Reaction mass of Limestone and dicalcium silicate

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

migrated information: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

Minor deviations with no effect on the results: - Stability was not given - Animal weights at conclusion of test were missing According to Annexes VII and VIII, point 8.1.1 of Regulation No 1907/2006 information on skin irritation (in vitro or in vivo) of substances shall be provided. Column 2 of Annex VII states that in vitro tests for skin corrosion or skin irritation need not be conducted if the criteria for classification as irritating to the eyes are met. In addition, Annex XI specifies rules for adaptation of the standard testing requirements. Point 1.5 of Annex XI permits read-across from substances showing similarities based on, amongst others, common functional groups. This read-across concept is applicable to "Reaction mass of limestone and dicalcium silicate". When administered to the skin for testing irritating properties (moistened with water, according to the test guideline EC B.4), calcium hydroxide, constituent of "Reaction mass of limestone and dicalcium silicate”, dissociates into calcium- and hydroxyl ions in aqueous solutions, whereas calcium carbonate and silicate remain largely undissolved and are therefore of limited toxicological relevance. Tests on skin and eye irritation are available for calcium hydroxide. According to the test results, calcium hydroxide fulfils the criteria for classification as “risk of serious damage to eyes” and “irritating to skin”. Calcium hydroxide dissociates into Ca2+ and OH– ions. The irritating/damaging effect is due to a pH shift caused by the released hydroxyl ions. Calcium ions are not associated with skin irritation; therefore the pH-shift is the primary effect of "Reaction mass of limestone and dicalcium silicate" involved in skin irritation. In view of the fact that both calcium hydroxide and "Reaction mass of limestone and dicalcium silicate"result in the same “breakdown products” when administered in the appropriate test system, they can be considered as analogue substances, fulfilling criteria (1) and (2) of Annex XI, point 1.5. In addition, the pH of a saturated solution of "Reaction mass of limestone and dicalcium silicate" has been determined at 12.61, whereas Ca(OH)2 creates a pH value of 12.4 (Fox, 2010b). Therefore, local effects due to "Reaction mass of limestone and dicalcium silicate"will be approximately equivalent to those arising from Ca(OH)2. Based on the above considerations, "Reaction mass of limestone and dicalcium silicate"is voluntarily proposed to be classified as R38 (irritating to skin) and R41 (risk of serious damage to eye) by read-across, which is therefore a conservative approach. In conclusion, since at least one of the criteria for adaptation of testing requirements specified by column 2 of Annexes VII and VIII, point 8.1 is fulfilled (risk of serious damage to eyes, irritating to skin, by read-across), any further testing is considered to be scientifically unjustified.

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)

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

Automatically generated during migration to IUCLID 6, no data available

IUPAC Name:

Automatically generated during migration to IUCLID 6, no data available

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:

Immediatly 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:

other: 24, 48 and 72 hours

Score:

2

Max. score:

2

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:

other: 24, 48, and 72 hours

Score:

0

Max. score:

0

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:

other: 24, 48 and 72 hours

Score:

0

Max. score:

0

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:

other: 24, 48 and 72 hours

Score:

0

Max. score:

0

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:

other: 24, 48 and 72 hours

Score:

2

Max. score:

2

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:

other: 24, 48 and 72 hours

Score:

1

Max. score:

1

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:

irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

Based on the results of the study described in this report and accroding to the Directive 67/548/EEC and subsequent regulations, calcium hydroxide (hydrated lime) in putty form (60 % H2O, 40 % Ca(OH)2),
shall be classified as skin irritating but shall not be classified as corrosive.
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 non-irritating.
CaH2MgO3 is voluntarily proposed to be classified as R38 (irritating to skin) and R41 (risk of serious damage to eye) by read-across, which is a conservative approach (pH effect).