1-cyclohexylethyl butyrate

Endpoint summary

Description of key information

Skin irritation (similar to OECD TG 404): not irritating
Eye irritation and severe damage (similar to OECD TG 405): not irritating

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1975-02-27

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The study is considered to be a reliability 2 study since it predates GLP but is similar to OECD TG 404.

Justification for type of information:

The results from the present in vivo study can be used and are in accordance with the current REACH regulation, because the study was performed before the REACH regulation required in vitro information.

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

GLP compliance:

no

Species:

rabbit

Strain:

New Zealand White

Type of coverage:

not specified

Preparation of test site:

not specified

Vehicle:

unchanged (no vehicle)

Controls:

other: Adjacent areas of the untreated skin of each animal served as controls.

Amount / concentration applied:

TEST MATERIAL
- Amount applied: 0.5 mL

Duration of treatment / exposure:

24 hours

Observation period:

at least 10 days

Number of animals:

6 animals

Details on study design:

REMOVAL OF TEST SUBSTANCE
24 hours after the application.

OBSERVATIONS
- Irritation: The skin reactions were assessed at approximately 4, 24, 48, 72 and 168 hours after exposure to the test substance. The irritation scores and a description of all other (local) effects were recorded.

SCORING SYSTEM:
The irritation was assessed according to the numerical scoring system according to OECD 404 (1981).

Irritation parameter:

erythema score

Basis:

mean

Time point:

other: 24, 48 and 72 hours (mean)

Score:

1.17

Max. score:

4

Reversibility:

fully reversible

Remarks:

within 7 days

Remarks on result:

other: average scores 24h, 48h and 72h were 1.33, 1.17, and 1.00, respectively

Irritation parameter:

edema score

Basis:

mean

Time point:

other: 24, 48 and 72 hours (mean)

Score:

0.44

Max. score:

4

Reversibility:

fully reversible within: 72 hours when applicable

Remarks on result:

other: average scores 24h, 48h and 72h were 1.00, 0.33, and 0, respectively

Other effects:

Slight defatting effect was observed. The skin flaked off in seven to ten days. There were no injuries in depth observed.

Skin irritation

	Time after administration
	4 hour						24 hours						48 hours						72 hours
Animal	1	2	3	4	5	6	1	2	3	4	5	6	1	2	3	4	5	6	1	2	3	4	5	6
Erythema	1	1	1	1	1	1	1	2	1	1	1	2	1	1	1	1	1	2	1	1	1	1	1	1
Edema	1	0	0	1	0	1	1	1	1	1	0	2	0	0	1	0	0	1	0	0	0	0	0	0

Interpretation of results:

other: Not irritating

Remarks:

according to the CLP Regulation EC 1272/2008

Conclusions:

In a skin irritation study with rabbits, performed similar to OECD 404, slight irritation was observed, which was fully reversible within 7 days. Based on the results of this study, the substance is considered to be not irritating to skin

Executive summary:

The substance was tested a in a skin irritation test similar to the OECD TG 404 test guideline. 6 New Zealand White rabbits were exposed for 24 hours to the undiluted test substance. The mean value for erythema from gradings at 24, 48 and 72 hours after patch removal was 1.17. For edema, this mean value was 0.44. No corrosive effects were observed. The irritation was fully reversible within 7 days. The substance is not considered to be irritating to skin, according to EU CLP criteria.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Eye irritation

Link to relevant study records

Reference

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The study is considered to be a reliability 2 study since it predates GLP but is similar to OECD TG 405.

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

GLP compliance:

no

Species:

rabbit

Strain:

New Zealand White

Vehicle:

unchanged (no vehicle)

Controls:

other: One eye of each animal remained untreated and served as the reference control.

Amount / concentration applied:

Amount applied: 0.1 mL

Duration of treatment / exposure:

Single instillation on Day 1

Observation period (in vivo):

at least 7 days

Number of animals or in vitro replicates:

6

Details on study design:

STUDY DESIGN
The test material was applied undiluted in 6 animals.

TREATMENT
Similar to OECD 405. The test substance is placed in the conjunctival sac of one eye of each animal after gently pulling the lower lid away from the eyeball. The lids are then gently held together for about one second. The other eye serves at control.

OBSERVATIONS
The eyes of each animal were examined approximately 1, 24, 48 and 72 hours and 7 days after instillation of the test substance. The irritation scores and a description of all other (local) effects were recorded.

SCORING SYSTEM:
Eye irritation was scored according to Draize at al., 1944.
Cornea score: Opacity (max score 4) x Area of cornea involved (max score 4) x 5 = maximum score of 80
Iris score: iris lesion (max score 2) x 5 = maximum score of 10
Conjunctiva score: (Redness (max score 3) + Chemosis (max score 4) + Discharge (max score 3) x 2 = maximum score of 20

Irritation parameter:

cornea opacity score

Basis:

mean

Time point:

other: mean 24, 48 and 72 hrs

Score:

0

Max. score:

80

Remarks on result:

other: Score according to Draize et al., 1944

Irritation parameter:

iris score

Basis:

mean

Time point:

other: mean 24, 48 and 72 hrs

Score:

0

Max. score:

10

Remarks on result:

other: Score according to Draize et al., 1944

Irritation parameter:

conjunctivae score

Remarks:

redness, chemosis and discharge

Basis:

mean

Time point:

other: mean 24, 48 and 72 hrs

Score:

1.3

Max. score:

20

Reversibility:

fully reversible within: 24 hours

Remarks on result:

other: Score according to Draize et al., 1944

Irritant / corrosive response data:

Immediately after application: Discomfort was slight
10 minutes: Slight erythema, moderate to copious discharge
1 hour: Slight to moderate erythema, copious discharge
24 hours: Slight erythema, slight discharge
48 hours: all scored zero

Ocular Irritant response data (for the undiluted test substance)

	Time after administration
	1 hour						24 hours						48 hours						72 hours
Animal	1	2	3	4	5	6	1	2	3	4	5	6	1	2	3	4	5	6	1	2	3	4	5	6
Cornea score	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Iris score	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Conjunctivae score (redness, chemosis and discharge	10	8	10	8	8	8	4	4	4	4	4	4	0	0	0	0	0	0	0	0	0	0	0	0

Interpretation of results:

other: not irritating

Remarks:

according to the CLP Regulation EC 1272/2008

Conclusions:

In an eye irritation study with rabbits, performed similar to OECD 405, limited irritation was observed. Based on the results of this study, the substance is not considered to be an eye irritant.

Executive summary:

The substance was tested in an eye irritation test similar to OECD 405. 0.1 mL undiluted test substance was placed in the conjuctival sac of 6 new Zealand white rabbits. The effects were scored 1, 24, 48, 72, 120, and 168 hours after application according to Draize et al., 1944. No effects on the cornea and iris were observed. The conjunctivae score after 24 hours was 4 out of 20 and was fully reversible within 48 hours. The mean irritation score (24, 48, and 72 hrs) was determined to be 1.3. Under the conditions of the test, the substance is not eye irritating.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Additional information

Skin irritation:

The substance was tested in a skin irritation test in 6 rabbits similar to OECD TG 404 (1981) test guideline. New Zealand White rabbits were exposed for 24 hours to the undiluted test substance. The mean value for erythema from gradings at 24, 48 and 72 hours after patch removal was 1.17. For edema, this mean value was 0.44 in all animals. No corrosive effect was observed. The irritation was fully reversible within 7 days. Under the condition of the test, the substance is not considered to be irritating to skin.

 

Eye irritation:

The substance was tested in an eye irritation test similar to OECD 405. 0.1 mL undiluted test substance was placed in the conjuctival sac of 6 new Zealand white rabbits. The effects were scored 1, 24, 48, 72, 120, and 163 hours after application according to Draize et al., 1944. No effects on the cornea and iris were observed. The conjunctivae score after 24 hours was 4 out of 20 for all animals and was fully reversible within 48 hours. The mean irritation score (24, 48, and 72 hrs) was determined to be 1.3. Under the conditions of the test, the substance is not eye irritating.

Justification for classification or non-classification

Based on the negative results in the skin and eye irritation tests the substance does not need to be classified for these endpoints according to EU Classification, Labeling and Packaging of Substances and Mixtures (CLP) Regulation (EC) No. 1272/2008.