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Diss Factsheets

Toxicological information

Skin irritation / corrosion

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Administrative data

skin irritation: in vivo
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Experiment start date - 12 June 2003; Experiment end date - 02 July 2003; Study completion date - 05 August 2003.
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference Type:
study report
Report date:

Materials and methods

Test guidelineopen allclose all
according to guideline
OECD Guideline 404 (Acute Dermal Irritation / Corrosion)
according to guideline
EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion)
GLP compliance:
yes (incl. QA statement)

Test material

Constituent 1
Test material form:
solid: particulate/powder
migrated information: powder
Details on test material:
- Name of test material (as cited in study report): FAT 40'812/A
- Purity: Approx. 75%
- Lot/batch No.: WP 3/03
- Expiration date: 23 April 2010
- Stability: Stable under storage conditions
- Storage conditions: At room temperature (range of 20 ± 3 °C), away from direct sunlight
Specific details on test material used for the study:
Identity: FAT 40812/A
Batch: WP 8/03
Purity: approx. 75 %
Appearance: Solid, dark red-brownish powder
Expiration date: 23 April 2010
Storage: At room temperature at about 20 °C

Test animals

New Zealand White
Details on test animals or test system and environmental conditions:
- Source: Elevage Scientifique des Dombes, F-01400 Chatillon sur Chalaronne / France
- Age at treatment: 14-15 weeks (male), 13-14 weeks (female)
- Body weight at treatment: 2745 - 3124 g
- Housing: Individually in stainless steel cages equipped with feed hoppers and drinking water bowls. Wood blocks (RCC Ltd, Füllinsdorf) and haysticks 4646 (batch no. 0301, Provimi Kliba AG) were provided for gnawing.
- Diet: Pelleted standard Provimi Kliba 3418 rabbit maintenance diet ad libitum (batch no. 28/03) provided by Provimi Kliba AG, CH-4303 Kaiseraugst.
- Water: Community tap water from Füllinsdorf, ad libitum.
- Acclimation period: Under laboratory conditions after health examination. Only animals without any visual signs of illness were used for the study.

- Temperature (°C): 17 - 23
- Humidity (%): 30 - 70
- Air changes (per hr): 10 - 15
- Photoperiod (hrs dark / hrs light): 12/12

Room temperature and humidity were monitored continuously and values outside of these ranges may have occasionally occurred, usually following room cleaning. These transient variations are considered not to have any influence on the study and, therefore, these data are not reported but are retained at RCC.

Test system

Type of coverage:
Preparation of test site:
Amount / concentration applied:
0.5 g test substance moistened with approximately 0.1 mL purified water.
Duration of treatment / exposure:
4 hours
Observation period:
14 days
Number of animals:
1 male, 2 females
Details on study design:
Four days before treatment, the left flank was clipped with an electric clipper, exposing an area of approximately 100 cm² (10 cm x 10 cm). The skin of the animals was examined one day before treatment, and regrown fur of all animals was clipped again. Animals with overt signs of skin injury or marked irritation which may have interfered with the interpretation of the results were not used in the test. On the day of treatment, 0.5 g of FAT 40812/A was placed on a surgical gauze patch (ca. 4 cm x 4 cm). This gauze patch was applied to the intact skin of the clipped area. The patch was covered with a semi-occlusive dressing. The dressing was wrapped around the abdomen and anchored with tape. The duration of treatment was 4 hours. Then the dressing was removed and the skin was flushed with lukewarm tap water to clean the application site.

Viability/Mortality: Daily from acclimatization of the animals to the termination of test.
Clinical signs: Daily from acclimatization of the animals to the termination of test.
Body weights: At start of acclimatization, on the day of application and at termination of observation.

The skin reaction was assessed according to the numerical scoring system listed in the EEC Commission Directive 92/96/EEC, July 31, 1992 approximately 1, 24, 48 and 72 hours, as well as 7, 10 and 14 days after the removal of the dressing, gauze patch and test item. To allow further examination of the test sites all animals were re-clipped on completion of the 48 hour and 7-day examination. If evident, corrosive or staining properties of the test item were described and recorded.

Evaluation of Skin Reactions

Erythema and Eschar Formation
No erythema 0
Very slight erythema (barely perceptible) 1
Well defined erythema 2
Moderate to severe erythema 3
Severe erythema (beet redness) to slight eschar formation (injuries in depth) 4

Edema Formation
No edema 0
Very slight edema (barely perceptible) 1
Slight edema (edges of area well defined by definite raising 2
Moderate edema (raised approximately 1 mm) 3
Severe edema (raised more than 1 mm and extending beyond area of exposure) 4

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
erythema score
Time point:
24/48/72 h
Max. score:
Remarks on result:
no indication of irritation
Irritation parameter:
edema score
Time point:
24/48/72 h
Max. score:
Remarks on result:
no indication of irritation
Irritant / corrosive response data:
- With the exception of the red staining, the test item did not elicit any skin reactions at the application site of any animal at any of the observation times.
- Neither alterations of the treated skin were observed nor were corrosive effects evident on the skin.
Other effects:
- Slight to marked red staining of the treated skin produced by the test item was observed in all animals from the 1-hour to the 72-hour reading after treatment. Slight red staining was still visible in all animals up to 10 days after treatment.
- No clinical signs of systemic toxicity were observed in the animals during the study and no mortality occurred.
- The body weights of all rabbits were considered to be within the normal range of variability.

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Test substance is considered to be not irritating to the rabbit skin.
Executive summary:

In a GLP-compliant skin irritation study, performed according to OECD guideline 404, the test substance (moistened, 0.5 g) was applied, semi-occlusive, to the skin of three New Zealand White rabbits for 4 hours. After 4 hours, the dressing was removed and the skin was flushed with lukewarm tap water and observations were made for an additional 14 days. The test substance showed an edema and erythema score of 0 during the whole observation period. Slight red staining was observed on all animals up to 10 days after treatment. No corrosive effects were noted. Also no other clinical signs of test item related effects were observed. Under the conditions of this experiment, the test substance was found to be not irritating to rabbit skin.