Oxirane, 2,2'-[methylenebis[(2,6-dimethyl-4,1-phenylene)oxymethylene]]bis-

Endpoint summary

Description of key information

Acute oral toxicity

Under the conditions of the study, the acute oral median lethal dose (LD50) of the test material in the Sprague­ Dawley CD strain rat was estimated to be greater than 2000 mg/kg bodyweight.

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records

Reference

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

28 June 2001 to 18 July 2001

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Version / remarks:

1996

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test type:

acute toxic class method

Limit test:

yes

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Females nulliparous and non-pregnant: yes
- Age at study initiation: ca 8 weeks old
- Weight at study initiation: at least 200 g
- Fasting period before study: yes - animals were fasted overnight immediately before dosing and for aproximately 3 - 4 hours after dosing
- Housing: animals were housed in groups of three by sex in solid-floor polypropylene cages furnished with woodflakes
- Diet: ad libitum
- Water: ad libitum
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature: 19 - 25 °C
- Humidity: 30 - 70 %
- Air changes: at least 15 air changes per hour
- Photoperiod: 12 hours continuous light (06:00 to 18:00) and 12 hours darkness

Route of administration:

oral: gavage

Vehicle:

arachis oil

Details on oral exposure:

DOSING PROCEDURE
All animals were dosed once only. The volume administered to each animal was calculated according to the fasted bodyweight at the time of dosing. Treatment of the animals was sequential. Sufficient time was allowed between each sex to confirm the survival of the previously dosed animals.

DOSE VOLUME: 10 mL/kg

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

3

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: The animals were observed for deaths or overt signs of toxicity 0.5, 1, 2, and 4 hours after dosing and daily thereafter for 14 days. Individual bodyweights were recorded prior to dosing and 7 and 14 days after treatment.
- Necropsy of survivors performed: yes. At the end of the observation period the animals were sacrificed by cervical dislocation. All animals were subjected to gross pathologocal examination. This consisted of an external examination and opening of the abdominal and thoracic cavities for examination of major organs. The appearance of any macroscopic abnormalities was recorded. No tissues were retained.

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

None of the animals died during the study.

Clinical signs:

other: There were no signs of systemic toxicity.

Gross pathology:

No abnormalities were noted at necropsy.

Interpretation of results:

other: Not classified according to EU criteria

Conclusions:

Under the conditions of the study the acute oral median lethal dose (LD50) of the test material in the Sprague­ Dawley CD strain rat was concluded to be greater than 2000 mg/kg bodyweight.

Executive summary:

The acute oral toxicity of the test material was investigated in a study which was conducted in accordance with the standardised guidelines OECD 423 and EU Method B.1 tris, under GLP conditions.

During the study a group of three fasted females was treated with the starting dose. This was followed by a group of three fasted animals of the other sex at the same dose level. Dosing was performed sequentially. Sufficient time was allowed between each sex to confirm the survival of the previously dosed animals.

The test material was administered orally as a suspension in arachis oil BP.  The animals were observed 1/2, 1, 2 and 4 hours after dosing and then once daily for fourteen days. Bodyweights were recorded on Day 0 (day of dosing) and on Days 7 and 14.  At the end of the observation period all animals were killed by cervical dislocation and subjected to gross necropsy.

Under the conditions of the study, none of the animals died, there were no signs of systemic toxicity and all animals showed an expected gain in bodyweight. No abnormalities were noted at necropsy.

The acute oral median lethal dose (LD50) of the test material in the Sprague­ Dawley CD strain rat was concluded to be greater than 2000 mg/kg bodyweight.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

LD50

Value:

2 000 mg/kg bw

Acute toxicity: via inhalation route

Endpoint conclusion

Endpoint conclusion:

no study available

Acute toxicity: via dermal route

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Acute oral toxicity

The acute oral toxicity of the test material was investigated in a study which was conducted in accordance with the standardised guidelines OECD 423 and EU Method B.1 tris, under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

During the study a group of three fasted females was treated with the starting dose. This was followed by a group of three fasted animals of the other sex at the same dose level. Dosing was performed sequentially. Sufficient time was allowed between each sex to confirm the survival of the previously dosed animals.

The test material was administered orally as a suspension in arachis oil BP.  The animals were observed 1/2, 1, 2 and 4 hours after dosing and then once daily for fourteen days. Bodyweights were recorded on Day 0 (day of dosing) and on Days 7 and  14.  At the end of the observation period all animals were killed by cervical dislocation and subjected to gross necropsy.

Under the conditions of the study, none of the animals died, there were no signs of systemic toxicity and all animals showed an expected gain in bodyweight. No abnormalities were noted at necropsy.

The acute oral median lethal dose (LD50) of the test material in the Sprague­ Dawley CD strain rat was therefore estimated to be greater than 2000 mg/kg bodyweight.

Justification for classification or non-classification

In accordance with the criteria for classification as defined in Annex I, Regulation (EC) No 1272/2008, the substance does not require classification with respect to acute toxicity via the oral route.