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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:
08 to 22 September 1999
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study was conducted in a GLP compliant laboratory according to accepted regulatory guidelines

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1999
Report Date:
1999

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 404 (Acute Dermal Irritation / Corrosion)
Version / remarks:
1992
Deviations:
no
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
semi-solid (amorphous): gel
Remarks:
migrated information: paste
Details on test material:
- Name of test material (as cited in study report): S-900
- Physical state: dark brown paste
- Lot/batch No.: 02869
- Storage condition of test material:room temperature In the dark, handled under non-actinic lighting only
- Other:

Test animals

Species:
rabbit
Strain:
New Zealand White
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: reputable commercial supplier
- Age at study initiation: 12-16 weeks
- Weight at study initiation: 2.63 - 2.89kg
- Housing: The animals were individually housed in suspended metal cages
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: 5 days minimum

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

IN-LIFE DATES: From: To: 08-22 September 1999

Test system

Type of coverage:
semiocclusive
Preparation of test site:
clipped
Vehicle:
unchanged (no vehicle)
Remarks:
None
Controls:
no
Amount / concentration applied:
500 mg
Duration of treatment / exposure:
4 h
Observation period:
72h - Approximately one hour following the removal of the patches, and 24, 48 and 72 hours later, the test sites were examined for evidence of primary irritation
Number of animals:
3
Details on study design:
TEST SITE
- Area of exposure: dorsal flank area
- % coverage: not specified - area of 2.5cm x 2.5cm tested
- Type of wrap if used:A quantity of 0.5 ml of the test material was introduced under a 2.5 cm x 2.5 cm cotton gauze patch and placed in position on the shorn skin. The patch was secured in position with a strip of surgical adhesive tape (BLEN DERM: approximate size 2.5 cm x 4.0 cm). To prevent the animals interfering with the patches, the trunk of each rabbit was wrapped in an elasticated corset (TUBIGRIP)

REMOVAL OF TEST SUBSTANCE
- Washing (if done): any residual test material removed by gentle swabbing with cotton wool soaked in acetone.
- Time after start of exposure: 4h

SCORING SYSTEM:
The test sites were scored according to the following scale from Draize J H, (1977) "Dermal and Eye Toxicity Tests" In: Principles and Procedures for Evaluating the Toxicity of Household Substances, National Academy of Sciences, Washington DC p.31.

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
erythema score
Basis:
animal #1
Time point:
24/48/72 h
Score:
2
Max. score:
2
Reversibility:
other: moderate desquamation on Day 14
Irritation parameter:
erythema score
Basis:
animal #2
Time point:
24/48/72 h
Score:
2
Max. score:
2
Reversibility:
other: moderate desquamation on Day 14
Irritation parameter:
erythema score
Basis:
animal #3
Time point:
24/48/72 h
Score:
1.66
Max. score:
2
Reversibility:
other: moderate desquamation on Day 14
Irritation parameter:
erythema score
Basis:
animal #1
Time point:
24/48/72 h
Score:
2
Max. score:
2
Reversibility:
fully reversible
Irritation parameter:
edema score
Basis:
animal #2
Time point:
24/48/72 h
Score:
1.66
Max. score:
2
Reversibility:
fully reversible
Irritation parameter:
edema score
Basis:
animal #3
Time point:
24/48/72 h
Score:
0.66
Max. score:
1
Reversibility:
fully reversible
Irritant / corrosive response data:
Reversibility of any observed effect: Changes not fully reversible within 14 days
Other effects:
Crust formation which prevented accurate evaluation of erythema and oedema was noted at all treated skin sites at the 7-day observation. Moderate desquamation was noted at all treated skin sites at the 14-day observation.

Applicant's summary and conclusion

Interpretation of results:
Category 2 (irritant) based on GHS criteria
Conclusions:
The test material, S-900, produced a primary irritation. index of 3.2 and was classified as a MODERATE IRRITANT to rabbit skin according to the Draize classification scheme. No corrosive effects were noted.
The test material produced positive criteria in 2/3 rabbits according to the EU labelling regulations and was classified as IRRITANT to rabbit skin.