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EC number: 226-603-0 | CAS number: 5435-64-3
- 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
- Study period:
- August 1996 until April 1997
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 997
- Report date:
- 1997
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 406 (Skin Sensitisation)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of study:
- guinea pig maximisation test
- Justification for non-LLNA method:
- common method of the time the study is performed
Test material
- Reference substance name:
- 3,5,5-trimethylhexanal
- EC Number:
- 226-603-0
- EC Name:
- 3,5,5-trimethylhexanal
- Cas Number:
- 5435-64-3
- Molecular formula:
- C9H18O
- IUPAC Name:
- 3,5,5-trimethylhexanal
- Details on test material:
- klare Flüssigkeit
Flüssigkeit erscheint optisch homogen
ph-Wert nicht messbar
Haltbarkeit > 1 Jahr
Reinheit 91,2 Masse-% (Gas-Chromatographie)
Constituent 1
In vivo test system
Test animals
- Species:
- guinea pig
- Strain:
- Dunkin-Hartley
- Sex:
- female
- Details on test animals and environmental conditions:
- TEST ANIMALS
- Source: Harlan Winkelmann GmbH, Versuchstierzucht, Borchen, Germany
- Microbiological status of animals, when known: healthy
- Age at study initiation: young adults
- Weight at study initiation: under 500 g
- Housing:conventional, maximum 5 animals per cage
- Diet: ad libitum
- Water: ad libitum
- Acclimation period: at leat 5 days
ENVIRONMENTAL CONDITIONS
- Temperature (°C):22 +/- 3 ° C
- Humidity (%): 30 - 70 %
- Air changes (per hr): 15-fold/hr
- Photoperiod (hrs dark / hrs light): 12/12
Study design: in vivo (non-LLNA)
Induction
- Route:
- intradermal and epicutaneous
- Vehicle:
- maize oil
- Concentration / amount:
- 5% Test material
- Adequacy of induction:
- highest concentration used causing mild-to-moderate skin irritation and well-tolerated systemically
Challenge
- Route:
- epicutaneous, occlusive
- Vehicle:
- maize oil
- Concentration / amount:
- 50% Test material
- Adequacy of challenge:
- highest non-irritant concentration
- No. of animals per dose:
- 10 animals in the main groups and 5 animals in control groups
- Details on study design:
- RANGE FINDING TESTS:
In the pre-test, a well-tolerated concentration of the test substance, which could be used for the induction phase of the main test, should be determined for intracutaneous administration.
Furthermore, a slight to moderately irritating concentration, which could be used for the induction phase of the main test, was determined for the three applications.
Finally, the maximum non-irritating concentration, which could be used for triggering, should be determined during dermal administration.
MAIN STUDY
A. INDUCTION EXPOSURE
Intracutane Induction (Day 0)
- No. of exposures: 6 injections
- Test groups: 1
- Control group: 2
- Site: shoulder area 2 x 4 cm
- Duration: Evaluation of injection sites after 1 and 24 hr after application
- Concentrations: 5% in vehicle
Dermal Induction (Day 7)
- No. of exposures: one
- Exposure period: 48 hr fixation of the patch
- Test groups: 1
- Control group: 2
- Site: shoulder area 2x4 cm
- Duration: Evaluation of the application site after 49 and 72 hr after application
- Concentrations: undiluted test item
B. CHALLENGE EXPOSURE
- No. of exposures: one
- Day(s) of challenge: Day 21
- Exposure period: Fixation of th epatch for 24 hr
- Test groups:
- Control group:
- Site: flank
- Concentrations: 50% of th etest item in vehicle
- Evaluation (hr after challenge): 24, 48, 72 hr after application
The second challenge was not performed due to the positive result in the first challenge.
- Positive control substance(s):
- not required
- Remarks:
- Sensitization testing of the guinea pig strain was performed with 2-mercaptobenzothiazole.
Results and discussion
- Positive control results:
- no positive control
In vivo (non-LLNA)
Resultsopen allclose all
- Reading:
- 1st reading
- Hours after challenge:
- 48
- Group:
- test chemical
- Dose level:
- 50% test item in maize-oil
- No. with + reactions:
- 10
- Total no. in group:
- 10
- Clinical observations:
- Erythema and Oedema
- Remarks on result:
- positive indication of skin sensitisation
- Reading:
- 2nd reading
- Hours after challenge:
- 72
- Group:
- test chemical
- Dose level:
- 50% test item in maize-oil
- No. with + reactions:
- 9
- Total no. in group:
- 10
- Clinical observations:
- erythema in 6 animals; oedema in 3 animals
- Remarks on result:
- positive indication of skin sensitisation
- Reading:
- 1st reading
- Hours after challenge:
- 48
- Group:
- positive control
- Dose level:
- 1% 2-MCBT in maize-oil
- No. with + reactions:
- 10
- Total no. in group:
- 10
- Clinical observations:
- positive skin reactions
- Remarks on result:
- positive indication of skin sensitisation
- Reading:
- 1st reading
- Hours after challenge:
- 48
- Group:
- negative control
- No. with + reactions:
- 0
- Total no. in group:
- 5
- Remarks on result:
- no indication of skin sensitisation
- Reading:
- 2nd reading
- Hours after challenge:
- 72
- Group:
- negative control
- No. with + reactions:
- 0
- Total no. in group:
- 5
- Remarks on result:
- no indication of skin sensitisation
Applicant's summary and conclusion
- Interpretation of results:
- Category 1 (skin sensitising) based on GHS criteria
- Conclusions:
- The substance is a sensitiser for skin of guinea pigs.
- Executive summary:
TRIMETHYLHEXANAL was tested on guinea pigs in the maximization test according to Manugsson and Kligman for sensitization of the skin.
In order to determine the potentially sensitizing effect of TRIMETHYLHEXANAL, a test group of 10 animals and two control groups of 5 animals each were used for the test. Any reactions, especially erythema and edema formation, were assessed 48 and 72 hours after initiation.
The 50% concentration of the test substance was administered as the maximum concentration in the pretreatment with dermal administration and no signs of systemic toxicity.
For the treatments in the induction phases, the following subdistance concentrations were determined:
- In the case of intracutaneous injection, the test substance was used in corn oil 5%.
- In the case of the dermal treatment in the induction phase II, the test substance was administered undiluted.
- In the release phase, the 50% test substance concentration in maize germ oil was administered as a non-irritating concentration.
In the pre-test, administration of the concentrated test substance to the animals resulted in slight irritation in the form of erythemas and oedemas and dandruff formation on the guinea pig skin. Pretreatment of the skin with 10% sodium dodecyl sulfate (SDS) in vaseline was not necessary.
The dermal induction treatment reactions were evaluated 49 and 72 hours post-application (p.a.):
In this case, the injection sites, which had been treated with a 5% test substance or vehicle a week before, showed 49 and 72 hours of p.a. in all test and / or control animals no irritation. Only in a test animal after 72 hours was the whole application area scraped and strongly bloody. An assessment was not possible. At all injection sites previously treated with 5% test substance preparation in FCA (test animals) and with only FCA (control animals), 49 h p.a. in 8 test and 4 control animals, moderate erythema and edema. Two test animals had severe erythema and edema with scab formation and bloody scabies at these injection sites and 6 control animals severe erythema and edema with scab formation, in two animals with bloody scalp wounds. After 72 hours, all test and 9 control animals in this area showed severe erythema and edema with scab formation, in 5 test animals, and one animal of the control group associated with bloody scratch wounds. 1 control animal at this time had moderate erythema and edema.
The triggering treatment was carried out with the 50% test substance in maize germ oil. The treatment in all test animals led to positive skin irritations in the sense of sensitization in the form of clearly circumscribed erythema and oedema, in 4 animals combined with skin dryness. After 72 hours, p.a. showed 6 animals still light with clear Haurezungen with skin dryness or dandruff formation. Two animals had only dandruff formation and two animals were free of irritation. The animals of the control group had no skin irritations after 48 hours and 72 hours after the treatment with the test substance on the right flank. Treatment of the test and control animals with the vehicle on the left flank also did not result in any irritation on the skin.
Repeated triggering with the second control group was not necessary because of the clear result.
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