Registration Dossier
Registration Dossier
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: 297-566-6 | CAS number: 93642-68-3
- 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

Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
log Kow [3-[3-(triethoxysilyl)propyl]oxolane-2,5-dione]: not relevant
log Kow [2-[3-(triethoxysilyl)propyl]butanedioic acid]: -0.8 at pH 7 and 20°C (QSAR)
log Kow [2-[3-(trihydroxysilyl)propyl]butanedioic acid]: -4.0 at pH 7 and 20°C (QSAR)
Log Kow [ethanol]: -0.3
Key value for chemical safety assessment
Additional information
The requirement to conduct an n-octanol/water partition coefficient for the substance is waived because in contact with water the substance hydrolyses very rapidly to form an intermediate ethoxysilane hydrolysis product, 2-[3-(triethoxysilyl)propyl]butanedioic acid. The ultimate hydrolysis products are 2-[3-(trihydroxysilyl)propyl]butanedioic acid and ethanol.
Predicted log Kow values of 2.0 at 20°C and -2.6 at 20°C were determined for the intermediate ethoxysilane hydrolysis product, 2-[3-(triethoxysilyl)propyl]butanedioic acid and ultimate silanol hydrolysis product, 2-[3-(trihydroxysilyl)propyl]butanedioic acid respectively, using a validated QSAR estimation method. This prediction refers to the unionised form of the substance. The butanedioic acid group in 2-[3-(triethoxysilyl)propyl]butanedioic acid will protonate in aqueous solution, therefore the estimated log Kow for the unionised form was corrected for ionisation using the equation provided in the ECHA Guidance R.7a (2008) and reported pKa value of 4.21 at 25°C (first ionisation) for butanedioic acid. At pH 2, pH 4, pH 7 and pH 9, the corrected log Kow values are 2.0, 1.8, -0.8 and -2.8 respectively. The relevant corrected log Kow values are used for risk assessment purposes.
Similarly, the ionised form of the ultimate hydrolysis product, 2-[3-(trihydroxysilyl)propyl]butanedioic acid has predicted log Kow values of -2.6, -2.8, -4.0 and -4.0 at pH 2, pH 4, pH 7 and pH 9 respectively.
Ethanol has a reported log Kow of -0.3 (Hansch 1995).
Hansch C 1995; Hansch C, Leo A and Hoekman D1995. Exploring QSAR. Hydrophobic, Electronic, and Steric Constants. ACS Professional Reference Book., American Chemical Society).
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.
