Isocyanic acid, polymethylenepolyphenylene ester, 2-ethyl-1-hexanol-blocked

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

October 26 2006 to January 04 2007

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2007

Report date:

2007

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test type:

acute toxic class method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

1-isocyanato-2-[(4-isocyanatophenyl)methyl]benzene; 1-isocyanato-4-[(4-isocyanatophenyl)methyl]benzene; 2-ethylhexyl N-(4-{[4-({[(2-ethylhexyl)oxy]carbonyl}amino)phenyl]methyl}phenyl)carbamate; 2-ethylhexyl N-{4-[(4-isocyanatophenyl)methyl]phenyl}carbamate

EC Number:

700-674-2

Cas Number:

147993-65-5

Molecular formula:

Unspecified Not applicable, since UVCB

IUPAC Name:

1-isocyanato-2-[(4-isocyanatophenyl)methyl]benzene; 1-isocyanato-4-[(4-isocyanatophenyl)methyl]benzene; 2-ethylhexyl N-(4-{[4-({[(2-ethylhexyl)oxy]carbonyl}amino)phenyl]methyl}phenyl)carbamate; 2-ethylhexyl N-{4-[(4-isocyanatophenyl)methyl]phenyl}carbamate

Test material form:

liquid

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
batch number of test material: LL6-077
- Purity: 100 % (given by sponsor)
Expire date: 2007-01-27

Test animals

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS:
- Source: Harlan-Winkelmann GmbH (Borchen, Germany)
- Age at study initiation: approx. 10-12 weeks
- Weight at study initiation: 176 -188 g
- Fasting period before study: 16-24 hours
- Housing: in groups
- Diet: ad libitum
- Water: ad libitum
- Acclimation period: at least 5 days


ENVIRONMENTAL CONDITIONS:
- Temperature (°C): 22 +/- 2
- Humidity (%): 55 +/- 5
- Air changes (per hr): approx. 10
- Photoperiod (hrs dark / hrs light): 12 / 12

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

other: corn oil with the aid of 10 % acetone (dried with molecular sieve)

Details on oral exposure:

RATIONALE FOR THE SELECTION OF THE STARTING DOSE:
As described in the flow charts of Annex 2, OECD guideline 423, the starting dose level should be that which is most likely to produce mortality in
some of the dosed animals. Therefore, the limit dose 2000 mg/kg bw was chosen as starting dose.

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

6

Control animals:

no

Details on study design:

ADMINISTRATION
- Application volume: 10 ml/kg bw
- Post dose observation period: 14 days

EXAMINATIONS
- Clinical observations were made several times on the day of dosing and at least once a day during the 14 day observation period. Body
weights were recorded immediately prior to dosing and on days 7 and 14. Gross pathological examination was carried out on all animals.

Statistics:

none (limit test)

Results and discussion

Effect levels

Key result

Sex:

female

Dose descriptor:

other: LD50 cut-off

Effect level:

>= 5 000 mg/kg bw

Based on:

test mat.

Mortality:

All 6 animals survived the treatment.

Clinical signs:

other: No clinical signs were observed.

Gross pathology:

No gross pathological findings were observed.

Other findings:

None

Any other information on results incl. tables

NOEL: 2000 mg/kg bw

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

A dose of 2000 mg/kg bw was tolerated by female rats without mortalities, clinical signs, effects on weight gain and gross pathological findings.

Executive summary:

A single oral dose of 2000 mg/kg body weight was tolerated by female rats without mortalities, clinical signs, effects on weight gain and gross pathological findings. According to OECD guideline 423 the LD50 cut-off of Desmodur MT is >= 5000 mg/kg bw. for rats (Category 5 / unclassified of the Globally Harmonized Classification System).