Calcium acetylide

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2004-01-13 to 2004-02-03

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2004

Report date:

2004

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Version / remarks:

adopted 2002-04-24

Deviations:

yes

Remarks:

see "rationale for reliability"

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2003-06-04

Test material

Test material information

Constituent 1

Reference substance name:

Calcium dihydroxide

EC Number:

215-137-3

EC Name:

Calcium dihydroxide

Cas Number:

1305-62-0

Molecular formula:

CaH2O2

IUPAC Name:

calcium dihydroxide

Constituent 2

Reference substance name:

Calciumdihydroxid

IUPAC Name:

Calciumdihydroxid

Test material form:

semi-solid (amorphous): gel

Remarks:

migrated information: paste

Details on test material:

- Name of test material (as cited in study report): Calcium hydroxide (hydrated lime) in putty form (60 % H2O, 40 % Ca(OH)2)
(from K. Raikos S.S., 6 Chris Smirnhs Str. PEFKI, Athens, Greece.
- Physical state: White paste (about 1300 kg/m³)
- Analytical purity: Ca(OH)2 +Mg(OH)2 ≥ 97 %
- Batch No.: Sample from the production of 10/12/2003 (The test item was labelled with the Lab. No. 02407 for this study.)
- Storage condition of test material: Room temperature
No further information on the test material was stated.

Test animals

Species:

rabbit

Strain:

Himalayan

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: DIMED Schönwalde GmbH, 16352 Schönwalde
- Age at study initiation: approx. 11 to 17 months
- Weight at study initiation: 2.6-2.9 kg b.w.
- Housing: The rabbits were caged individually in PPO cages (floor area: 2576 cm²) with perforated floor.
- Diet (ad libitum): A pelleted complete rabbit diet "Alromin 2123" from Altromin, D-32791 Lage, Lippe.
- Water (ad libitum): Domestic quality drinking water acidified with hydrochloric acid to pH 2.5 in order to prevent microbial
growth
- Acclimation period: at least one week
ENVIRONMENTAL CONDITIONS
- Temperature: 20 °C +/- 3 °C
- Relative humidity: 55 % +/- 15 %
- Air changes: 10 times/hour
- Photoperiod (hrs dark / hrs light): 12/12
No further information on the test animals was stated.

Test system

Vehicle:

unchanged (no vehicle)

Controls:

not specified

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.5 g of the test item
No further information on the test item was stated.

Duration of treatment / exposure:

Initial test (one rabbit): 3 minutes, 1hour and 4 hours
Confirmatory test (2 rabbits): 4 hours

Observation period:

Immediately and 1 h, 24 h, 48 h, 72 h as well as on day 7 and 14 after termination of exposure

Number of animals:

3 rabbits

Details on study design:

Initial test:
On the experimental day one rabbit was physically restrained on a test table and its back was divided into six test fields. The
left side of the body served as the test area for the test item. The test item was applied to a 16-layer gauze patch (2.5 X 2.5
cm), the patch was placed on the appropriate anterior test field and secured with adhesive Gothaplast tape (2.5 cm). After an
exposure time of 3 min, the first patch was removed. Since no corrosive effects were observed a second patch with the test
item was applied on the median test field of the rabbit back. In order to improve the patch securing the trunk of the animal was
additionally wound with 5 cm wide adhesive Gothaplast tape. After 1 h the second patch was removed. Also, after 1 h no
corrosive effects were observed so that the exposure time could be extended to 4 hours. The test item was applied on a third
patch and put on the posterior test field of the animal. Adhesive Gothaplast tape (2.5 cm X 5 cm wide) served again as
securing. After a 4-hour exposure time the third patch was removed.
Since the animal did not show any corrosive effect within a seven day observation period it was decided to carry out a
confirmatory test with two additional animals.
Confirmatory test:
Likewise for the confirmatory test the animals were physically restrained on a test table and the back of each rabbit was
divided in four test fields. Always the anterior left field was selected as the test area for the test item.
The test item was applied on a 16-layer gauze patch (2.5 cm X 2.5 cm) and the patch was placed on the appropriate test field.
The gauze patch was secured with adhesive Gothsplast tape (2.5 cm wide) and fixed with Gothaplast tape (5 cm wide) loosely
wound round the trunk of the animals.
TEST SITE
- Area of exposure: The day before the treatment the rabbits were weighed and the skin area on the back was clipped as
closely as possible with an electric clipper.

REMOVAL OF TEST SUBSTANCE
- Washing: The treated skin was cleaned with mild soap and lukewarm water
- Time after start of exposure: Immediately
SCORING SYSTEM: Draize scoring system
No further information on the study design was stated.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

mean

Remarks:

animal #1

Time point:

24/48/72 h

Score:

2

Max. score:

2

Reversibility:

fully reversible

Remarks on result:

other: Average scores recorded after 24, 48 and 72 hours after a 4-hour application.

Results 2

Irritation parameter:

edema score

Basis:

mean

Remarks:

animal #1

Time point:

24/48/72 h

Score:

0

Max. score:

0

Reversibility:

fully reversible

Remarks on result:

other: Average scores recorded after 24, 48 and 72 hours after a 4-hour application.

Results 3

Irritation parameter:

erythema score

Basis:

mean

Remarks:

animal #2

Time point:

24/48/72 h

Score:

0

Max. score:

0

Reversibility:

fully reversible

Remarks on result:

other: Average scores recorded after 24, 48 and 72 hours after a 4-hour application.

Results 4

Irritation parameter:

edema score

Basis:

mean

Remarks:

animal #2

Time point:

24/48/72 h

Score:

0

Max. score:

0

Reversibility:

fully reversible

Remarks on result:

other: Average scores recorded after 24, 48 and 72 hours after a 4-hour application.

Results 5

Irritation parameter:

erythema score

Basis:

mean

Remarks:

animal #3

Time point:

24/48/72 h

Score:

2

Max. score:

2

Reversibility:

fully reversible

Remarks on result:

other: Average scores recorded after 24, 48 and 72 hours after a 4-hour application.

Results 6

Irritation parameter:

edema score

Basis:

mean

Remarks:

animal #3

Time point:

24/48/72 h

Score:

1

Max. score:

1

Reversibility:

fully reversible

Remarks on result:

other: Average scores recorded after 24, 48 and 72 hours after a 4-hour application.

Irritant / corrosive response data:

After a maximum 4-hour exposure of calcium hydroxide (hydrated lime) in putty form (60 % H2O, 40 % Ca(OH)2) to the skin of
the three test animals (Nos. 2692, 2632 and 2616) no skin corrosion but the following symptoms of irritation were observed
during the subsequent 14-day observation period.
The animal No. 2692 used in the initial test showed a very slight erythema on the middle (1 h exposure period) and posterior
(4 h exposure period) left test field immediately after the application.
1 h after termination of exposure a well defined erythema was observed on the posterior (4 h exposure period) left test field of
the animal No. 2692 used in the initial test. Animal No. 2616 showed very slight erythema on the anterior left test field,
whereas no skin reaction was observed at the remaining animal No. 2632.
24 and 48 h after termination of exposure the animal No. 2692 used in the initial test showed a well defined erythema on the
middle (1 h exposure period) and posterior (4 h exposure period) left test field. A well defined erythema and a very slight
oedema were oberved on the anterior left test field of another animal No. 2632. The remaining animal No. 2616 showed no
signs of skin irritation.
72 h after termination of exposure a very slight erythema was observed on the middle (1 h. exposure period) left test field of
the animal No. 2692 used in the initial test and a well defined erythema on the posterior left test field. Another animal No. 2632
showed a well defined erythema and a very slight oedema on the anterior left test field, whereas no skin reactions were
observed at the remaining animal No. 2616.
7 days after termination of exposure animal No. 2632 showed a well defined erythema on the anterior left test field. The animal
No. 2692 used in the initial test was free of any skin reactions, whereas on day 6 a very slight erythema was still observed on
the middle (1 h exposure period) and posterior (4 h exposure period) left test field. The remaining animal No. 2616 did not
show any signs of skin irritation, too.
14 days after the termination of exposure animal No. 2632 was also free of any skin reactions.

Applicant's summary and conclusion

Interpretation of results:

Category 2 (irritant) based on GHS criteria

Conclusions:

Based on the results of the study described in this report and according to the EC Regulation No. 1272/2008 and subsequent
regulations, calcium hydroxide (hydrated lime) in putty form (60 % H2O, 40 % Ca(OH)2), shall be classified as irritating.

Executive summary:

In a primary dermal irritation study performed according to OECD TG 404, 3 Himalayan rabbits were dermally exposed to 0.5g of calcium hydroxide (unchanged) for 3 minutes, 1 hour and 4 hours to an area of 2.5cm x 2.5cm. Animals were then observed for 14 days. Irritation was scored by the method of Draize.

After a maximum 4-hour exposure to the test item, no skin corrosion was observed. However, there were signs of irritation indicated by erythema and slight edema formation, which subsided after 7 and 14 days of observation.

Signs of skin irritation were fully reversible until the end of the observation period.

In this study, calcium hydroxide (hydrated lime) is a dermal irritant. According to the criteria set out in Regulation (EC) No. 1272/2008, classification of calcium hydroxide as Skin Irrit. 2 is warranted.