Ethylene dimethacrylate

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

comparable to guideline study

Remarks:

Pre-guideline study. Test procedure in accordance with generally accepted scientific standards and described in sufficient detail. Comparable to guideline study with acceptable restrictions.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1977

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: "Appraisal of the safety of chemicals in foods, drugs and cosmetics, FDA"

Principles of method if other than guideline:

Method: in accordance with Appraisal of the safety of chemicals in food, drugs and cosmetics, FDA (1959)

GLP compliance:

no

Test type:

standard acute method

Limit test:

no

Test material

Test material information

Constituent 1

Reference substance name:

Ethylene dimethacrylate

EC Number:

202-617-2

EC Name:

Ethylene dimethacrylate

Cas Number:

97-90-5

Molecular formula:

C10H14O4

IUPAC Name:

2-[(2-methylprop-2-enoyl)oxy]ethyl 2-methylprop-2-enoate

Test material form:

liquid

Specific details on test material used for the study:

- Name of test material (as cited in study report): Glykoldimethacrylat
- Substance type: organic
- Physical state: liquid
- Density : 1.055 g/ml (20°C)

Test animals

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: SPF Wistar rats, Zucht Winkelmann, Paderborn, Germany
- Age at study initiation: no data
- Weight at study initiation: 145 - 225 g
- Fasting period before study: 16 hours
- Housing: 5 m, 5 w animals per group
- Diet: ad libitum
- Water: ad libitum
- Acclimation period: no data


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22°C
- Humidity (%): 45 - 55 %
- Air changes (per hr): no data
- Photoperiod (hrs dark / hrs light): 12 hrs dark / 12 hrs light

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

unchanged (no vehicle)

Doses:

7.94, 8.89, 10.00, 11.20, 12.60 ml/kg

No. of animals per sex per dose:

5f/5m per dose

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighting: 20 min, 1h, 3h, 24h, 48h, 7d, 14d
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight, organ weights, histopathology, other: reflexes, emotions, consciousness, central
symptoms, autonomous functions, tone

Results and discussion

Effect levels

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

8 300 mL/kg bw

Based on:

test mat.

95% CL:

>= 7.69 - <= 8.96

Remarks on result:

other: 14 days LD50; equals LD50: 8700 mg/kg with a density of 1.055

Mortality:

In all the dose groups mortalities occurred within 5 days. In the first group 4/10 and second dose group 7/10 animals died, in the third dose group 8/10 and in the fourth and fifths dose group 10/10 animals died after 14 days.

Clinical signs:

other: Dose-dependent effects e.g. decreased activity, distributed coordination, piloerection; in high dose groups: anomalous attitude, tremor; symptoms occurred 20 min after admin. of TS and lasted for 24 h, after that all animals showed normal behaviour.

Any other information on results incl. tables

Table (I) Mortality (mortalities occurred within 5 days p.a.)

group   dose  24 hours (p.a.)  14 days (p.a.)  (I)  7.94 ml/kg  0/10  4/10  (II)  8.89 ml/kg   3/10  7/10  (III)  10.0 ml/kg  6/10  8/10  (IV)  11.20 ml/kg  6/10  10/10  (V)  12.60 ml/kg  8/10  10/10

Table(II) Weight development

group/ number of animals   mean weight (ante application; a.a.)   mean weight (post application; p.a.) after 14days  (I) / 5f, 5m  166.0 g  190.8 g  (II) / 5f, 5m   194.0 g  221.7 g  (III) / 5f, 5m   177.0 g  170.0 g  (IV) / 5f, 5m  178.5 g    -   (V) / 5f, 5m  168.5 g    -

Remark: Except the animals I-9 and III-8 (very haggard animals) all the other test animals showed at the  end of the post exposure period of 14 days normal body weight gain.

Applicant's summary and conclusion

Interpretation of results:

study cannot be used for classification

Remarks:

Migrated information

Conclusions:

According to the test result: LD50(14days) 8700 mg/kg bw the test substance Ethylene glycol dimethacrylate has to be classified as nontoxic in
respect of its acute oral toxicity.

Executive summary:

In an pre-guideline acute oral toxicity study, groups of fasted male and female SPF Wistar rats were given a single oral dose of Ethylene glycol dimethacrylate > 98.5 % at doses of 7.94, 8.89, 10.00, 11.20 and 12.60 ml/kg bw and observed for 14 days.

 

Oral LD₅₀Combined = 8.30 ml/kg bw equals ca. 8700  mg/kg  bw

GHS Category 5 ranges from 2000 -5000 mg/kg bw and represents the lowest hazard category for classifying the acute oral toxicity of a chemical substance. ("Criteria for hazard Category 5 are intended to enable the identification of the test substances which are of relatively low acute toxicity hazard but which, under certain circumstances may present a danger to vulnerable populations". (OECD guideline 425 annex 4)).

    

Ethylene glycol dimethacrylate is of very low oral toxicity based on this LD₅₀ test in males and females.

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