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Administrative data

skin irritation: in vivo
Type of information:
experimental study
Adequacy of study:
key study
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP compliant guideline study, available as unpublished report, no restrictions, fully adequate for assessment.

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)
RCC Ltd, 4452 Itingen, Switzerland

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 40826/A
- Lot/batch No.: TZ 5604 BOP 01/06
- Expiration date: 1 February 2011
- Purity: Content of organic part (Na-salt): approx. 78%. Oligomers: 13%. Main component: approx. 48%.
- Stability of test item: Stable under storage conditions
- Storage conditions: At room temperature (range of 20 ± 5 °C) in a exsiccator.

Test animals

New Zealand White
Details on test animals or test system and environmental conditions:
- Source: Harlan France, Zl Le Marcourlet, 03800 Gannat/France
- Age at treatment: 12-13 weeks
- Housing: Individually in stainless steel cages equipped with feed hoppers and drinking water bowls. Wood blocks (RCC Ltd, Füllinsdorf) and haysticks 4642 (batch no. 77/05, Provimi Kliba AG) were provided for gnawing.
- Diet: Pelleted standard Provimi Kliba 3418 rabbit maintenance diet ad libitum (batch no. 24/06) 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 0.5 mL purified water.
Duration of treatment / exposure:
4 hours
Observation period:
7 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 40826/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 Commission Directive 2004/73/EC, April 29, 2004 approximately 1, 24, 48 and 72 hours, as well as 7 days after the removal of the dressing, gauze patch and test item.

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
erythema score
Time point:
other: 1, 24, 48, 72 hours and 7 days
Max. score:
Irritation parameter:
edema score
Time point:
other: 1, 24, 48, 72 hours and 7 days
Max. score:
Irritant / corrosive response data:
- The test item did not elicit any skin reactions at the application site of any animal of the observation times (all scores 0). The individual mean score for erythema/eschar and oedema for each of the three animals was therefore 0.
- Neither alterations of the treated skin were observed nor were corrosive effects evident on the skin.
Other effects:
- Slight orange staining of the treated skin produced by the test item was observed in all animals from the 1- to the 48-hour reading and persisted in two animals until the 72-hour reading.
- No clinical signs of systemic toxicity were observed in the animals during the study and no mortality occurred.
- A slight loss of weight (1.7%) was noted during the acclimatization period in one animal. The animal recovered at the end of the observation period. The body weights of the other rabbits were considered to be within the normal range of variability.

Applicant's summary and conclusion

Interpretation of results:
not irritating
Migrated information Criteria used for interpretation of results: EU
Test substance is considered to be not irritating or corrosive 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 7 days. The test substance showed an erythema and edema score of 0 during the whole observation period. Slight orange discoloration of the treated skin area produced by the test item was noted in all animals. 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 or corrosive.