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Diss Factsheets
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EC number: 933-047-9 | CAS number: 53880-05-0
- 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
Bioaccumulation: aquatic / sediment
Administrative data
Link to relevant study record(s)
Description of key information
A waiver is presented based on rapid hydrolysis and limited potential to be taken up by biota. As a summary, it is demonstrated
1. that performance of a BCF study is technically not possible due to rapid hydrolysis where parent components removed quickly
2. that hydrolysis products have indeed not been found in studies but that theoretical small ureas exceed by far the standard values for logKow and molecular diameter.
3. estimated values of a primary hydrolysis product show a low tendency for bioaccumulation (BCF 3.2)
Key value for chemical safety assessment
Additional information
The waiving is based on three arguments indicating that performance of a BCF study is scientifically not necessary and technically not possible::
1. As a consequence of the results of hydrolysis experiments (Allmendinger and Tretzel 2018), performance of a bioconcentration study with 3-Isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, oligomers appears technically not feasible. In a flow-through test the test compound is kept in a reservoir which is typically renewed daily. Based on a half-life of about 2 hours the requirement of the test guideline OECD 305 for stable conditions throughout the whole study cannot be satisfied.
2. The substance has very limited potential to be taken up by biota. According to ECHA guidance document R11, this is "indicated by several factors based on substance properties listed below. These indicators should be confirmed by other information to exclude the possibility of a high bioaccumulation potential. If such a lack of significant uptake is proven, the substance can be considered as not B and not vB. In such a case, further evaluation of the B and vB criteria is not necessary. It should be noted that the only conclusion drawn based on this information is that the substance is not (very) bioaccumulative, and not that the substance can’t be taken up at all. A substance is unlikely to meet the B criterion (i.e. unlikely to have a BCF >2,000) if some or all of the following indicators are met:"
a) The smallest theoretic possible primary hydrolysis product an average maximum diameter (Dmax aver) of greater than 17 A. The smallest theoretic possible hydrolysis product has maximum diameter of about 22 A (QSAR). Although a different model as OASIS was used (Marvin Scetch), the obtained value is far away from the given standard value.
b) octanol-water partition coefficient as Log Kow >10: The calculated value of the simplest molecule with an IPDI allophanate structure with a reliable model (Episuite) is 10.4. The urea as a theoretical primary hydrolysis product had a logKow of 15.4.
3. For the primary hydrolysis product of IPDI allophanate, NCO terminated a BCF of 3.2 was predicted using the Estimation Program Interface (EPI) Suite version 4.11.
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.
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