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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:
9 August 1990 and 16 August 1990
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: GLP study according to OECD404 used to draw a conclusion on the non corrosive/ non-irritating properties to skin of the tested substance, which differs slightly from registered substance. Compostion of tested substance available from another report.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1990
Report Date:
1990

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 404 (Acute Dermal Irritation / Corrosion)
Version / remarks:
1981
Deviations:
not specified
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent
Type:
Constituent
Type:
additive
Type:
additive
Test material form:
liquid
Details on test material:
Description: dark straw-coloured liquid
Container: plastic screw-top container
Date of arrival: 26 July 1990
Storage conditions: room temperature

Test animals

Species:
rabbit
Strain:
New Zealand White
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: David Percival Ltd.,Moston, Sandbach, Cheshire, u.K
- Age at study initiation: Approx 12-16 weeks old
- Weight at study initiation: 2.20 - 2.35 kg
- Housing: individually in suspended metal cages
- Diet (e.g. ad libitum): ad libitum Rabbit Diet, Preston Farmers Limited, New Leake, Boston, Lincolnshire, U.K
- Water (e.g. ad libitum): ad libitum
- Acclimation period: 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20 -24°C
- Humidity (%): 60 - 69%
- Air changes (per hr): approx. 15
- Photoperiod (hrs dark / hrs light): 12h dark/ 12 h light

Test system

Type of coverage:
semiocclusive
Preparation of test site:
clipped
Vehicle:
unchanged (no vehicle)
Controls:
no
Duration of treatment / exposure:
4 hours
Observation period:
Approximately one hour following the removal of the patches and 24, 48 and 72 hours later
Number of animals:
3
Details on study design:
TEST SITE
- Area of exposure: 2.5 cm x 2.5 cm
- Type of wrap if used: gauze patch soaked with 0.5 ml test substance. The patch was secured in position with a strip of surgical adhesive tape (BLENDERM: 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
- Residual test material removed by gentle swabbing with cotton wool soaked in diethyl ether.
- Time after start of exposure: 4 h

OBSERVATION TIME POINTS
one hour following the removal of the patches and 24, 48 and 72 hours later

SCORING SYSTEM:
- Method of calculation: Draize J.H.(1959) Association of Food and Drug Officials of the United States, Austin, Texas, "The Appraisal of the Safety of Chemicals in Foods, Drugs
and Cosmetics"

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
erythema score
Basis:
animal #1
Time point:
24/48/72 h
Score:
ca. 1.3
Max. score:
2
Reversibility:
fully reversible within: 7 days
Remarks:
after 7 days stil desquamation visible
Remarks on result:
other: Reaction extends beyond treatment site, Desquamation
Remarks:
Hemorrhage of dermal capillaries was observed after 1 h, but dissapeared after 24 h
Irritation parameter:
erythema score
Basis:
animal #2
Time point:
24/48/72 h
Score:
ca. 1
Max. score:
1
Reversibility:
fully reversible within: 7 Days
Remarks:
after 7 days stil desquamation visible
Remarks on result:
other: Reaction extemds beyond treatmetn site. Desquamation
Irritation parameter:
erythema score
Basis:
animal #3
Time point:
24/48/72 h
Score:
ca. 1
Max. score:
1
Reversibility:
fully reversible within: 7 days
Remarks on result:
other: Reaction extends beyond treatmetn site, Desquamation
Irritation parameter:
edema score
Basis:
animal #1
Time point:
24/48/72 h
Score:
ca. 0.7
Max. score:
1
Reversibility:
fully reversible within: 72 h
Irritation parameter:
edema score
Basis:
animal #2
Time point:
24/48/72 h
Score:
ca. 0.3
Max. score:
1
Reversibility:
fully reversible within: 48 h
Irritation parameter:
edema score
Basis:
animal #3
Time point:
24/48/72 h
Score:
ca. 0.3
Max. score:
1
Reversibility:
fully reversible within: 48 h
Irritant / corrosive response data:
To evaluate the classification of the substances according to CLP Regulation, the raw data was reinterpreted.
The mean value from gradings at 24, 48 and 72 hours after patch removal calculated in at least 2 of 3 tested animals were the following:
- erythema/eschar: score 7/6=1.17 (2 out of 3 animals)
- oedema: 3/6=0.5 (2 out of 3 animals)

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
The results of the available OECD 404 study shows that the test item Reaction mass of N-butylphthalimide and N-sec-butylphthalimide and N-propylphthalimide is not corrosive and not irritating to skin according to the regulation 1272/2008/EC after reinterpretation of the raw data.

Executive summary:

A study was performed to assess the irritancy potential of the test material Reaction mass of N-butylphthalimide and N-sec-butylphthalimide and N-propylphthalimide to the skin of the New Zealand white rabbit. The method used followed that described in the OECD Guidelines for Testing of chemicals(1981) No' 404 "Acute Dermal Irritation/Corrosion" referenced as Method 84 in commission Directive 84/449/EEC. The results may be used as a basis for classification and labelling according to the Regulation 1272/2008/EC after reinterpretation of the raw data.

A single 4-hour, semi-occluded application of the test material to the intact skin of three rabbits produced very slight to well-defined erythema and very slight to slight oedema.

The mean value from gradings at 24, 48 and 72 hours after patch removal calculated were the following:

- erythema/eschar: score 7/6=1.17 (2 out of 3 animals)

- oedema: 3/6=0.5 (2 out of 3 animals)

Incidents of desquamation and haemorrhage of the dermal capillaries were also noted. On occasions the reactions extended beyond the treatment sites. No corrosive effects were noted.

The test material is not corrosive and not irritant to skin according to the regulation 1272/2008/EC.