2-allyloxymethyl-2-ethylpropanediol

Endpoint summary

Description of key information

Based on existing datasets and structural and chemical considerations, read-across from 2-allyloxymethyl-2-ethylpropanediol to skin and eye irritation studies on 2,2 -bis(allyloxymethyl)butan-1-ol is appropriate to meet the REACH Annex VII-IX data requirements. Studies on 2,2 -bis(allyloxymethyl)butan-1 -ol show the substance is a mild irritant but do not trigger classification of the substance as a skin or eye irritant; classification of 2-allyloxymethyl-2-ethylpropanediol for skin and eye irritation is not required.

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin irritation: in vivo

Type of information:

migrated information: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

30 June to 3 July 1993

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Proprietary GLP guideline-compliant study

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Qualifier:

according to guideline

Guideline:

EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion)

GLP compliance:

yes (incl. QA statement)

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

The animals were three New Zealand White rabbits supplied by David Percival Ltd., Cheshire, UK. The animals weighed 2.02 to 2.28 kg and were 12-16 weeks old at the start of the study, they were acclimatised for a minimum of 5 days. Individuals were identified by unique numbers written on the inner surface of the ear with an indelible black marker.
The rabbits were housed individually in suspended metal cages. Free access to mains drinking water and food (RABMA Rabbit Diet, SDS Ltd., UK) was allowed throughout the study. The animal room was maintained at a temperature of 20-23°C and relative humidity of 60-66%. There were approximately 15 air changes per hour, and lighting was controlled to give 12 hours light and 12 hours darkness.

Type of coverage:

semiocclusive

Preparation of test site:

shaved

Vehicle:

unchanged (no vehicle)

Controls:

no

Amount / concentration applied:

0.5 ml test substance was applied

Duration of treatment / exposure:

4 hours

Observation period:

72 hours following patch removal

Number of animals:

2 males and 1 female

Details on study design:

On the day before the test, rabbits were clipped free of fur from the dorsal flank using veterinary clippers. Only animals with a healthy intact epidermis (by gross observation) were selected for the study. On the day of the test, a suitable test site was selected on the back of each rabbit. A quantity of 0.5 ml of the test substance was introduced under a 2.5 × 2.5 cm gauze patch and placed in position on the shorn skin. The patch was secured in place with a strip of surgical adhesive tape (Blenderm). The trunk of each rabbit was then wrapped in an elasticated corset (Tubigrip), and the animals were returned to their cages for the duration of the exposure period.
Four hours after application the corset and patches were removed, and any residual test material removed by gentle swabbing with cotton wool soaked in diethyl ether. Approximately 1 hour following patch removal, and 24, 48 and 72 hours later, the test sites were examined for evidence of primary irritation according to the scale from Draize (1959) Association of Food and Drug Officials of the United States, Austin, Texas, "The Appraisal of the Safety of Chemicals in Foods, Drugs, and Cosmetics".
The scores for erythema and oedema at the 24 and 72 hour readings were totalled for the 3 rabbits, and divided by 6 to give the primary irritation index of the test material.

Irritation parameter:

primary dermal irritation index (PDII)

Basis:

mean

Time point:

other: 24 and 73 hour readings

Score:

0.7

Max. score:

1

Reversibility:

fully reversible within: 48 hours in 2/3 rabbits

Irritant / corrosive response data:

Very slight erythema was noted at all treated skin sites 1 and 24 hours after patch removal, and at one treated skin site at the 48 hour observation. Very slight oedema was noted at two treated skin sites 1 hour after patch removal. Very slight oedema developed at one treated skin site at the 24 hour observation and persisted at the 48 hour observation. Desquamation was noted at one treated skin site at the 48 and 72 hour observations. Two treated skin sites appeared normal at the 48 hour observation. Individual readings are shown in Table 1.

Other effects:

No other effects were reported.

Table 1. Individual Skin Reactions

Skin Reaction	Reading (hours)	Individual Scores – Rabbit Number and Sex (Body weight Kg)			Total
		69 Male (2.21)	72 Male (2.28)	79 Female (2.02)
Erythema/Eschar Formation	1	1	1	1R	(3)
	24	1	1	1	3
	48	1D	0	0	(1)
	72	0D	0	0	0
Odema Formation	1	0	1	1	(2)
	24	1	0	0	1
	48	1	0	0	(1)
	72	0	0	0	0
Sum of 24 and 72 hour Readings	4
Primary Irritation Index	0.7

( ) = Total values not used for calculation of primary irritation index

D = desquamation

R = reaction extending up to 4 cm beyond treatment site

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

The test material did not produce positive criteria in any rabbit according to the EEC labelling regulations, and was classified as not irritating to rabbit skin.

Executive summary:

The skin irritant potential of TMPDE (NEOALLYL T-20) was determined in 3 New Zealand White Rabbits according to OECD method 404. Following a single 4 hour semi-occluded exposure on intact skin, the test material produced a primary irritation index of 0.7 and was classified as a mild irritant according to the Draize classification scheme. No corrosive effects were noted.

The test material was classified as a non-irritant according to EEC labelling regulations; no symbol and risk phrase are required.

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:

migrated information: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

5 to 9 July 1993

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Proprietary GLP guideline-compliant study.

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Qualifier:

according to guideline

Guideline:

EU Method B.5 (Acute Toxicity: Eye Irritation / Corrosion)

GLP compliance:

yes (incl. QA statement)

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

The animals were three New Zealand White rabbits supplied by David Percival Ltd., Cheshire, UK. The animals weighed 2.02 to 2.28 kg and were 12-16 weeks old at the start of the study, they were acclimatised for a minimum of 5 days. Individuals were identified by unique numbers written on the inner surface of the ear with an indelible black marker.

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent no treatment

Amount / concentration applied:

0.1 ml was instilled into the right eye

Duration of treatment / exposure:

Single administration

Observation period (in vivo):

72 hours following treatment

Number of animals or in vitro replicates:

3 females

Details on study design:

Immediately before the start of the test, both eyer of the provisionally selected test rabbits were examined for evidence of ocular irritation or defect with the aid of a light source from a standard ophthalmoscope. Animals showing evidence of ocular lesions were rejected and replaced.
One rabbit was initially treated , 0.1 ml test substance was instilled into the conjunctival sac of the right eye. The upper and lower lids were held together for about 1 second immediately after instillation, to prevent loss of the test material, and then released. The left eye remained untreated and was used for control purposes. Immediately after administration, an assessment of the initial pain reaction was made.
After consideration of the ocular responses produced in the first treated animal, two additional animals were treated. In order to minimise pain on instillation, one drop of local anaesthetic ("Ophthine") was instilled into both eyes of these animals 1-2 minutes before treatment.
Assessment of ocular damage/irritation was made approximately 1 hour and 24, 48 and 72 hours following treatment, according to the numerical evaluation from Draize (1959) Association of Food and Drug Officials of the United States, Austin, Texas, "The Appraisal of the Safety of Chemicals in Foods, Drugs, and Cosmetics".Examination of the eye was facilitated by the use of light source from a standard ophthalmoscope.

Irritation parameter:

cornea opacity score

Basis:

mean

Time point:

other: 24, 48 and 72 hours

Score:

0.7

Max. score:

1

Reversibility:

fully reversible within: 72 hours

Irritation parameter:

conjunctivae score

Basis:

mean

Time point:

other: 24, 48 and 72 hours

Score:

1

Max. score:

2

Reversibility:

fully reversible within: 72 hours

Irritant / corrosive response data:

Residual test material was noted around the treated eye of all animals one hour after treatment.
Diffuse corneal opacity was noted in two treated eyes at the 24 and 48 hour observations. No other corneal effects were noted. Iridial effects were noted. Minimal conjunctival irritation was noted in all treated eyes one hour after treatment with minimal to moderate conjunctival irritation at the 24 hour observation. Minimal conjunctival redness was noted in two treated eyes at the 48 hour observation.

Other effects:

No other effects reported.

Table 1. Individual ocular irritation scores

Rabbit Number & Sex (Bodyweight Kg)	Time After Treatment	Corneal Opacity	Iridial Inflammation	Conjunctival Redness	Conjuncitval Chemosis
95 Female (2.20)	24 hours	0	0	1	0
	48 hours	0	0	0	0
	72 hours	0	0	0	0
Total		0	0	1	0
Mean		0.0	0.0	0.3	0.0
96 Female (2.53)	24 hours	1	1	2	1
	48 hours	1	0	1	0
	72 hours	0	0	0	0
Total		2	1	3	1
Mean		0.7	0.3	1.0	0.3
99 Female (2.20)	24 hours	1	1	2	2
	48 hours	1	0	1	0
	72 hours	0	0	0	0
Total		2	1	3	2
Mean		0.7	0.3	1.0	0.7

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

The test material was found to be a mild eye irritant under the conditions of this study, the severity of the effects does not trigger classification of the substance as an eye irritant under CLP Regulation (EC) No 1272/2008.

Executive summary:

The eye irritant potential of TMPDE (NEOALLYL T-20) was assessed in three New Zealand White rabbits according to OECD method 405. A single instillation of the test material to the non-irrigated eye produced diffuse corneal opacity, iridial inflammation and minimal to moderate conjunctival irritation. Treated eyes appeared normal 72 hours after treatment and the severity of the effects does not trigger classification of the substance as an eye irritant under CLP Regulation (EC) No 1272/2008.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Skin and eye irritation studies which are compliant with GLP and current OECD guidelines are not available for 2 -allyloxymethyl-2 -ethylpropanediol. Based on existing datasets for 2 -allyloxymethyl-2 -ethylpropanediol and 2,2 -bis(allyloxymethyl)butan-1 -ol and structural considerations, these substances are considered to be comparable. Read-across from 2 -allyloxymethyl-2 -ethylpropanediol to skin and eye irritation studies on 2,2 -bis(allyloxymethyl)butan-1 -ol is therefore appropriate in order to meet the REACH Annex VII-IX data requirements for 2 -allyloxymethyl-2 -ethylpropanediol for which studies are not available. Read-across is scientifically justified and also enables the REACH requirements to be adequately addressed, while avoiding unnecessary animal testing in accordance with EU Directive 86/609/EEC.

The potential for 2,2 -bis(allyloxymethyl)butan-1 -ol to cause skin and eye irritation studies have been investigated in studies using the test substance trimethyllolpropane diallyl ether (TMPDE) conducted according to OECD Test Guidelines 404 and 405 respectively. Mild skin and eye irritation only was observed in respective skin and eye irritation studies using the test substance TMPDE (Driscoll, 1993). These results do not trigger classification for skin or for eye irritation. Based on read-across to these studies, 2 -allyloxymethyl-2 -ethylpropanediol is similarly predicted to cause mild skin and eye irritation effects but does not require classification.

In a study to determine the acute dermal toxicity and skin penetration of 2 -allyloxymethyl-2 -ethylpropanediol and 2,2 -bis(allyloxymethyl)butan-1 –ol, skin necrosis was noted at high doses of 15.8 g/kg bw (McNerney et al, 1961). 

Justification for selection of skin irritation / corrosion endpoint:
Based on existing datasets and structural and chemical considerations, read-across from 2-allyloxymethyl-2-ethylpropanediol to skin irritation studies on 2,2 -bis(allyloxymethyl)butan-1 -ol is appropriate to meet the REACH Annex VII-IX data requirements. In a modern GLP study, conducted in compliance with relevant test guideline, the test substance 2,2 -bis(allyloxymethyl)butan-1 -ol was mildly irritating but did not require classification for skin irritation.

Justification for selection of eye irritation endpoint:
Based on existing datasets and structural and chemical considerations, read-across from 2-allyloxymethyl-2-ethylpropanediol to eye irritation studies on 2,2 -bis(allyloxymethyl)butan-1 -ol is appropriate to meet the REACH Annex VII-IX data requirements. In a modern GLP study, conducted in compliance with relevant test guideline, the test substance 2,2 -bis(allyloxymethyl)butan-1 -ol was mildly irritating but did not require classification for eye irritation.

Justification for classification or non-classification

Based on read-across to results from skin and eye irritation studies conducted using 2,2 -bis(allyloxymethyl)butan-1 -ol, the substance 2 -allyloxymethyl-2 -ethylpropanediol is not predicted to cause skin or eye irritation. The substance does not meet the criteria for classification for skin or eye irritation according to Directive 67/548/EEC or Regulation 1272/2008/EC.