Carbamic acid, N,N'-[1,3-phenylenebis[methyleneiminocarbonylimino(methyl-3,1-phenylene)]]bis-, di-C10-14-alkyl esters

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:

1999

Report date:

1999

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

GLP compliance:

yes (incl. QA statement)

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

-

EC Number:

428-710-1

EC Name:

-

Cas Number:

207574-76-3

Molecular formula:

C46H68N6O6 / C48H72N6O6 / C50H76N6O6 / C52H80N6O6 / C54H84N6O6

IUPAC Name:

Condensation products of m-phenylenebis(methylamine) with condensation products of 4-methyl-m-phenylene diisocyanate with alcohols, C10-14 (even numbered)

Details on test material:

- Physical state: solid
- Analytical purity: >99%

Test animals

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: RCC Ltd, Biotechnology & Animal Breeding Division, Wölferstrasse 4, CH-4414 Füllinsdorf, Switzerland
- Age at study initiation: 9 weeks for males and 12 weeks for femals
- Weight at study initiation: males 224.3 - 238.5 g, females 197.1 - 217.9 g
- Housing: Groups of 5 in Makrolon type-4 cages with standard softwood bedding, during treatment and observation individually in Makrolon type-3 cages with standard softwood bedding
- Diet (e.g. ad libitum): Pelleted standard Kliba 3433 rat maintencance diet, available ad libitum
- Water (e.g. ad libitum): Community tap water from Itingen, available ad libitum.
- Acclimation period: Under laboratory conditions, after health examination. Only animals without any visible signs of illness were used for the study.


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 +/- 3
- Humidity (%): 40 - 70
- Air changes (per hr): 10 - 15
- Photoperiod (hrs dark / hrs light): 12/12, recorded music was played for approx. 8 hours during the light period

Administration / exposure

Type of coverage:

semiocclusive

Vehicle:

unchanged (no vehicle)

Details on dermal exposure:

TEST SITE
- Area of exposure: Approx. 10% of total body surface
- Type of wrap if used: semi occlusive dressing, wrapped around the abdomen and fixed with an elastic adhesive bandage


REMOVAL OF TEST SUBSTANCE
- Washing (if done): flushed with lukewarm tap water and dried with disposable paper towels
- Time after start of exposure: 24 hours


TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 6.0 ml / kg bw
- Concentration (if solution): 2000 mg/kg bw
- Constant volume or concentration used: yes
- For solids, paste formed: no

Duration of exposure:

24h

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

Male: Number of animals: 5
Female: Number of animals: 5

Control animals:

not required

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing:
- Mortality/Viability: Four times during test day 1 (day of administration) and once daily during days 2 to 15
- Body weights: on test day 1 (pre-administration), days 8 and 15
- Clinical sign: Each animal was examined for changes in appearance and behaviour four times during day 1 (day of administration), and once daily during days 2 to 15
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight,organ weights, histopathology

Statistics:

Not applicable. No statistical analysis was used as no deaths occured

Results and discussion

Effect levels

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Mortality:

No deaths occured during the study

Clinical signs:

other: No systemic or local signs of toxicity were observed during the study period

Gross pathology:

No macroscopic findings were observed at necropsy

Applicant's summary and conclusion

Interpretation of results:

other: not classified according to Regulation (EC) 1272/2008.

Conclusions:

As no mortality occured in the acute dermal toxicity test (OECD 402), the LD50 of the test item is > 2000 mg/kg bodyweight. Based on these results and according to the EC criteria for classification and labelling according to GHS/CLP (Regulation (EC) No. 1272/2008), the test item does not have to be classified and has no obligatory labelling requirement for dermal toxicity.

Executive summary:

As no mortality occured in the acute dermal toxicity test (OECD 402), the LD50 of the test item is > 2000 mg/kg boddyweight and therefore the substance is not classified.