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EC number: 212-572-0 | CAS number: 827-52-1
- 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
Skin sensitisation
Administrative data
- Endpoint:
- skin sensitisation: in vivo (non-LLNA)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Well documented GLP study according to international guideline.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 001
- Report date:
- 2001
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 406 (Skin Sensitisation)
- Version / remarks:
- adopted 17 July 1992
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.6 (Skin Sensitisation)
- GLP compliance:
- yes (incl. QA statement)
- Type of study:
- guinea pig maximisation test
Test material
- Reference substance name:
- Cyclohexylbenzene
- EC Number:
- 212-572-0
- EC Name:
- Cyclohexylbenzene
- Cas Number:
- 827-52-1
- Molecular formula:
- C12H16
- IUPAC Name:
- cyclohexylbenzene
- Details on test material:
- - Name of test material (as cited in study report): MCS-2805
- Lot No.: ABDR-016
- Description: clear colourless liquid
- Composition: cyclohexylbenzene: 92.6%; bicyclohexyl: 6.9%
- Date received: 2001-08-06
- Storage conditions: room temperature, in the dark
Constituent 1
In vivo test system
Test animals
- Species:
- guinea pig
- Strain:
- Dunkin-Hartley
- Sex:
- male
- Details on test animals and environmental conditions:
- TEST ANIMALS
- Source: David Hall Limited, Burton-on-Trent, Staffordshire, UK
- Age at study initiation: approximately 8-12 weeks
- Weight at study initiation: 323-451g
- Housing: singly or in pairs in solid-floor polypropylene cages furnished with woodflakes
- Diet: ad libitum (Certified Guinea Pig Diet (Code 5026) supplied by PMI Nutrition International, Nottingham, UK)
- Water: ad libitum
- Acclimation period: ≥ 5 days
ENVIRONMENTAL CONDITIONS
- Temperature (°C): 17-23 °C
- Humidity (%): 30-70
- Air changes (per hr): ≥ 15
- Photoperiod (hrs dark / hrs light): 12/12
Study design: in vivo (non-LLNA)
Inductionopen allclose all
- Route:
- intradermal and epicutaneous
- Vehicle:
- arachis oil
- Concentration / amount:
- Concentrations as used in the main study:
- Intradermal injections: 5% v/v in arachis oil BP
- Topical induction: 100% (undiluted)
- Topical challenge: 75% v/v in arachis oil BP
Challengeopen allclose all
- Route:
- epicutaneous, semiocclusive
- Vehicle:
- arachis oil
- Concentration / amount:
- Concentrations as used in the main study:
- Intradermal injections: 5% v/v in arachis oil BP
- Topical induction: 100% (undiluted)
- Topical challenge: 75% v/v in arachis oil BP
- Details on study design:
- RANGE FINDING TESTS: The concentrations of test material to be used at each stage of the main study were determined by "sighting tests" in which groups of guinea pigs were treated with various concentrations of test material.
Sighting test -- Intradermal induction:
Intradermal injections (0.1 ml/injection site) were made on the clipped shoulder of two guinea pigs, using concentrations of 1% and 5% v/v in arachis oil BP. The degree of erythema at the injection sites was assessed approximately 24, 48, 72 hours and 7 days after injection. The degree of oedema was not evaluated. Any evidence of systemic toxicity was also recorded. The highest concentration that caused only mild to moderate skin irritation, an which was well tolerated systemically, was selected for the intradermal induction stage of the main study.
Sighting test -- Topical induction:
Two guinea pigs (intradermally injected with Freund’s Complete Adjuvant fifteen days earlier) were treated with undiluted test material and 3 preparations of the test material (75%, 50% and 25% v/v in arachis oil BP). Applications were made to the clipped flanks under occlusive dressings for an exposure period of 48 hours. The degree of erythema and oedema was evaluated approx. 1, 24 and 48 hours after dressing removal. The highest concentration producing only mild to moderate dermal irritation was selected for the topical induction stage of the main study.
Sighting test -- Topical challenge:
The undiluted test material and 3 preparations of the test material (75%, 50% and 25% v/v in arachis oil BP) were applied to clipped flanks of two guinea pigs under occlusive dressings for an exposure period of 24 hours. These guinea pigs did not form part of the main study but had been treated identically to the control animals of the main study up to day 14. The degree of erythema and oedema was evaluated approx. 1, 24 and 48 hours after dressing removal. The highest non-irritant concentration of the test material and one lower concentration were selected for the topical challenge of the main study.
MAIN STUDY
A. INDUCTION EXPOSURE
- No. of exposures: 2 (intradermal injection (day 0) and topical application (day 7))
- Exposure period: topical application: 48 h
- Control group: intradermal and topical induction procedure was identical to that used for the test animals except that the test material was omitted
- Site: shoulder region
- Concentrations: intradermal injection: (a) Freund's Complete Adjuvant plus distilled water in the ration 1:1 (b) a 5% v/v formulation of test material in arachis oil BP (c) 5% v/v formulation of test material in 1:1 preparation of Freud's Complete Adjuvant plus distilled water
B. CHALLENGE EXPOSURE
- No. of exposures: 1
- Day(s) of challenge: 21
- Exposure period: 24 h
- Site: right (undiluted) and left (75% v/v in arachis oil BP) flank
- Evaluation (hr after challenge): 24 and 48 - Positive control substance(s):
- no
- Remarks:
- No concurrent positive control but summary of historical positive control data was present (1998-2001)
Results and discussion
In vivo (non-LLNA)
Resultsopen allclose all
- Reading:
- 1st reading
- Hours after challenge:
- 24
- Group:
- test chemical
- Dose level:
- all dose levels
- No. with + reactions:
- 0
- Total no. in group:
- 20
- Remarks on result:
- other: Reading: 1st reading. . Hours after challenge: 24.0. Group: test group. Dose level: all dose levels. No with. + reactions: 0.0. Total no. in groups: 20.0.
- Reading:
- 2nd reading
- Hours after challenge:
- 48
- Group:
- test chemical
- Dose level:
- all dose levels
- No. with + reactions:
- 0
- Total no. in group:
- 20
- Remarks on result:
- other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: test group. Dose level: all dose levels. No with. + reactions: 0.0. Total no. in groups: 20.0.
- Reading:
- 1st reading
- Hours after challenge:
- 24
- Group:
- negative control
- Dose level:
- all dose levels
- No. with + reactions:
- 0
- Total no. in group:
- 10
- Remarks on result:
- other: Reading: 1st reading. . Hours after challenge: 24.0. Group: negative control. Dose level: all dose levels. No with. + reactions: 0.0. Total no. in groups: 10.0.
- Reading:
- 2nd reading
- Hours after challenge:
- 48
- Group:
- negative control
- Dose level:
- all dose levels
- No. with + reactions:
- 0
- Total no. in group:
- 10
- Remarks on result:
- other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: negative control. Dose level: all dose levels. No with. + reactions: 0.0. Total no. in groups: 10.0.
Applicant's summary and conclusion
- Interpretation of results:
- not sensitising
- Remarks:
- Migrated information Criteria used for interpretation of results: EU
- Conclusions:
- Under the conditions of the test, the test material produced a 0% (0/20) sensitisation rate and was classified as a non-sensitiser to guinea pig skin.
- Executive summary:
The study was performed to assess the contact sensitisation potential of the test material in the albino guinea pig.
20 test and 10 control animals were used for the study. 2 phases were involved in the main study: an induction of a response by intradermal injection and topical application and a topical challenge of that response.
Under the conditions of the test, the test material produced a 0% (0/20) sensitisation rate and was classified as a non-sensitiser to guinea pig skin.
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