N,N''-(isobutylidene)diurea

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2008

Report date:

2008

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

N,N''-(isobutylidene)diurea

EC Number:

228-055-8

EC Name:

N,N''-(isobutylidene)diurea

Cas Number:

6104-30-9

Molecular formula:

C6H14N4O2

IUPAC Name:

N,N''-(2-methylpropane-1,1-diyl)diurea

Details on test material:

- Name of test material (as cited in study report): Isodur
- Physical state: solid
- Analytical purity: 90.3 %
- Lot/batch No.: 1/08
- Stability under test conditions: The stability of the test substance under storage conditions over the test period was guaranteed by the sponsor, and
the sponsor holds this responsibility.
- Storage condition of test material: Room temperature/ dry storage
- Other:

Test animals

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Wiga GmbH
- Age at study initiation: male animals approx. 8 - 9 weeks, female animals approx. 12 - 13 weeks
- Weight at study initiation: males: 232-255 g; females: 206-224 g
- Housing: individually
- Diet: ad libitum
- Water: ad libitum
- Acclimation period: at least 5 days


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22-26 °C
- Humidity (%): 20-80 %
- Photoperiod (hrs dark / hrs light): 12/12

Administration / exposure

Type of coverage:

semiocclusive

Vehicle:

CMC (carboxymethyl cellulose)

Details on dermal exposure:

TEST SITE
- Area of exposure: About 40 cm² (corresponds to at least 10% of the body surface)
- % coverage: at least 10 % of the body
- Type of wrap if used: semi-occlusive dressing (the bandage consists of four layers absorbent gauze, Ph. Eur. Lohmann GmbH & Co. KG
and Fixomull stretch (adhesive fleece), Beiersdorf AG)


REMOVAL OF TEST SUBSTANCE
- Washing (if done): Rinsing of the application site with warm water.
- Time after start of exposure: after 24 hours of exposure


TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 4 g/kg (50% testsubstance)
- Concentration (if solution): 50 g/100 ml
- Constant volume or concentration used: yes
- For solids, paste formed: yes

Duration of exposure:

24 hours

Doses:

2000 mg/kg

No. of animals per sex per dose:

5

Control animals:

not specified

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Individual body weights shortly before administration (day 0), weekly thereafter and on the last day of observation. Recording of signs and symptoms several times on the day of application, at least once each workday for the individual animals
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight,gross pathology, assessment of the skin reactions

Statistics:

not applicable

Results and discussion

Effect levels

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Mortality:

No mortality occurred

Clinical signs:

other: No systemic clinical observations were observed during clinical examination and no local effects (skin) were observed

Gross pathology:

No macroscopic pathologic findings were noted in the animals (5 males and 5 females) examined on the last day of observation