Ethyl methacrylate

Eye irritation

Administrative data

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:

test procedure in accordance with national standard methods with acceptable restrictions

Remarks:

DATA QUALITY: Study meets minimum scientific standards for an eye irritation study and provides sufficient information regarding the irritation potential of the test substance. However, there was a limited description of the substance (i.e. purity, CAS#, etc.) Thus, the results are regarded as reliable with restriction.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1980

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: Federal Hazardous Substances Labelling Act Regulations, Section 191.12, Federal Register: 29, 13009 (1964)

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

Ethyl methacrylate

EC Number:

202-597-5

EC Name:

Ethyl methacrylate

Cas Number:

97-63-2

Molecular formula:

C6H10O2

IUPAC Name:

ethyl methacrylate

Test material form:

other: liquid

Details on test material:

Ethyl methacrylate, purity not specified but typicallly > 99 %

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Test system

Vehicle:

unchanged (no vehicle)

Amount / concentration applied:

Amount applied: 0.1 ml

Duration of treatment / exposure:

72 hour(s)

Number of animals or in vitro replicates:

6

Details on study design:

Six female NZ White rabbits, weighing 2-2.5 kg,  were administered 0.1 ml  (vol) of test compound into the everted lower lid of one eye of each  rabbit; eyelids were closed and held shut for 1 second. Prior to  administration the eyes of each rabbit were examined.  Eyes remained  unwashed. Eyes scored at 24, 48 and 72 hrs after administration with the  aid of an ophthalmoscope and Fluorescein sodium. The eyes were unwashed.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

cornea opacity score

Basis:

animal: #1, #4, #5, #6

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 2

Irritation parameter:

cornea opacity score

Basis:

animal: #2, #3

Time point:

24/48/72 h

Score:

0.33

Max. score:

4

Reversibility:

fully reversible within: 48 h

Results 3

Irritation parameter:

iris score

Basis:

mean

Time point:

24/48/72 h

Score:

0

Max. score:

2

Results 4

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #5

Time point:

24/48/72 h

Score:

0.33

Max. score:

3

Reversibility:

fully reversible within: 48 h

Results 5

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #6

Time point:

24/48/72 h

Score:

1

Max. score:

3

Reversibility:

fully reversible within: 72 h

Results 6

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #4

Time point:

24/48/72 h

Score:

1.33

Max. score:

3

Reversibility:

not fully reversible within: 72 h

Remarks on result:

other: scores are showing tendency in reversibility

Results 7

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal: #1, #3

Time point:

24/48/72 h

Score:

2.33

Max. score:

3

Reversibility:

not fully reversible within: 72 h

Remarks on result:

other: scores are showing tendency in reversibility

Results 8

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #2

Time point:

24/48/72 h

Score:

2.66

Max. score:

3

Reversibility:

not fully reversible within: 72 h

Remarks on result:

other: scores are showing tendency in reversibility

Results 9

Irritation parameter:

chemosis score

Basis:

animal: #4, 5, 6

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 10

Irritation parameter:

chemosis score

Basis:

animal #3

Time point:

24/48/72 h

Score:

1.33

Max. score:

4

Reversibility:

fully reversible within: 72 h

Remarks on result:

other: scores are showing tendency in reversibility

Results 11

Irritation parameter:

chemosis score

Basis:

animal #1

Time point:

24/48/72 h

Score:

2

Max. score:

4

Reversibility:

not fully reversible within: 72 h

Remarks on result:

other: scores are showing tendency in reversibility

Results 12

Irritation parameter:

chemosis score

Basis:

animal #2

Time point:

24/48/72 h

Score:

2.66

Max. score:

4

Reversibility:

not fully reversible within: 72 h

Remarks on result:

other: scores are showing tendency in reversibility

Irritant / corrosive response data:

Conjunctival irritation, redness (max. grade 3 in 3/6 rabbits) and  chemosis (max. grade 3 in 2/6 rabbits) at 24 hr. Irritation (redness and  chemosis), grade 3, was still present at 48 hr in 3/6 rabbits. At 72 hrs  the irritation (redness) was grade 2 in 1/6,  grade 1 in 3/6; chemosis  was grade 2 in 1/6, grade 1 in 1/6 and 0 in 4/6 rabbits. Slight  irritation of the cornea was observed after 24 h in 2/6 animals which was  reversible after 48 h. There was no involvement of the iris.

Any other information on results incl. tables

Animal No.	Corneal opacity/Hornhauttrübung[Scores]			Mean Draize score
	after 24 h	after 48 h	after 72 h
1)	0	0	0	0,0
2)	1	0	0	0,33
3)	1	0	0	0,33
4)	0	0	0	0,0
5)	0	0	0	0,0
6)	0	0	0	0,0
	0,33	0,0	0,0	0,11
Animal No.	Iritis/Regenbogenhautentzündung[Scores]			Mean Draize score
	after 24 h	after 48 h	after 72 h
1)	0	0	0	0
2)	0	0	0	0,0
3)	0	0	0	0,0
4)	0	0	0	0,0
5)	0	0	0	0,0
6)	0	0	0	0,0
	0,0	0,0	0,0	0,0
Animal No.	Conjunctiva redness (erythem) /Bindehautrötung[Scores]			Mean Draize score
	after 24 h	after 48 h	after 72 h
1)	3	3	1	2,33
2)	3	3	2	2,67
3)	3	3	1	2,33
4)	2	1	1	1,33
5)	1	0	0	0,33
6)	2	1	0	1
	2,33	1,83	0,83	1,67

Animal No.	Conjunctiva chemosis /Bindehautödem[Scores]			Mean Draize score
	after 24 h	after 48 h	after 72 h
1)	3	2	1	2
2)	3	2	2	2,33
3)	2	2	0	1,33
4)	0	0	0	0,0
5)	0	0	0	0,0
6)	1	0	0	0,33
	1,5	1	0,5	1

Applicant's summary and conclusion

Interpretation of results:

slightly irritating

Conclusions:

Classification: not irritating

Executive summary:

In an occular irritation test acc. the federal Hazardous Substances and Labelling Act Regulations, Section 191.12 published in the Federal Register - 29 F.R. 13009, 1964. Ethyl methacrylate (0.1 ml) was placed in the conjunctival sac of the right eye of six New Zealand White rabbits. The lids were then gently held together for one second.   The test eyes were not washed out following the instillation.   The left eye remained untreated for control.  The eyes were examined at 1, 24, 48 and 72 hours. Eye irritation was scored for signs of corneal damage (density, area), iris reaction and lesions of the conjunctivae (erythema, chemosis). Additionally, the cornea was examined with the aid of fluorescein after recording the observations at 24 hours. No observation after 72 hrs. Scores were reevaluated acc. CLP criteria. Highest mean cornea score (24+48+72 h) was 0.33 in 2/6 animals, no animal showed iritis, 3/6 animals showed conjunctival erythema > 2 and 2/6 animals cunjunctival chemosis > 2. Scores showed clear tendency in rapid reversibility but during the short observation time (72 h) full reversibility could not be observed in all animals (scores in 2/6 animals were fully reversible).