Neodecanoic acid, cobalt salt

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2013-11-12 to 2013-11-19

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

The following deviations from the guideline OECD 404 (2002) occured, but they had no effect on the results of the study: - the animals were observed 4.5 hours after the removal of the test item instead of 60 minutes after test item removal - the animals were not observed for systemic adverse effects, but only for the skin irritation listed in the Draize scoring system

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Version / remarks:

2002-04-24

Deviations:

yes

Remarks:

please refer to "Rationale for reliability incl. deficiencies" above

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Neodecanoic acid, cobalt salt

EC Number:

248-373-0

EC Name:

Neodecanoic acid, cobalt salt

Cas Number:

27253-31-2

Molecular formula:

Molecular and structural formula as well as molecular weight are not applicable to a UVCB substance.

IUPAC Name:

λ²-cobalt(2+) bis(2,2-dimethyloctanoate)

Test material form:

semi-solid (amorphous): gel

Remarks:

migrated information: paste

Details on test material:

- Name of test material (as cited in study report): Neodecanoic Acid, Cobalt Salt
- Physical state: thick blue gel/paste
- Stability under test conditions: stable under the conditions of the test protocol (private communication sponsor)

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Kuiper Rabbitry, Gary, Indiana
- Age at study initiation: approximately ten to twelve weeks old
- Weight at study initiation: 2.45 to 2.67 kg
- Housing: the rabbits were individually housed in stainless steel cages.
- Diet (ad libitum): Purina Laboratory Rabbit Chow
- Water (ad libitum)
- Acclimation period: at least five days

ENVIRONMENTAL CONDITIONS
- Temperature: 20 ± 3° C
- Humidity: 30-70%
- Photoperiod (hrs dark / hrs light): 12/12

Test system

Type of coverage:

semiocclusive

Preparation of test site:

clipped

Vehicle:

unchanged (no vehicle)

Controls:

no

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.5 mL aliquot of the test material

Duration of treatment / exposure:

4 hours

Observation period:

approximately 4.5, 24, 48, 72 and 168 hours after treatment

Number of animals:

3 male rabbits

Details on study design:

TEST SITE
- Area of exposure: the day before study initiation, electric clippers were used to remove the hair from the left side of the trunk, from the midline of the back to the abdomen. The following day an aliquot of the test material was then applied to an area approximately 6 square centimeters on the side of the test animal. The application site is located approximately 5-7 centimeters down from the backbone.
- Type of wrap if used: the test substance was then covered with a 2.5 cm² - 2 layer gauze patch held in place with non-irritating Kendall Curity Standard Porous Tape and the patch was then covered with a semi-occlusive plastic overwrap secured in place with Kendall Curity Standard Porous Tape for the duration of the exposure period.

REMOVAL OF TEST SUBSTANCE
- Time after start of exposure: at the end of the 4 hour contact period, excess material was removed from the site; the site being observed and scored.

SCORING SYSTEM: according to the Draize scale

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

mean

Remarks:

animal #1

Time point:

24/48/72 h

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 168 hours

Results 2

Irritation parameter:

edema score

Basis:

mean

Remarks:

animal #1

Time point:

24/48/72 h

Score:

0.67

Max. score:

4

Reversibility:

fully reversible within: 72 hours

Results 3

Irritation parameter:

erythema score

Basis:

mean

Remarks:

animal #2

Time point:

24/48/72 h

Score:

2

Max. score:

4

Reversibility:

fully reversible within: 168 hours

Results 4

Irritation parameter:

edema score

Basis:

mean

Remarks:

animal #2

Time point:

24/48/72 h

Score:

0.67

Max. score:

4

Reversibility:

fully reversible within: 72 hours

Results 5

Irritation parameter:

erythema score

Basis:

mean

Remarks:

animal #3

Time point:

24/48/72 h

Score:

1.33

Max. score:

4

Reversibility:

fully reversible within: 168 hours

Results 6

Irritation parameter:

edema score

Basis:

mean

Remarks:

animal #3

Time point:

24/48/72 h

Score:

0.67

Max. score:

4

Reversibility:

fully reversible within: 72 hours

Irritant / corrosive response data:

There were moderate skin irritation reactions in all of the test subjects, which cleared by the 168 hour observation.
4.5 hour observation: test article adhered to skin & extremely difficult to remove.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The test item is not a skin irritant.
According to the EC-Regulation 1272/2008 and subsequent regulations, the test item is not classified as skin irritant