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EC number: 700-127-8 | CAS number: 21862-63-5
- 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
Description of key information
Skin sensitisation: not sensitising (EU method B.6; OECD 429; GLP compliant).
Key value for chemical safety assessment
Skin sensitisation
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (not sensitising)
- Additional information:
Skin sensitisation
The potential for skin sensitization was evaluated in a weight-of-evidence-approach. For this purpose three studies were used. One animal study (2008, EU method B.6; GLP compliant) is considered to be reliable without restrictions for this kind of substance. According to the results of this test, the substance does not have a sensitising potential. Furthermore, one animal study (2009, OECD 429; GLP compliant) is considered to be reliable with restrictions and again shows that the substance does not have a sensitising potential. However, a third reference (2009; OECD 429; GLP compliant) reliable with restrictions stated results, which indicated that the test substance is considered to be a skin sensitiser.
Given that the substance lacks any significant capacity to cause skin irritation (please refer to Section 7.3.1 Skin irritation / corrosion, skin reactions seen in sensitisation testing ought, most probably, to indicate the presence of allergenic hazard. However, two well conducted predictive assays which used high purity test samples (98% or greater), a GPMT (reference 2008)) and a LLNA (reference 2009)), were both convincingly negative. This conclusion was supported by a predictive human sensitisation test (please refer to Section 7.10.4 Sensitisation data (humans)). Furthermore, the chemical structure of the test substance, is not one likely to be associated with the reactive chemistry of skin sensitisation (Roberts et al. (2007))*.
Set against this, the other LLNA (reference 2009), conducted with a less pure sample and in a different vehicle, gave a weakly positive result. Added to this was the (unconfirmed) identification of a pre-sensitised individual in the HRIPT (please refer to Section 7.10.4 Sensitisation data (2009). It is possible that this individual was already sensitised to one of a number of related chemicals, e.g. p-tertbutylphenol, p-tert-butylcatechol etc., but it must be borne in mind that the chemistry of benzene and cyclohexane differs and that the understanding of cross reaction chemistry remains somewhat limited.
Search of the clinical literature does not yield any evidence of skin sensitisation to the test substance (e.g. Rietschel and Fowler (2008)**; Johansen et al. (2011)*** ), neither does a search of the internet via Google for “tertiary butyl cyclohexanol allergy”. Although the search is therefore consistent with a lack of skin sensitising activity associated with the test item, it must be recognised that this only represents an absence of evidence.
Based on the weight of available evidence, the test substance should not be classified as a skin sensitiser.
For more information please refer to the expert statement attached.
* (Roberts et al. (2007) Electrophilic chemistry related to skin sensitisation. Reaction mechanistic applicability domain classification for a published data set of 106 chemicals tested in the mouse local lymph node assay. Chemical . Research. Toxicology. 20, 44-60)
** Rietschel and Fowler (2008) Fisher’s Contact Dermatitis, 6th edition. BC Decker, Hamilton.
*** Johansen et al. (2011) Contact Dermatitis, 5th edition. Springer, Heidelberg
Justification for classification or non-classification
Classification, Labelling, and Packaging Regulation (EC) No 1272/2008
The available experimental test data are reliable and suitable for classification purposes under Regulation (EC) No 1272/2008.
Skin sensitisation
Based on a weight-of-evidence approach, the test item should not be classified as a skin sensitiser according to Regulation (EC) No 1272/2008 (CLP), as amended for the seventeenth time in Regulation (EU) No 2021/849.
Respiratory sensitisation
During long-year industrial practice no cases of hypersensitivity were observed till now by workers exposed exclusively to the test item. Thus, no classification as respiratory sensitiser according to regulation (EC) 1272/2008 is required up to now.
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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