Reaction mass of Methacryloxypropyl (tris(trialkylsiloxy)silylethyl dimethylsiloxy) silane and oligomers

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

There were no deviations from the study plan

Justification for type of information:

not applicable

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Report date:

2016

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion)

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.2500 (Acute Dermal Irritation)

Deviations:

no

Principles of method if other than guideline:

not applicable

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Reaction mass of Methacryloxypropyl (tris(trialkylsiloxy)silylethyl dimethylsiloxy) silane and oligomers

EC Number:

950-463-6

Molecular formula:

C(33-81)H(86-214)O(11-25)Si(11-28)

IUPAC Name:

Reaction mass of Methacryloxypropyl (tris(trialkylsiloxy)silylethyl dimethylsiloxy) silane and oligomers

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material:
HES10108 (supplied as Dow Corning BY 16-122B
- Expiration date of the lot/batch:
25-August-2017 / Lot number 0008624816
- Purity test date:
-14-April-2016

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material:
0°C -32 °C, protected from light. Do not store with strong
oxidising agents
- Stability under test conditions:
the liquid test item was tested undiluted
- Solubility and stability of the test substance in the solvent/vehicle:
not applicable
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium:
not applicable

Other
- Physical state - liquid
- Color - colorless
- Active components - 95%: 3-Methacryloxypropyltris {[tris(trimethylsiloxy) silyl]
ethyldimethylsiloxy} silane
- Purity - 99.3% (non-volatile content)

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Deutschland, 97633 Sulzfeld, Germany
- Age at study initiation: approximately 20-22 weeks old
- Weight at study initiation: > 2.0 kg
- Housing: Housed in ABS-plastic or Noryl rabbit cages, floor 4200 cm 2
- Diet (e.g. ad libitum): Free access to autoclaved hay and to Altromin 2123 maintenance diet for rabbits, rich in crude fibre
- Water (e.g. ad libitum): Free access to tap water (drinking water, municipal residue control, microbiological controls at regular intervals)
- Acclimation period: Adequate acclimatisation period (at least 5 days) under laboratory conditions

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 18 ± 3 °C
- Humidity (%): 55 ± 10%
- Air changes (per hr): at least 10 x / hour
- Photoperiod (hrs dark / hrs light): Artificial light, sequence being 12 hours light, 12 hours dark

IN-LIFE DATES: From: 18-July-2016 To: 4-August-2016

Test system

Type of coverage:

semiocclusive

Preparation of test site:

clipped

Remarks:

Approximately 24 hours (animals no. 1 and no. 2) and 23 hours (animal no. 3) before the test, the fur was removed from the dorsal area of the trunk by using an electric clipper. Care was taken to avoid abrading the skin.

Vehicle:

unchanged (no vehicle)

Controls:

other: The untreated other side served as control

Amount / concentration applied:

A dose of 0.5 mL of the test item was applied to each test site

Duration of treatment / exposure:

The test item was held in contact with the skin throughout a 4-hour period. At the end of the exposure period, the residual test item was removed with physiological saline 0.9% NaCI.

Observation period:

The animals were observed for 72 hours after the patch removal

Number of animals:

The test item was not expected to produce corrosion, but might be irritating. Therefore, a single patch was applied to one animal for 4 hours. Subsequently, the reminder 2 rabbits were exposed derammly.

Details on study design:

TEST SITE
The test item was applied at a single dose to a small area (approximately 6 cm2) of skin on one side of the dorsal area and covered with a gauze patch, which was held in place with a non-irritating tape. The untreated other side served as control. The test item was applied to the patch first and then applied to the skin. The patch was fixed with a semi-occlusive dressing. The limits of the application site were marked with an ink marker

REMOVAL OF TEST SUBSTANCE
At the end of the exposure period, the residual test item was removed with physiological saline 0.9% NaCI.

OBSERVATION TIME POINTS
The animals were examined for signs of erythema and oedema 1 hour after the patch removal. For the determination of classification-relevant values, the animals were examined for signs of erythema and oedema 24, 48 and 72 hours after the patch removal.

SCORING SYSTEM:
- Method of calculation: Dermal irritation was scored and recorded according to the grades as per Draize score

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

mean

Remarks:

of 3 rabbits

Time point:

24/48/72 h

Score:

0

Max. score:

0

Reversibility:

other:

Remarks:

not applicable

Remarks on result:

no indication of irritation

Remarks:

Neither irritant nor corrosive effects were observed on the intact skin of three female rabbits (strain NZW) after a contact time of 4 hours

Results 2

Irritation parameter:

edema score

Basis:

mean

Remarks:

of 3 rabbits

Time point:

24/48/72 h

Score:

0

Max. score:

0

Reversibility:

other:

Remarks:

not applicable

Remarks on result:

no indication of irritation

Irritant / corrosive response data:

Neither irritant nor corrosive effects were observed on the intact skin of three female rabbits (strain NZW) after a contact time of 4 hours

Other effects:

No adverse changes were observed at the skin sites.There were no significant body weight changes during the observation period.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

Under the conditions of the present study, the single dennal application of the test item HES1 01 08 (Supplied as DOW CORNING® BY 16-122 B)to three rabbits at a dose of 0.5 mL showed neither irritant nor corrosive effects.
Neither mortalities nor significant clinical signs of toxicity were observed.
According to Annex I of Regulation (EC) 1272/2008, the test item HES10108 (Supplied as DOW CORNING® BY 16-122 B) does not have to be classified and has no obligatory labelling requirement for skin irritation.
According to GHS (Globally Harmonized Classification System), the test item HES10108 (Supplied as DOW CORNING® BY 16-122 B) has no obligatory labelling requirement for skin irritation.

Executive summary:

In this skin irritation/corrosion study (conducted according to OECD Guideline 404, EU Method B.4 and EPA OPPTS 870.2500 and in accordance with GLP), three rabbits were dermally exposed, under semi-occlusive conditions to HES10108 (Supplied as DOW CORNING® BY 16 -122 B) at a dose of 0.5 ml for 4 hours and evalauted for skin irritation/corrosion effects.

Under the conditions of the present study, the single dennal application of the test item HES10108 (Supplied as DOW CORNING® BY 16-122 B) to three rabbits at a dose of 0.5 mL showed neither irritant nor corrosive effects.

Neither mortalities nor significant clinical signs of toxicity were observed.

According to Annex I of Regulation (EC) 1272/2008, the test item HES10108 (Supplied as DOW CORNING® BY 16-122 B) does not have to be classified and has no obligatory labelling requirement for skin irritation and according to GHS (Globally Harmonized Classification System), the test item HES10108 (Supplied as DOW CORNING® BY 16-122 B) has no obligatory labelling requirement for skin irritation.