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Toxicological information

Skin irritation / corrosion

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Administrative data

Endpoint:
skin irritation: in vivo
Type of information:
experimental study
Adequacy of study:
key study
Study period:
30 March 2005 and 02 April 2005
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 guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 404 (Acute Dermal Irritation / Corrosion)
Qualifier:
according to
Guideline:
EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion)
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
white powder; stored at room temperature in the dark

Test animals

Species:
rabbit
Strain:
New Zealand White
Details on test animals and environmental conditions:
New Zealand White rabbits were supplied by David Percival Ltd, Moston, Sandbach, Cheshire, UK.; acclimatisation period of at least five days; At the start of the study the animals were in the weight range of 2.0 to 3.5 kg and
were twelve to twenty weeks old. Free access to mains drinking water and food was allowed through out the study. The temperature and relative humidity were set to achieve limits of 19 to 25 C and 30 to 70% respectively. The rate of air exchange was at least 15 changes per hour and the lighting was controlled by a time switch to give 12 hours continuous light and 12 hours of darkness.

Test system

Type of coverage:
semiocclusive
Preparation of test site:
shaved
Vehicle:
other: distilled water
Controls:
yes, concurrent no treatment
Amount / concentration applied:
0.5 g of the test material, moistened with 0.5 ml of distilled water was introduced under 2.5 cm X 2.5 cm cotton gauze patch
Duration of treatment / exposure:
The patch was removed after four hours and any residual material removed from the test area by gentle swabbing with cotton wool soaked in distilled water.
Observation period:
Approximately one hour after removing the patch and 24, 48 and 72 hours later, the test sites were examined for evidence of primary irritation and scored.
Number of animals:
3
Details on study design:
The day before the test the three rabbits were clipped free of fur from the dorsal/flank area and inspected for gross abnormalities of the epidermis. Only animals with an intact healthy epidermis are selected for the study. A suitable site on the back of each rabbit was selected as test site and 0.5 g of test material moistened with 0.5 ml of distilled water was introduced under a 2.5 cm X 2.5 cm cotton gauze patch which was secured in position with surgical tape. The animals were then placed in a corset to avoid the rabbits interfering with the patch and 4 hours later the patch and the corset were removed and residual material removed. After patch removal, the test sites were evaluated after 1 hour, 24, 48, and 72 hours according to the Draize classification scheme for determination of primary irritation index.

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
primary dermal irritation index (PDII)
Basis:
mean
Time point:
other: 24 and 72 hrs
Score:
0
Max. score:
0
Reversibility:
other: no irritation
Irritation parameter:
erythema score
Basis:
mean
Time point:
other: 1, 24,48 and 72 hr
Score:
0
Max. score:
0
Irritation parameter:
edema score
Basis:
mean
Time point:
other: 1, 24, 48 and 72 hrs
Score:
0
Max. score:
0
Irritant / corrosive response data:
The individual scores for erythema/eschar and oedema were all zero for all three animals for the complete 72 hour observation period. No evidence of skin irritation was noted during the study.The Draize classification scheme for determination of primary irritation index was used
Other effects:
No evidence of skin irritation was noted during the study. There were no signs of systemic toxicity

Any other information on results incl. tables

Calculation of Primary Irritation Index and Grading of Irritancy Potential Using the Draize

Scheme: The scores for erythema and oedema at the 24 and 72-hour readings were totalled for the three test

rabbits (12 values) and this total was divided by six to give the primary irritation index of the test

material.

Primary Irritation Index Classification of Irritancy

0                                   Non-irritant

>0 to2                            Mild irritant

>2 to 5                            Moderate irritant

> 5 to 8                           Severe irritant

Applicant's summary and conclusion

Interpretation of results:
not irritating
Conclusions:
The test material produced a primary irritation index of 0.0 and was classified as a non-irritant to rabbit skin according to the Draize classification scheme. No corrosive effects were noted. The test material did not meet the classification as irritant or corrosive according to the EU labelling regulations.