1,4-dithiane-2,5-diol

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2004-07-06 to 2004-07-18

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2005

Report date:

2005

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Version / remarks:

adopted 24 April 2002

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion)

Version / remarks:

30 May 2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

1,4-dithiane-2,5-diol

EC Number:

254-751-6

EC Name:

1,4-dithiane-2,5-diol

Cas Number:

40018-26-6

Molecular formula:

C4H8O2S2

IUPAC Name:

1,4-dithiane-2,5-diol

Test material form:

solid: particulate/powder

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Age at study initiation: 12-20 weeks
- Weight at study initiation: 2.0-3.5 kg
- Housing: individually housed in suspended metal cages
- Diet (e.g. ad libitum): ad libitum, (Certified Rabbit Diet (Code 5322) supplied by BCM IPS Limited, London, UK)
- Water (e.g. ad libitum): ad libitum
- Acclimation period: at least five days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 17-23
- Humidity (%): 30-70
- Air changes (per hr): 15
- Photoperiod (hrs dark / hrs light): 12/12

Test system

Type of coverage:

semiocclusive

Preparation of test site:

clipped

Vehicle:

other: moistened with distilled water

Controls:

no

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.5 g

Duration of treatment / exposure:

In the first animal: 3 min, 1h and 4h, after consideration of the reactions in the first animal two other animals were treated for 4h.

Observation period:

72 h
Reading time points: 1, 24, 48 and 72 h

Number of animals:

3

Details on study design:

TEST SITE
- Area of exposure: 2.5 x 2.5 cm
- Type of wrap if used: a 2.5 cm x 2.5 cm cotton gauze patch secured in position with a strip of surgical adhesive tape. To prevent the animal interfering with the patches, the trunk of the rabbit was wrapped in an elasticated corset and the animal was returned to its cage for the duration of the exposure period.

REMOVAL OF TEST SUBSTANCE
- Washing (if done): Any residual test material was removed by gentle swabbing with cotton wool soaked in distilled water.
- Time after start of exposure: 3 min, 1h and 4 h (animals 1), 4h (animals 2 and 3)

OBSERVATION TIME POINTS
(indicate if minutes, hours or days)
24, 48 and 72h

SCORING SYSTEM:
- Method of calculation: according to OECD guideline 404 (Draize scoring system)

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

animal: #1-#3

Time point:

24/48/72 h

Score:

0

Max. score:

4

Remarks on result:

no indication of irritation

Results 2

Irritation parameter:

edema score

Basis:

animal: #1-#3

Time point:

24/48/72 h

Score:

0

Max. score:

4

Remarks on result:

no indication of irritation

Irritant / corrosive response data:

No evidence of skin iriitation was noted during the study.

Any other information on results incl. tables

Table 1: Irritant/corrosive response data for each animal at each observation time up to removal of each animal from the test

Score at time point / Reversibility	Erythema	Edema
	Max. score: 4	Max. score: 2
24 h	0/0/0	0/0/0
48 h	0/0/0	0/0/0
72 h	0/0/0	0/0/0
Average 24h, 48h, 72h	0/0/0	0/0/0
Reversibility*)	c.	c.
Average time (unit) for reversion	no indication for irritation	no indication for irritation

*) Reversibility: c. = completely reversible; n.c. = not completely reversible; n. = not reversible

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

In the present study conducted according to OECD guideline 404 (24 April 2004), three New Zealand White rabbits were dermally exposed to the test item for 4h under occlusive conditions. No signs were detected at any of the observation time points, i.e. 24, 48 and 72h. Based on these results the substance does not need to be classified according to Regulation (EC) No 1272/2008 (CLP) and the Globally Harmonized System for Classification and Labelling of Chemicals (GHS) with respect to skin irritation/corrosion.