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EC number: 826-122-1 | CAS number: 13431-57-7
- 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
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Endpoint summary
Administrative data
Description of key information
In-vitro testing showed that the substance is not irritating to skin (OECD 439, GLP).
In-vitro testing showed that the substance is not irritating to the eyes (OECD 492, GLP).
Key value for chemical safety assessment
Skin irritation / corrosion
Link to relevant study records
- Endpoint:
- skin irritation: in vitro / ex vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2016-2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method)
- Version / remarks:
- July 28, 2015
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: B.46: In Vitro Skin Irritation: Reconstructed Human Epidermis Model Test; Official Journal of the European Union, No. L 193
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Specific details on test material used for the study:
- The test item was homogeneous by visual inspection.
Storage conditions: Room temperature
Batch No.: VFH-2016-08 - Test system:
- human skin model
- Source species:
- human
- Cell type:
- non-transformed keratinocytes
- Cell source:
- foreskin from multiple donors
- Source strain:
- not specified
- Vehicle:
- unchanged (no vehicle)
- Details on test system:
- RECONSTRUCTED HUMAN EPIDERMIS (RHE) TISSUE
- Model used: EpiDermTM model
- Tissue batch number(s): 25863 and 25857
- Date of initiation of testing: 26 Oct 2017
TEMPERATURE USED FOR TEST SYSTEM
- Temperature used during treatment / exposure: The tissues were kept under the laminar flow hood at room temperature for 25 minutes overall and for 35 minutes in the incubator.(37°C)
After removal of the test material, the tissues were incubated in the incubator at 37°C for 24 ± 2 hours.
REMOVAL OF TEST MATERIAL AND CONTROLS
-Volume and number of washing steps: The tissues were washed with sterile PBS to remove residual test material 1 hour after start of
application. Rinsed tissues were blotted on sterile absorbent paper and transferred into new 6-well plates,
pre-filled with 0.9 mL fresh medium. When all tissues were rinsed, the surface of each tissue was carefully dried with a sterile cotton swab.
- Observable damage in the tissue due to washing: None
FUNCTIONAL MODEL CONDITIONS WITH REFERENCE TO HISTORICAL DATA
Historic Range negative control (OD570)
Mean OD SD Mean + 2 SD Mean - 2 SD
2.289 0.285 2.860 1.719
Historic Range of positive control (OD570)
Mean OD SD Mean + 2 SD Mean - 2 SD
0.070 0.011 0.092 0.047
Viability (%)
Mean % SD Mean + 2 SD Mean - 2 SD
3.1 0.5 4.0 2.1
NUMBER OF REPLICATE TISSUES: Three per test group
CONTROL TISSUES USED IN CASE OF MTT DIRECT INTERFERENCE
- Fresh tissues and killed tissues
- Procedure used to prepare the killed tissues: freeze-kill
- N. of replicates : 3
In case of direct reduction of MTT by the test substance, the OD570 values measured in the freeze-killed control tissues (KC) will be used to correct the mean OD570 of the test-substance treated tissues (mean OD570 KC corrected). Since killed tissue might still have a residual enzyme activity that is able to produce some formazan net OD570 KC is calculated by subtracting the OD570 KC of the NC from the OD570 KC of the test substance. In case the net OD570 KC is greater than zero it is subtracted from the respective mean OD570 to result in the mean OD570 KC corrected. The mean OD570 KC corrected represents the formazan production linked to the tissue viability and therefore indicates the cytotoxic potency of the test substance.
NUMBER OF INDEPENDENT TEST SEQUENCES / EXPERIMENTS TO DERIVE FINAL PREDICTION: 2
PREDICTION MODEL / DECISION CRITERIA
A chemical is considered as "irritant", if the mean relative tissue viability with a test material is less than or equal to 50% after a 60min exposure.
A single test composed of at least three tissue replicates should be sufficient for a test chemical when the result is unequivocal. However, in cases of borderline results, such as nonconcordant
replicate measurements and/or mean percent tissue viability equal to ±5% of the cited cut-off value, a second test should be considered, as well as a third one in case of discordant results between the first two tests.
- Observable damage in the tissue due to washing: None
MTT-Treatment:
After the postincubation period, the assay medium was replaced by 0.3 mL MTT solution and the tissues were incubated in the incubator for 3 hours.
After incubation, the tissues were washed with PBS to stop the MTT-incubation. The formazan that was metabolically produced by the tissues was extracted by incubation of the tissues in isopropanol. The optical density at a wavelength of 570 nm (OD570) of the extracts was determined spectrophotometrically. Blank values were established of 4 microtiter wells filled with isopropanol for each microtiter plate. - Control samples:
- yes, concurrent negative control
- yes, concurrent positive control
- yes, concurrent MTT non-specific colour control
- Amount/concentration applied:
- 30 µL
- Duration of treatment / exposure:
- 60 min
- Duration of post-treatment incubation (if applicable):
- 24h
- Number of replicates:
- 3
- Details on study design:
- Test system:
- In vitro test system on three dimensional human epidermis models. The EpiDermTM model consists of normal, human-derived epidermal keratinocytes cultured to form a multi layered, highly differentiated model of the human epidermis. It consists of organized basal, spinous and granular layers, and a multi-layered stratum corneum containing intercellular lamellar lipid layers arranged in patterns analogous to those found in vivo.
- The test system is based on the experience that irritant chemicals produce cytotoxicity in human reconstructed epidermis after a 1-hour topical exposure and about 42 hours postincubation.
Material and technical equipment:
- EpiDerm™ 200 kit: MatTek Corp., Bratislava, Slovakia containing 24 Epi-200 tissues (reconstructed epidermis): surface 0.6 cm² cultured in Millicells® diameter 1 cm.
Controls:
- Negative control (NC): 30 μL PBS, sterile
- Positive control (PC): 30 µL 5% (w/v) sodium dodecyl sulfate (SDS, Sigma, Germany) in deionized water, sterile
Experimental procedure:
- Direct MTT reduction:
To assess the ability of the test material to directly reduce MTT a pretest was performed. Thereby, the test substance was added to 0.9 mL of the MTT solution. A negative control (de-ionized water) was tested concurrently. If the MTT solution colour or, in case of water-insoluble test substances the border to the water-phase, turned blue / purple, the test substance was presumed to directly reduce MTT. The direct reduction of MTT by a test substance interferes with the colour density produced by metabolic capacity of the tissue and would falsify the test results.
- Basic procedure:
Three tissues were treated with the test substance, the PC and NC, respectively.
• a volume of 30 μL of the liquid test material was applied with a pipette. A nylon mesh was placed carefully onto the tissue surface afterwards.
• 1 hour after start of application of the test material to the stratum corneum surface of the EpiDermTM tissue, residual test material was removed with sterile PBS and the surface of each tissue was dried. Subsequently, the tissues were incubated at 37°C for 24 ± 2 hours, transferred into new 6-well plates pre-filled with 0.9 mL of fresh medium and thereafter placed into the incubator for additional 18 ± 2 hours post-incubation period.
• After the postincubation period induced tissue destruction (cytotoxicity = loss of viability) was determined by measuring the metabolic activity of the tissue using a colourimetric assay. Thereby, cytotoxicity is expressed as the reduction of mitochondrial dehydrogenase activity. The mitochondrial dehydrogenase reduces the yellow coloured water-soluble 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) to the insoluble blue coloured formazan. After isopropanol extraction of the formazan from the tissues, the optical densitiy of the extract is determined spectrophotometrically. Optical density of the extracts of test substance treated tissues is compared to negative control values and expressed as relative tissue viability.
Acceptance criteria:
In case one of the below given acceptance criteria is not covered, repetition of the test is considered.
- Assay acceptance criterion for the negative control (NC): The absolute OD570 of the negative control tissues in the MTT-test is an indicator of tissue viability obtained in the testing laboratory after the shipping and storing procedure and under specific conditions of the assay. Tissue viability is acceptable if the mean OD570 of the NC is ≥ 1.0. The mean OD570 of the NC should not exceed 2.5.
- Assay acceptance criterion for the positive control (PC): 5% SDS is used as PC and reflects the sensitivity of the tissues used in the test conditions. A viability of ≤ 20% is acceptable.
- Assay acceptance criterion for tissue variability: For every treatment, 3 tissues are treated in parallel. The inter-tissue variability is considered to be acceptable if the SD of %-viability is ≤ 20.
Evaluation criteria:
- Irritant potential of the test materials is predicted from the mean relative tissue viabilities compared to the negative control tissues concurrently treated with sterile PBS. A chemical is considered as "irritant", if the mean relative tissue viability with a test material is less than or equal to 50% - Irritation / corrosion parameter:
- % tissue viability
- Run / experiment:
- mean of 1st run
- Value:
- 67.1
- Vehicle controls validity:
- valid
- Negative controls validity:
- not applicable
- Positive controls validity:
- valid
- Remarks on result:
- no indication of irritation
- Irritation / corrosion parameter:
- % tissue viability
- Run / experiment:
- mean of 2nd run
- Value:
- 74.2
- Vehicle controls validity:
- valid
- Negative controls validity:
- not examined
- Positive controls validity:
- valid
- Remarks on result:
- no indication of irritation
- Other effects / acceptance of results:
- The test substance is able to reduce MTT directly. Therefore an additional MTT reduction control KC (freeze-killed control tissues) was introduced.
In a pretest it was demonstrated that the color of the test substance did not interfere with the colorimetric test. - Interpretation of results:
- GHS criteria not met
- Conclusions:
- In-vitro testing showed that the substance is not irritating to skin (OECD 439, GLP).
- Executive summary:
The objective was to assess the skin corrosion and irritation potential of the test substance. Using the methods currently available, a single in vitro assay is not sufficient to cover the full range of skin irritating/corrosion potential including transport classification. Therefore, three in vitro assays were proposed for this in vitro skin irritation and corrosion test strategy including transport classification: The Skin Corrosion Test (SCT), Skin Irritation Test (SIT) and In vitro Membrane Barrier Test (Corrositex®). However, in the current case, the results derived with SIT and SCT were sufficient for a final assessment. Therefore, further testing in Corrositex® was waived.
A GLP conform guideline study was conducted.The potential of the test substance to cause dermal corrosion/irritation was assessed by a single topical application of 50μL (corrosion test) or 30μL (irritation test) undiluted test substance to a reconstructed three-dimensional, human epidermis model (EpiDerm™).
For the corrosion test, two EpiDerm™ tissues were incubated with the test substance for 3 minutes and 1 hour each. The irritation test was performed with three EpiDerm™ tissues for each test run, which were incubated with the test substance for 1 hour followed by a 42-hour post-incubation period. Tissue destruction was determined by measuring the metabolic activity of the tissue after exposure/post-incubation by using a colorimetric test. The reduction of mitochondrial dehydrogenase activity measured by reduced formazan production after incubation with a tetrazolium salt (MTT) was chosen as endpoint. The formazan production of the epidermal tissues treated with the test substance is compared to that of negative control tissues. The quotient of the values indicates the relative tissue viability.
The following results were obtained in the EpiDerm™ skin corrosion/irritation test:
The test substance is able to reduce MTT directly. Therefore, an additional MTT reduction control KC (freeze-killed control tissues) was introduced.
Corrosion test: The final relative mean viability of the tissues treated with the test substance determined after an exposure period of 3 minutes was 99.0%, and it was 91.4% after an exposure period of 1 hour.
Irritation test: Two test runs of the EpiDermTM skin irritation test were performed. 1st test run: The final relative mean viability of the tissues treated with the test substance determined after an exposure period of 1 hour with an about 42-hour post-incubation was 67.1% (values for individual tissues (without KC correction): 50.6%, 72.4% and 78.5%). Because high inter-tissue variability of the test-substance treated tissues was obtained, a second experiment was performed to verify the result. 2nd test run: The final relative mean viability of the tissues treated with the test substance for the 2nd test run was 74.2% (values for individual tissues (without KC correction): 52.5%, 72.8% and 97.6%). Again, high inter-tissue variability of the test-substance treated tissues was obtained. In addition, the SD of % viability of the test-substance treated tissues was out of the acceptance range.However, since all other quality criteria of the test were met and the viability values of four out of six tissues are well above the cutoff for skin irritation and the viability values of two tissue lie within the borderline range, this deviation is not considered to affect the evaluation of this study adversely.Overall, the obtained results of both test runs did not indicate an irritation potential of the test substance.
Based on the results observed and by applying the evaluation criteria it was concluded that the test substance does not show a skin irritation potential in the EpiDerm™ in vitro skin irritation and corrosion test strategy including transport classification under the test conditions chosen.
Reference
First run (final relative mean viability of KC correction = 67.1%) | |||||||
tissue 1 | tissue 2 | tissue 3 | mean | intertissue variability | |||
negative control | viable tissues | OD570 | 1.599 | 1.907 | 1.823 | 1.1776 | |
viability (% of NC) | 90 | 107.3 | 10.6 | 100 | 8.9 | ||
KC tissues | OD570 | 0.052 | 0.058 | 0.059 | 0.056 | ||
viability (% of NC) | 2.9 | 3.3 | 3.3 | 3.2 | 0.2 | ||
test item | viable tissues | OD570 | 0.898 | 1.286 | 1.395 | 1.193 | |
viability (% of NC) | 50.6 | 72.4 | 78.5 | 67.2 | 14.7 | ||
KC tissues | OD570 | 0.001 | 0 | 0.001 | 0.001 | ||
viability (% of NC) | 0.038 | 0 | 0.066 | 0.034 | 0.03 | ||
Positive control | viable tissues | OD570 | 0.039 | 0.049 | 0.047 | 0.045 | |
viability (% of NC) | 2.2 | 2.7 | 2.6 | 2.5 | 0.3 |
Second run (final relative mean viability of KC correction = 74.2%) | |||||||
tissue 1 | tissue 2 | tissue 3 | mean | intertissue variability | |||
negative control | viable tissues | OD570 | 1.887 | 1.829 | 1.82 | 1.845 | |
viability (% of NC) | 102.3 | 99.1 | 98.6 | 100 | 2 | ||
KC tissues | OD570 | 0.047 | 0.049 | 0.045 | 0.047 | ||
viability (% of NC) | 2.5 | 2.7 | 2.4 | 2.5 | 0.1 | ||
test item | viable tissues | OD570 | 0.968 | 1.343 | 1.8 | 1.37 | |
viability (% of NC) | 52.5 | 72.8 | 97.6 | 74.3 | 22.6 | ||
KC tissues | OD570 | 0.001 | 0 | 0.002 | 0.001 | ||
viability (% of NC) | 0.036 | 0 | 0.09 | 0.042 | 0 | ||
Positive control | viable tissues | OD570 | 0.052 | 0.045 | 0.041 | 0.046 | |
viability (% of NC) | 2.8 | 2.4 | 2.2 | 2.5 | 0.3 |
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (not irritating)
Eye irritation
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (not irritating)
Respiratory irritation
Endpoint conclusion
- Endpoint conclusion:
- no study available
Additional information
Skin irritation/corrosion
The objective was to assess the skin corrosion and irritation potential of the test substance.
Using the methods currently available, a single in vitro assay is not sufficient to cover the full range of skin irritating/corrosion potential including transport classification. Therefore, three in vitro assays were proposed for this in vitro skin irritation and corrosion test strategy including transport classification: The Skin Corrosion Test (SCT), Skin Irritation Test (SIT) and In vitro Membrane Barrier Test (Corrositex®). However, in the current case, the results derived with SIT and SCT were sufficient for a final assessment. Therefore, further testing in Corrositex® was waived.
A GLP conform guideline study was conducted. The potential of the test substance to cause dermal corrosion/irritation was assessed by a single topical application of 50μL (corrosion test) or 30μL (irritation test) undiluted test substance to a reconstructed three-dimensional, human epidermis model (EpiDerm™).
For the corrosion test, two EpiDerm™ tissues were incubated with the test substance for 3 minutes and 1 hour each. The irritation test was performed with three EpiDerm™ tissues for each test run, which were incubated with the test substance for 1 hour followed by a 42-hour post-incubation period. Tissue destruction was determined by measuring the metabolic activity of the tissue after exposure/post-incubation by using a colorimetric test. The reduction of mitochondrial dehydrogenase activity measured by reduced formazan production after incubation with a tetrazolium salt (MTT) was chosen as endpoint. The formazan production of the epidermal tissues treated with the test substance is compared to that of negative control tissues. The quotient of the values indicates the relative tissue viability.
The following results were obtained in the EpiDerm™ skin corrosion/irritation test:
The test substance is able to reduce MTT directly. Therefore, an additional MTT reduction control KC (freeze-killed control tissues) was introduced.
Corrosion test: The final relative mean viability of the tissues treated with the test substance determined after an exposure period of 3 minutes was 99.0%, and it was 91.4% after an exposure period of 1 hour.
Irritation test: Two test runs of the EpiDermTM skin irritation test were performed. 1st test run: The final relative mean viability of the tissues treated with the test substance determined after an exposure period of 1 hour with an about 42-hour post-incubation was 67.1% (values for individual tissues (without KC correction): 50.6%, 72.4% and 78.5%). Because high inter-tissue variability of the test-substance treated tissues was obtained, a second experiment was performed to verify the result. 2nd test run: The final relative mean viability of the tissues treated with the test substance for the 2nd test run was 74.2% (values for individual tissues (without KC correction): 52.5%, 72.8% and 97.6%). Again, high inter-tissue variability of the test-substance treated tissues was obtained. In addition, the SD of % viability of the test-substance treated tissues was out of the acceptance range. However, since all other quality criteria of the test were met and the viability values of four out of six tissues are well above the cutoff for skin irritation and the viability values of two tissue lie within the borderline range, this deviation is not considered to affect the evaluation of this study adversely. Overall, the obtained results of both test runs did not indicate an irritation potential of the test substance.
Based on the results observed and by applying the evaluation criteria it was concluded that the test substance does not show a skin irritation potential in the EpiDerm™ in vitro skin irritation and corrosion test strategy including transport classification under the test conditions chosen.
Eye irritation
The objective was to assess the eye irritating potential of test substance. By using the methods currently available a single in vitro assay is not sufficient to cover the full range of eye irritating potential. Therefore, two in vitro assays were part of this in vitro eye irritation test strategy: The Bovine Corneal Opacity and Permeability Test (BCOP Test) and EpiOcular Eye Irritation Test.
However, in the current case the results derived with EpiOcular alone were sufficient for a final assessment. Therefore, further testing in BCOP was waived.
A GLP-conform guideline study was conducted.
The potential of the test substance to cause ocular irritation was assessed by a single topical application of 50μL undiluted test substance to a reconstructed three-dimensional, human cornea model (EpiOcular™). Two EpiOcular™ tissues were incubated with the test substance for 30 minutes followed by a 2-hour post-incubation period. Tissue destruction was determined by measuring the metabolic activity of the tissue after exposure/post-incubation by using a colorimetric test. The reduction of mitochondrial dehydrogenase activity measured by reduced formazan production after incubation with a tetrazolium salt (MTT) was chosen as endpoint. The formazan production of the epidermal tissues treated with the test substance is compared to that of negative control tissues. The ratio of the values indicates the relative tissue viability. The following results were obtained in the EpiOcular™ eye irritation assay: The test substance is able to directly reduce MTT. Therefore, an additional MTT reduction control (freeze-killed control tissues (KC)) was introduced. The final relative mean viability of the tissues treated with the test substance was 73.4%. Potential compound residues remained on the tissues treated with the test substance after the washing procedure (viable tissues, only). Based on the results observed in the EpiOcular Test alone and by applying the evaluation criteria described in chapter 3.10, it was concluded that the test substance does not show an eye irritation potential in the in vitro eye irritation test strategy under the test conditions chosen.
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 1272/2008. As a result, the substance is not considered to be classified for irritation under Regulation (EC) No. 1272/2008, as amended for the thirteenth time in Regulation (EC) No. 2018/1480.
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