4,4a,5,9b-tetrahydroindeno[1,2-d]-1,3-dioxin

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Study period:

9 - 23 Sept 1999

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

No analytical purity of the test substance given.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1999

Report date:

1999

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Version / remarks:

adopted 24 February 1987

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.3 (Acute Toxicity (Dermal))

Version / remarks:

Commission Directive 92/69/EEC

Deviations:

no

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

4,4a,5,9b-tetrahydroindeno[1,2-d]-1,3-dioxin

EC Number:

241-997-4

EC Name:

4,4a,5,9b-tetrahydroindeno[1,2-d]-1,3-dioxin

Cas Number:

18096-62-3

Molecular formula:

C11H12O2

IUPAC Name:

2H,4H,4aH,5H,9bH-indeno[1,2-d][1,3]dioxine

Test animals

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Age at study initiation: 8 - 12 weeks
- Weight at study initiation: males: 229 - 240 g; females: 202 - 227 g
- Housing: individually during the 24-hour exposure period and in groups of 5, by sex, for the remainder of the study in suspended polypropylene cages furnished with woodflakes
- Diet: Rat and Mouse Expanded Diet No. 1, Special Diets Services Limited, Witham, Essex, UK, ad libitum
- Water: mains drinking water, ad libitum
- Acclimation period: minimum 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19 - 25
- Humidity (%): 30 - 70
- Air changes (per hr): 15
- Photoperiod (hrs dark / hrs light): 12 / 12

Administration / exposure

Type of coverage:

semiocclusive

Vehicle:

other: substance was moistened with distilled water

Details on dermal exposure:

TEST SITE
- Area of exposure: clipped back and flanks
- % coverage: 10% of the total body surface area
- Type of wrap if used: A piece of surgical gauze was placed over the treatment area and semi-occluded with a piece of self-adhesive bandage.

REMOVAL OF TEST SUBSTANCE
- Washing: The treated skin and surrounding hair was wiped with cotton wool moistened with distilled water to remove any residual test material.
- Time after start of exposure: 24 hours

Duration of exposure:

24 hours

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

5

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 h after dosing and subsequently once daily for 14 days. Individual bodyweights were recorded prior to application of the test substance on Day 0 and on Days 7 and 14.
after removal of the dressing and subsequently once daily for fourteen days for observations
- Necropsy of survivors performed: yes
- Other examinations performed: After removal of the dressings and subsequently once daily for 14 days, the test sites were examined of primary irritation and scored according to Draize.

Results and discussion

Effect levels

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No deaths were noted until the end of the observation period.

Clinical signs:

other: No signs of systemic toxicity were noted until the end of the 14-day observation period.

Gross pathology:

No abnormalities were noted at necropsy.

Other findings:

No signs of skin irritation were noted.

Applicant's summary and conclusion

Interpretation of results:

other: CLP/EU GHS criteria not met, no classification required according to Regulation (EC) No 1272/2008

Conclusions:

In this acute dermal toxicity study in rats a LD50 value of > 2000 mg/kg bw was found.