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EC number: 280-084-5 | CAS number: 82985-35-1
- 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
Adsorption / desorption
Administrative data
Link to relevant study record(s)
- Endpoint:
- adsorption / desorption: screening
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
Reference
Description of key information
Key value for chemical safety assessment
- Koc at 20 °C:
- 2.78
Additional information
Bis(trimethoxysilylpropyl)amine (CAS 82985-35-1) decomposes fast in the environment, due to rapid hydrolysis in contact with water forming the corresponding hydrolysis products bis(trihydroxysilylpropyl)amine and methanol (half-life < 1 h at neutral pH and room temperature). The silanol hydrolysis product has a very low octanol–water partition coefficient (log Kow = -4 based on QSAR) and thus low potential for adsorption. The other hydrolysis product, methanol has also negligible adsorptive properties (OECD, 2004). Thus in accordance with Column 2 of REACH Annex VIII, the adsorption/desorption screening test does not need to be conducted.
For the purposes of the chemical safety assessment further information on the adsorption behavior of the silanol hydrolysis product bis(trihydroxysilylpropyl)amine (since the parent compound is not stable in the environment), was collected using an appropriate calculation method.
Considering the ionizing properties of the compound, the adsorption potential has been calculated using Franco and Trapp ‘s expressions (2008) on estimation of the organic carbon-water partitioning coefficient of ionisable organic substances. The log Kow, the pH as well as the pKa values were used as input parameters. The pka values were determined using the software SPARC v4.6 (pKa calculator). Three macro pKa values were calculated i.e 10.77, 11.98, 12.8. The pKa value closest to environmental relevant conditions (10.77) was used for the calculation of the Koc coefficient.
The following equation was used for Koc calculation as suggested by the authors:
Koc =Fn x 100.37xlogPn+1.70+Fion x 10pKa^0.65xf^0.14
Where:
Fn = 1/(1+10(pH-pKa))
Pn: Kow of the neutral molecule (EpiWin)
pKa: 10.77 (calculated with SPARC)
Fion = 1- Fn
f: Ratio of concentration in octanol to total concentration: Kow (overall)/(Kow (overall) + 1)
The log Koc of the hydrolysis product was calculated to be 0.42 at pH 4; 0.44 at pH 7 and 0.73 at pH 9. These values indicate the low adsorption potential of the substance to organic carbons in soil. According to the Guidance on Information Requirements and Chemical Safety Assessment, Chapter R.7.1.8.5 the log D value for the ionized molecule determined around the default pH of 7 is considered more relevant for chemical safety assessment. On this basis the calculated log Koc of 0.44 (Koc = 2.78 at pH 7) has been used for the chemical safety assessment.
Reference:
Franco A. & Trapp S., 2008: Estimation of the soil-water partition coefficient normalized to organic carbon for ionizable organic chemicals. Environmental Toxicology and Chemistry, Vol. 27, No. 10, pp. 1995–2004.
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