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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 915-277-1 | CAS number: 32052-51-0
- 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
Endpoint summary
Administrative data
Link to relevant study record(s)
Description of key information
There were no studies available in which the toxicokinetic properties (absorption, distribution, metabolism, elimination) of 2,2,4(or 2,4,4)-trimethylhexane-1,6-diisocyanate were investigated.
Based on the molecular structure, molecular weight, water solubility, and results from octanol-water partition coefficient determination, it can be expected that oral, inhalative and dermal absorption rates are existent, distribution in the body is not wide. However, the results form acute and repeated dose studies shows that the substance has only low absorption rates. The test substance induces local effects by dermal irritation and corrosion as well as lung edema.
Key value for chemical safety assessment
- Bioaccumulation potential:
- no bioaccumulation potential
Additional information
The following remarks on the toxicokinetics of 2,2,4 (or 2,4,4)-trimethylhexane-1,6 -diisocyanate are based on physiochemical properties of the compound and on toxicological data. Experimental toxicokinetic studies were not performed.
The substance is a colourless to yellowish liquid having a molecular weight of 210.27 g/mol. It has a vapour pressure of 0.31 Pa at 20°C(AQura, 2011) and has a very low solubility in water in the hydrolysis studies (20 mg/l at 20 °C, IUCLID Chapter 5.1.2) under normal ambient conditions. The partition coefficient determination was not possible, because the substance reacts with water indicating a hydrophilic character of the substance. The substance is completely miscible with water.
Oral and GI absorption: Due to the fact that the substance is completely miscible in water, the substance will most probably be hydrolysed in the gastro-intestinal tract. However, the oral toxicity was low with a LD50(rat) of 4800 mg/kg bw (IBR, 1977).
Dermal absorption: Dermal absorption of the substance is anticipated to be moderate, due to the hydrophilic properties of the substance. The test substance showed clear dermal irritation and corrosion in an acute dermal irritation/corrosion study (Hüls AG, 1984), but no signs of systemic toxicity were observed. Furthermore, the test substance showed clear skin sensitizing properties in a guinea pig maximization test (Notox, 2000), thus indicating that significant dermal uptake is likely.
Inhalation absorption: Only the respiratory tract is concerned after acute and repeated inhalative aerosol exposure to rats (Kimmerle, 1972). All clinical signs and histopathological findings in these studies could be related to the irritant properties of the substance, indicating certain reactivity due to the chemical nature of the isocyanate-groups of the molecule. There are no indications supportive for an absorption or systemic availability of the substance or a metabolite.
Distribution:The physico-chemical information (molecular weight, low vapour pressure, hydropyhilicity and water solubility) indicates that the substance will be distributed.
Accumulative potential: Based on the physico-chemical information (e.g. water solubility), it is concluded that the potential for bioaccumulation is low as it is not proposed for classification as PBT substance.
No data are available regarding the excretion of absorbed substance.
Based on the results of several in vitro genotoxicity tests (LPT, 2011,2012; all performed with and without metabolic activation) it is concluded that DNA-reactive metabolites of the substance will not be generated in mammals in the course of hepatic biotransformation.
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.