mg/L (measured arithmetic mean, Pseudokirchneriella subcapitata, OECD 201, CAS No. 1066-42-8)
Chronic aquatic toxicity
Fish
EC10 (32 d) > 12 mg/L (meas. arithm. mean, Pimephales promelas, OECD 210, CAS No. 1066-42-8)
Aquatic invertebrates
NOEC (21 d) ≥ 12.6 mg/L (measured time-weighted average, Daphnia magna, OECD 211, CAS No. 1066-42-8)
Algae
NOErC (72 h) ≥ 118 mg/L (measured arithmetic mean, Pseudokirchneriella subcapitata, OECD 201, CAS No. 1066-42-8)
Classification according to CLP
Dimethoxy(dimethyl)silane hydrolyses rapidly under environmental conditions (DT50 < 0.6 h, at pH 7 and 25 °C) to form the hydrolysis product dimethylsilanediol (DMSD, CAS No. 1066-42-8) and methanol (CAS No. 67-56-1). The silanol hydrolysis product is not readily biodegradable. DMSD has a low potential for bioaccumulation based on its low log Kow (-0.38). Acute aquatic toxicity data for the silanol hydrolysis product dimethylsilanediol are available for all three trophic levels (fish, aquatic invertebrates, algae). No effects on aquatic organisms were recorded in the available studies with the silanol hydrolysis product, all LC/EC50 effect values are > 100 mg/L. Chronic aquatic toxicity studies are available for all three trophic levels (fish, aquatic invertebrates and algae). No effects were observed in the chronic studies up to the highest concentrations tested (12.6 mg/L (daphnia) and 118 mg/L (algae). On this basis, the parent substance dimethoxy(dimethyl)silane (CAS No. 1112-39-6) is not classified and labeled according to the consolidated version of Regulation (EC) No 1272/2008 including all further amendments (ATPs).
References
OECD SIDS, 2004: SIDS Initial Assessment Report for Methanol, SIAM 19, Berlin, Germany, 19-22 October 2004, Methanol, CAS 67-56-1
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