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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

Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- Please refer to the justification for grouping of substances provided in IUCLID Section 13.
- Reason / purpose for cross-reference:
- read-across source
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- > 118 mg/L
- Nominal / measured:
- meas. (arithm. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Duration:
- 72 h
- Dose descriptor:
- NOEC
- Effect conc.:
- >= 118 mg/L
- Nominal / measured:
- meas. (arithm. mean)
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Conclusions:
- A 72-hour EC50 value of >118 mg/L and a NOEC of ≥118 mg/L have been determined for the effects of the source substance on growth rate of Pseudokirchnerella subcapitata (OECD 201, GLP). The source substance is the hydrolysis product of the target substance. Since the hydrolysis half life is < 1 h, the results derived for the source substance describe additionally the effects of the the target substance.
Reference
Description of key information
ErC50 (72 h) >118 mg/L (OECD 201, Pseudokirchneriella
subcapitata); read across from hydrolysis product (dimethylsilanediol)
NOErC (72 h) ≥ 118 mg/L (OECD 201, Pseudokirchneriella subcapitata);
read across from hydrolysis product (dimethylsilanediol)
Key value for chemical safety assessment
Additional information
Experimental data for dimethoxydimethylsilane (CAS 1112-39-6) are not available. However, since dimethoxydimethylsilane hydrolyses rapidly to dimethylsilanediol and methanol (DT50 < 0.6 h) the hydrolysis products rather than the parent substance should be considered for the assessment, read-across data for the hydrolysis product, dimethylsilanediol, are considered appropriate for the assessment.
The toxicity to aquatic algae was investigated according to OECD 201 (GLP). Pseudokirchneriella subcapitata was exposed to dimethylsilanediol at concentrations of 7.5, 15, 30, 60, and 120 mg/L (nominal) including a control (Dow Corning, 2009c). The actual exposure concentrations were measured by HPLC/RID analysis. Mean measured concentrations were 93 - 121% of nominal. Thus, the effect concentrations were based on the measured concentrations. The ErC50 (72 h) was estimated to be >118 mg/L, the highest concentration tested. The NOEC (72 h) for growth rate is ≥118 mg/L.
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