β,2,2,3-tetramethylcyclopent-3-ene-1-butanol

Endpoint summary

Description of key information

Skin irritation/corrosion (OECD 439 and OECD 431): irritating

Eye irritation (OECD 437 and OECD 492): not irritating

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Reference 1

Endpoint:

skin irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

9 May - 6 Jun 2016

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:

adopted 28 Jul 2015

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method B.46 (In Vitro Skin Irritation: Reconstructed Human Epidermis Model Test)

Version / remarks:

Commission Regulation (EC) No 440/2008, 1st ATP 2009)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Hess. Ministerium für Umwelt, Klimaschutz, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany

Test system:

human skin model

Source species:

human

Cell type:

non-transformed keratinocytes

Cell source:

other: EpiDerm™

Source strain:

not specified

Vehicle:

unchanged (no vehicle)

Details on test system:

RECONSTRUCTED HUMAN EPIDERMIS (RHE) TISSUE
- Model used: EpiDerm™ (MatTek Corporation, Bratislava, Slovakia)
- Tissue batch number: 23339
- Delivery date: 31 May 2016
- Date of initiation of testing: 31 May 2016

TEMPERATURE USED FOR TEST SYSTEM
- Temperature used during treatment / exposure: 37 ± 1.5 °C for 35 min in the incubator; thereafter at room temperature for 25 min in a sterile bench

REMOVAL OF TEST MATERIAL AND CONTROLS
-Volume and number of washing steps: Tissues were gently rinsed with DPBS at least 15 times in order to remove any residual test material. After the rinsing the inserts were submerged in DPBS at least 3 times. Afterwards the inserts were once again rinsed with DPBS from the inside and the outside.

MTT DYE USED TO MEASURE TISSUE VIABILITY AFTER TREATMENT / EXPOSURE
- MTT concentration: 1 mg/mL
- Incubation time: 3 h
- Spectrophotometer: microplate reader (Versamax, Molecular Devices, Softmax Pro v.4.7.1)
- Wavelength: 570 nm

FUNCTIONAL MODEL CONDITIONS WITH REFERENCE TO HISTORICAL DATA
- Viability: The quality of the EpiDerm™ tissue was assessed by undertaking an MTT cell viability test. The determined OD (540 - 570 nm) was 1.57 ± 0.057 (acceptance criteria: 1.0 - 3.0).
- Barrier function: The barrier function was assessed by determination of the exposure time required to reduce tissue viability by 50% (ET-50) upon application of 100 µL of 1% Triton X-100. The ET-50 value was determined to be 6.51 h (acceptance criteria: 4.77-8.72 h).
- Contamination: The cells used to produce the EpiDerm™ tissue were screened for the presence of viruses, bacteria, yeast and other fungi.

NUMBER OF REPLICATE TISSUES: 3

CONTROL TISSUES USED IN CASE OF MTT DIRECT INTERFERENCE
Since the test substance did not directly reduce MTT, an additional test with freeze-killed tissues was not performed.

NUMBER OF INDEPENDENT TEST SEQUENCES / EXPERIMENTS TO DERIVE FINAL PREDICTION: single experiment

PREDICTION MODEL / DECISION CRITERIA
- The test substance is considered to be irritant to skin if the viability after 1 hour exposure is less or equal than 50%.

Control samples:

yes, concurrent negative control

yes, concurrent positive control

Amount/concentration applied:

TEST MATERIAL
- Amount applied: 30 µL

NEGATIVE CONTROL
- Amount applied: 30 µL

POSITIVE CONTROL
- Amount applied: 30 µL
- Concentration: 5% aqueous solultion

Duration of treatment / exposure:

60 min

Duration of post-treatment incubation (if applicable):

approximately 42 h

Number of replicates:

triplicates for each treatment and control group

Irritation / corrosion parameter:

% tissue viability

Remarks:

mean value of 3 tissues

Run / experiment:

60 minutes exposure

Value:

4.7

Vehicle controls validity:

not applicable

Negative controls validity:

valid

Positive controls validity:

valid

Other effects / acceptance of results:

OTHER EFFECTS:
- Direct-MTT reduction: The test substance was not considered to be a MTT reducer.
- Colour interference with MTT: The test substance did not change colour when mixed with deionised water. Also its intrinsic colour was not intensive.

ACCEPTANCE OF RESULTS:
- Acceptance criteria met for negative control: The negative control OD (1.525, 1.957 and 1.950) was in the range of the required acceptability criterion of mean OD ≥ 0.8 and ≤ 2.8 for the 60 min treatment interval thus showing the quality of the tissues.
- Acceptance criteria met for positive control: Exposure to the positive control induced a decrease in the relative absorbance as compared to the negative control to 4.3% thus confirming the validity of the test system.
- Acceptance criteria met for variability between replicate measurements: The relative standard deviations of the 3 identical replicates of the test substance and negative control in the main test were below 14% (threshold of OECD 439: <18%). Since the blank corrected absorption values of the positive control were very low (values between 0.061 and 0.089) compared with the test substance and negative control values, the acceptance criteria “% variability values in the main test were < 18%” was slightly exceeded (19%). Due to the clear positive result of the positive control, this circumstance does not affect the integrity of the study.

Table 2. Results after treatment with the test substance and controls

Test group	Mean absorbance at 570 nm*			Rel. absorbance (%)**			Rel. SD (%)	Rel. absorbance (% of negative control)***
	Tissue 1	Tissue 2	Tissue 3	Tissue 1	Tissue 2	Tissue 3
Negative control	1.525	1.957	1.950	84.2	108.1	107.7	13.7	100.0
Positive control	0.061	0.082	0.089	3.4	4.6	4.9	19.0	4.3
Test substance	0.084	0.082	0.090	4.7	4.5	4.9	4.6	4.7

* Mean of three replicate wells after blank correction (blank = 0.036)

** Relative absorbance per tissue (rounded values): 100 × (absorbance tissue) / (mean absorbance negative control)

*** Relative absorbance per treatment group (rounded values): 100 × (mean absorbance test substance/positive control) / (mean absorbance negative control)

Interpretation of results:

other: irritating potential (Skin Irrit. 2 or Skin Corr. 1 according to Regulation (EC) No 1272/2008)

Conclusions:

Under the conditions of the conducted test, the test substance possessed irritating properties towards reconstructed human epidermis tissue in the EpiDerm™ model.

Reference 2

Endpoint:

skin corrosion: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

27 Jun - 15 Jul 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 431 (In Vitro Skin Corrosion: Human Skin Model Test)

Version / remarks:

adopted 28 July 2015

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: EU B.40 bis (In Vitro Skin Corrosion: Human Skin Model Test)

Version / remarks:

Commission Regulation (EC) No 440/2008 of 30 May 2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Hess. Ministerium für Umwelt, Klimaschutz, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany

Test system:

human skin model

Source species:

human

Cell type:

non-transformed keratinocytes

Cell source:

other: EpiDerm™ (EPI-200)

Source strain:

not specified

Vehicle:

unchanged (no vehicle)

Details on test system:

RECONSTRUCTED HUMAN EPIDERMIS (RHE)
- Model used: EpiDerm™ (EPI-200) (MatTek Corporation, Bratislava, Slovakia)
- Tissue batch number: 23345
- Delivery date: 12 July 2016
- Date of initiation of testing: 12 July 2016

TEMPERATURE USED FOR TEST SYSTEM
- Temperature used during treatment / exposure: room temperature (3 ± 0.5 min exposure), 37 ± 1.5 °C (60 ± 5 min exposure)

REMOVAL OF TEST MATERIAL AND CONTROLS
-Volume and number of washing steps: Tissues were gently rinsed with DPBS (20 times) in order to remove any residual test material.

MTT DYE USED TO MEASURE TISSUE VIABILITY AFTER TREATMENT / EXPOSURE
- MTT concentration: 1 mg/mL
- Incubation time: 3 h
- Spectrophotometer: microplate reader (Versamax, Molecular Devices, SoftMax Pro Enterprise v.4.7.1)
- Wavelength: 570 nm
- Filter: without reference filter

FUNCTIONAL MODEL CONDITIONS WITH REFERENCE TO HISTORICAL DATA
- Viability: The quality of the EpiDerm™ tissue was assessed by an MTT cell viability test. The determined OD (540 - 570 nm) was 1.783 ± 0.027 (acceptance criteria: 1.0 - 3.0).
- Barrier function: The barrier function was assessed by determination of the exposure time required to reduce tissue viability by 50% (ET-50) upon application of 100 µL of 1% Triton X-100. The ET-50 value was determined to be 6.16 h (acceptance criteria: 4.77-8.72 h).
- Contamination: The cells used to produce the EpiDerm™ tissue were screened for the presence of viruses, bacteria, yeast and other fungi.

NUMBER OF REPLICATE TISSUES: 2

CONTROL TISSUES USED IN CASE OF MTT DIRECT INTERFERENCE
Since the test substance did not directly reduce the MTT solution, an additional functional check was not performed.

NUMBER OF INDEPENDENT TEST SEQUENCES / EXPERIMENTS TO DERIVE FINAL PREDICTION: single experiment

PREDICTION MODEL / DECISION CRITERIA
- The test substance is considered to be non-corrosive to skin if the viability after 3 minutes exposure is greater or equal than 50% and the viability after 1 hour exposure is greater or equal than 15%.
- The test substance is considered to be corrosive to skin if the viability after 3 minutes exposure is less than 50%, or if the viability after 3 minutes exposure is greater than or equal to 50% and the viability after 1 hour exposure is less than 15%.

Control samples:

yes, concurrent negative control

yes, concurrent positive control

Amount/concentration applied:

TEST MATERIAL
- Amount applied: 50 µL

NEGATIVE CONTROL
- Amount applied: 50 µL

POSITIVE CONTROL
- Amount applied: 50 µL
- Concentration: 8 N

Duration of treatment / exposure:

3 ± 0.5 min and 60 ± 5 min

Number of replicates:

duplicates for each treatment and control group

Irritation / corrosion parameter:

% tissue viability

Remarks:

mean value of 2 tissues

Run / experiment:

3 minutes exposure

Value:

128.1

Vehicle controls validity:

not applicable

Negative controls validity:

valid

Positive controls validity:

valid

Irritation / corrosion parameter:

% tissue viability

Remarks:

mean value of 2 tissues

Run / experiment:

60 minutes exposure

Value:

134.5

Vehicle controls validity:

not applicable

Negative controls validity:

valid

Positive controls validity:

valid

Other effects / acceptance of results:

OTHER EFFECTS
- Direct-MTT reduction: Since the test substance did not directly reduce MTT, an additional test with freeze-killed or viable tissues was not performed.
- Colour interference with MTT: The test substance did not change colour, when mixed with deionised water and thus passed the colour interference pre-test.

ACCEPTANCE OF RESULTS:
- Acceptance criteria met for negative control: The mean OD of the tissue replicates treated with the negative control was ≥ 0.8 and ≤ 2.8 for every exposure time (values between 1.693 and 1.924).
- Acceptance criteria met for positive control: The mean viability of the tissue replicates treated with the positive control for 1 hour was <15% compared to the negative control (7.9%).
- Acceptance criteria met for variability between replicate measurements: The coefficient of variation (CV) in the range 20 – 100% viability between tissue replicates is ≤ 30% (values between 0.6% and 13.2%).

Table 2. Results after treatment with the test substance and controls

Test group	Absorbance at 570 nm*		Mean absorbance of 2 tissues	Coefficient of variation (%)	Rel. absorbance (% of negative control)**
	Tissue 1	Tissue 2
3 minutes treatment
Negative control	1.784	1.691	1.737	3.8	100.0
Positive control	0.568	0.626	0.597	6.8	34.4
Test substance	2.235	2.215	2.225	0.6	128.1
60 minutes treatment
Negative control	1.826	1.727	1.776	4.0	100.0
Positive control	0.153	0.128	0.140	12.6	7.9
Test substance	2.612	2.166	2.389	13.2	134.5

* Mean of three replicate wells after blank correction (blank after 3 and 60 min exposure was 0.038 and 0.036, respectively)

** Relative absorbance (rounded values): 100 × (absorbance test substance/positive control) / (absorbance negative control)

Interpretation of results:

other: non-corrosive

Remarks:

according to Regulation (EC) No 1272/2008

Conclusions:

Under the conditions of the conducted test, the test substance did not possess corrosive properties towards reconstructed human epidermis tissue in the EpiDerm™ model.

Endpoint conclusion

Endpoint conclusion:

adverse effect observed (irritating)

Eye irritation

Link to relevant study records

Reference

Reference 1

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

29 Apr 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 437 (Bovine Corneal Opacity and Permeability Test Method for Identifying Ocular Corrosives and Severe Irritants)

Version / remarks:

July 2013

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Hess. Ministerium für Umwelt, Klimaschutz, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany

Species:

cattle

Strain:

not specified

Details on test animals or tissues and environmental conditions:

SOURCE OF COLLECTED EYES
- Source: Schlachthof Aschaffenburg, 63739 Aschaffenburg, Germany
- Characteristics of donor animals: at least 9 month old
- Storage, temperature and transport conditions of ocular tissue: The isolated eyes were transported in Hank's Buffered Salt Solution (HBSS) at ambient temperature.
- Time interval prior to initiating testing: The corneae were isolated on the same day after delivery of the eyes and directly used in the BCOP test.
- Indication of any existing defects or lesions in ocular tissue samples: All eyes were carefully examined macroscopically for defects. Those presenting defects such as vascularization, pigmentation, opacity and scratches were discarded.

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent positive control

yes, concurrent negative control

Amount / concentration applied:

TEST MATERIAL
- Amount applied: 0.75 mL

POSITIVE CONTROL
- Amount applied: 0.75 mL

NEGATIVE CONTROL
- Amount applied: 0.75 mL

Duration of treatment / exposure:

10 min at 32 ± 1 °C

Duration of post- treatment incubation (in vitro):

2 h

Number of animals or in vitro replicates:

triplicates for each treatment and control group

Details on study design:

SELECTION AND PREPARATION OF CORNEAS:
The cornea was carefully removed from the eye using scalpel and rounded scissors. A rim of about 2 mm of tissue (sclera) was left for stability and handling of the isolated cornea. Each cornea was mounted in a specially designed cornea holder.

QUALITY CHECK OF THE ISOLATED CORNEAS:
At the end of the equilibration period, the basal opacity was determined (t0). Each cornea with a value of the basal opacity >7 was discarded.

TREATMENT METHOD:
The cornea holder consists of anterior and posterior compartments, which interface with the epithelial and endothelial sides of the cornea, respectively. The endothelial side of the cornea was positioned against the sealing ring (O-ring) of the posterior part of the holder. The cornea was gently flattened over the O-ring but stretching was avoided. The anterior part of the holder was positioned on the top of the cornea and fixed in place with screws. Both compartments of the holder were filled with incubation medium. The posterior compartment was filled first to return the cornea to its natural convex position. After equilibration for about 1 hour, the anterior compartment received the test substance or the controls on the surface of the corneae. The corneae were incubated in a horizontal position at 32 ± 1 °C in the water-bath for 10 minutes.

NUMBER OF REPLICATES: 3 corneae per test group

REMOVAL OF TEST SUBSTANCE:
The test substance was rinsed off from the application side with saline.
- POST-EXPOSURE INCUBATION: 2 h in a vertical position

METHODS FOR MEASURED ENDPOINTS:
- Corneal opacity: Corneal opacity was determined by the amount of light transmission through the cornea via an opacitometer (OP_KiT opacitometer, Electro Design, France).
- Corneal permeability: The passage of sodium fluorescein dye was measured with the aid of a microplate reader (Versamax Molecular Devices) at 490 nm (OD490).

SCORING SYSTEM: In Vitro Irritancy Score (IVIS), IVIS = opacity value + (15x OD490 value)

DECISION CRITERIA:
Test substance with an IVIS > 55 was regarded as serious eye damage and labelled Category 1 according to CLP/EPS/GHS.
Test substance with an IVIS ≤ 3 was regarded as non-irritant and labelled in no category.
Test substance with an IVIS > 3; ≤ 55 no prediction can be made.

Irritation parameter:

in vitro irritation score

Run / experiment:

mean value of 3 corneae

Value:

6.26

Vehicle controls validity:

not applicable

Negative controls validity:

valid

Positive controls validity:

valid

Other effects / acceptance of results:

With the negative control (0.9% (w/v) NaCl solution in deionised water) neither an increase of opacity nor permeability of the corneae could be observed.
The positive control (2-ethoxyethanol) showed clear opacity and distinctive permeability of the corneae (mean IVIS = 82.07) corresponding to a classification as serious eye damaging.
Relative to the negative control, the test substance caused an slight increase of corneal opacity but no relevant increase in permeability (mean IVIS = 6.26) .

ACCEPTANCE OF RESULTS:
- Acceptance criteria met for negative control: The negative control resulted in opacity and permeability values that were less than the established upper limits for background opacity and permeability values for bovine corneae treated with the respective negative control.
- Acceptance criteria met for postive control: The positive control resulted in an IVIS which was within two standard deviations of the current historical mean.

Table 2. Results after 10 min incubation time.

Test group	Opacity value = Difference (t130-t0) of Opacity		Permeability at 490 nm (OD490)		IVIS	Mean IVIS
		Mean		Mean
Negative control	0	0	0.060	0.063	0.90	0.95
	0		0.066		0.99
	0		0.064		0.96
Positive control	57*		1.074*		73.11	82.07
	66*		1.586*		89.79
	61*		1.489*		83.33
Test substance	7*		0.050*		7.75	6.26
	4*		0.136*		6.04
	4*		0.067*		5.00

*: corrected values

Interpretation of results:

other: non-corrosive

Remarks:

according to Regulation (EC) No 1272/2008

Conclusions:

The irritation potential of the test substance was assessed in the BCOP assay. Application of the test substance to bovine corneae resulted in a calculated mean IVIS of 6.26. According to OECD Guideline 437 no prediction on the irritation potential can be made but the test substance does not have to be classified as serious eye irritant (Eye Dam. Cat. 1).

Reference 2

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

21 Jun - 14 Jul 2014

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 492 (Reconstructed Human Cornea-like Epithelium (RhCE) Test Method for Identifying Chemicals Not Requiring Classification and Labelling for Eye Irritation or Serious Eye Damage)

Version / remarks:

Jul 2015

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Hess. Ministerium für Umwelt, Klimaschutz, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany

Species:

human

Strain:

other: EpiOcular™

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent positive control

yes, concurrent negative control

Amount / concentration applied:

TEST MATERIAL
- Amount applied: 50 µL

NEGATIVE CONTROL
- Amount applied: 50 µL

POSITIVE CONTROL
- Amount applied: 50 µL

Duration of treatment / exposure:

30 min

Duration of post- treatment incubation (in vitro):

120 min

Number of animals or in vitro replicates:

in duplicates for each treatment and control group

Details on study design:

- RhCE tissue construct used, including batch number: EpiOcular™ tissue (MatTek In Vitro Life Science Laboratories, Bratislava, Slovakia), batch number: 23719
- Viability: The quality of the final tissue was assessed by undertaking an MTT cell viability test. The determined OD (540 - 570 nm) was 1.863 ± 0.305 (acceptance criteria: 1.1 - 3.0).
- Barrier function: The barrier function was assessed by determination of the exposure time required to reduce tissue viability by 50% (ET-50) upon application of 100 µL of 0.3% Triton X-100. The ET-50 value was determined to be 15.65 min (acceptance criteria: 12.2 - 37.5 min).
- Contamination: The cells used to produce the EpiOcular tissue were screened for the presence of viruses, bacteria, yeast and other fungi.
- Duration and temperature of exposure, post-exposure immersion and post-exposure incubation periods: 30 min exposure, 12 min post-exposure immersion and 120 min post-exposure incubation at 37 °C
- Indication of controls used for direct MTT-reducers and/or colouring test chemicals: The ability of the test substance to directly reduce MTT and to form a blue/purple reaction product was assessed in a pre-experiment. Since the MTT solution colour did not turn blue/purple, the test substance is not presumed to have reduced the MTT. An additional test with freeze-killed tissues did not have to be performed.
- Description of the method used to quantify MTT formazan: The absorbance at 570 nm of each well was measured with a plate reader (Versamax Molecular Devices, Ismaning, Germany). No reference wavelength measurement was used.
- Number of tissue replicates used per test chemical and controls: 2
- Description of evaluation criteria used including the justification for the selection of the cut-off point for the prediction model: The test substance is considered to be not irritating to eye if the tissue viability after 30 min exposure, 12 min post-exposure immersion and 120 min post-exposure incubation is >60% relative to the negative control treated tissue.
- Acceptance criteria: The results are acceptable if the negative control OD is >0.8 and <2.5 and if the mean relative viability of the positive control is below 50% of the negative control viability.
- Reference to historical data of the RhCE tissue construct: Historical control data was used to assess the validity of the test.
- Acceptable variability between tissue replicates for the test chemical, positive and negative controls: The difference of viability between the two relating tissues of a single test substance is < 20% in the same run.

Irritation parameter:

other: % tissue viability

Remarks:

mean value of 2 tissues

Run / experiment:

30 min exposure

Value:

73

Vehicle controls validity:

not applicable

Negative controls validity:

valid

Positive controls validity:

valid

Other effects / acceptance of results:

- OTHER OBSERVATIONS:
The optical pre-experiment (colour interference pre-experiment) to investigate the colour change potential of the test substance in water or isopropanol did not led to a change in colour. Optical evaluation of the MTT-reducing capacity of the test substance with MTT-reagent did not show blue colour.

ACCEPTANCE OF RESULTS:
- Acceptance criteria met for negative control: The negative control OD (1.969 and 2.033) was in the range of > 0.8 and < 2.5.
- Acceptance criteria met for positive control: Treatment with the positive control induced a decrease in the mean relative absorbance compared with the negative control to 42.3%, thus the validity of the test system is ensured.

The difference of viability between the two relating tissues of a single substance is < 20% (values between 0.5% to 10.6%) in the same run (for positive and negative control tissues and tissues of single test substance).

Table 2. Results after 30 min incubation time

Test group	Absorbance*		Mean absorbance of 2 tissues*	Rel. absorbance (%)**		Absolute value of the difference of the rel. absorbance (%) Tissue 1 and 2	Rel. absorbance (% of negative control)***
	Tissue 1	Tissue 2		Tissue 1	Tissue 2
Negative control	1.962	1.992	1.977	99.2	100.8	1.5	100.0
Positive control	0.831	0.840	0.836	42.0	42.5	0.5	42.3
Test substance	1.339	1.549	1.444	67.8	78.3	10.6	73.0

* Mean of two replicate wells after blank correction (blank = 0.038)

** Relative absorbance (rounded values): 100 × (absorbance test substance/positive control) / (mean absorbance negative control)

*** Mean relative absorbance (rounded values)

Interpretation of results:

other: CLP/EU GHS criteria not met, no classification required according to Regulation (EC) No 1272/2008

Conclusions:

Under the conditions of the conducted test, the test substance did not possess irritating properties towards human-derived epidermal keratinocytes in the EpiOcular™ model.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Skin

The skin irritation potential of the test substance was determined by an in vitro skin irritation test using a reconstructed human skin model according to OECD Guideline 439 and in compliance with GLP (2016). After treatment with the test substance for 60 min the tissue viability decreased to 4.7% compared to the negative control (threshold for irritancy ≤ 50%). Therefore, the test substance is considered to possess an irritant potential towards human-derived epidermal keratinocytes.

In a next step, the skin corrosion potential of the test substance was investigated by an in vitro skin corrosion test using a human skin model according to OECD Guideline 431 and in compliance with GLP (2016). After treatment with the test substance the tissue viability did not decrease (3 min exposure: 128.1%; 1 h exposure: 134.5%) compared to the negative control. Therefore, the test substance is not considered to be corrosive towards human-derived epidermal keratinocytes.

In conclusion, based on the available data on skin irritation/corrosion, the test substance is considered to be irritating to skin and therefore classified as Skin Irrit. 2 (H315) according to CLP.

Eye

The eye irritation potential of the test substance was determined by a bovine corneal opacity and permeability (BCOP) test according to OECD Guideline 437 and in compliance with GLP (2016). Application of the test substance to bovine corneae resulted in a calculated mean IVIS of 6.26 (threshold for serious eye damage: IVIS > 55). Thus, the test substance is not serious eye damaging (CLP Cat. 1) but a prediction for the damage cannot be made based on the BCOP test.

To exclude irritating properties towards the eyes, an in vitro eye irritation test using a human cornea model according to OECD Guideline 492 and in compliance with GLP was conducted (2016). Since the viability value of the test substance exposed tissues did not decrease below 60% (73.0%), the test substance is not considered to possess an eye irritating potential.

In conclusion, based on available results, the test substance is not considered to be irritant to the eyes.

Justification for classification or non-classification

The available data on skin irritation meet the criteria for classification as Skin Irrit. 2 (H315) according to Regulation (EC) 1272/2008.

The available data on eye irritation do not meet the criteria for classification according to Regulation (EC) 1272/2008, and are therefore conclusive but not sufficient for classification.