Registration Dossier
Registration Dossier
Data platform availability banner - registered substances factsheets
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Diss Factsheets
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 274-936-5 | CAS number: 70851-50-2
- 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
Hazard for air
Hazard for terrestrial organisms
Hazard for predators
Additional information
Conclusion on classification
Classification relevant information
Degradation:
- Biodegradation: inherently biodegradable (57% after 28 d and 65% after 60 d, OECD 301F) based on read across from CAS 18643-08-8
- Hydrolysis: half-life approx. 2.6 h at 20-25 °C and pH 7 (QSAR)
Bioaccumulation:
- Dimethoxymethyloctadecylsilane (CAS 70851-50-2): not relevant due to fast hydrolysis
- Silanol hydrolysis product: Octadecylmethylsilanediol
Log Kow = 7.9 at 20°C (QSAR)
BCF = 201.5 - 1165 L/kg (BCFBAF v3.01, QSAR)
Aquatic acute toxicity:
- Fish: no data available
- Aquatic invertebrates: EL50 (48 h) > 100 mg/L (nominal, OECD 202, Daphnia magna)
- Algae/aquatic plant: ErC50 (72 h) >31.8 mg/L (nominal, methanol as solvent) and > 29.5 mg/L (nominal, TBA as solvent), (OECD 201, Scenedesmus subspicatus) based on read across from CAS 16415-12-6
Aquatic chronic toxicity:
- Fish: no data available
- Aquatic invertebrates: NOEC (21 d) ≥ 10 mg/L (nominal, OECD 211, Daphnia magna) based on read across from CAS 16415-12-6
- Algae/aquatic plant: ErC10 (72 h) ≥ 31.8 mg/L (nominal, methanol as solvent) and 20.91 mg/L (nominal, TBA as solvent), (OECD 201, Scenedesmus subspicatus) based on read across from CAS 16415-12-6
Classification according to CLP
Dimethoxymethyloctadecylsilane (CAS 70851-50-2) hydrolyses to octadecylmethylsilanediol and methanol. The silanol hydrolysis product is not considered rapidly degradable. Acute toxicity data are available for two trophic levels (aquatic invertebrates and algae). No effects causing 50% mortality to aquatic invertebrates (EL50) or 50% inhibition to growth rate (ErC50) for aquatic algae were detected up to the limit of water solubility. Chronic aquatic toxicity data indicate no hazard within the range of water solubility. Therefore, dimethoxymethyloctadecylsilane (CAS 70851-50-2) is not classified and labeled according to the consolidated version of Regulation (EC) No 1272/2008 and further amendments (ATPs).
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.