Reaction Mass of 3,3-diphenylhexamethyltrisiloxane and 3,3,5,5-tetraphenylhexamethyltetrasiloxane

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

29 June 2004 to 08 July 2004

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2004

Report date:

2004

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Version / remarks:

2002

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

1992

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

-

EC Number:

451-620-7

EC Name:

-

Cas Number:

352230-22-9

Molecular formula:

Constituent 1: C18H28O2Si3 Constituent 2: C30H38O3Si4

IUPAC Name:

2,2,6,6-tetramethyl-4,4-diphenyl-3,5-dioxa-2,4,6-trisilaheptane; 2,2,8,8-tetramethyl-4,4,6,6-tetraphenyl-3,5,7-trioxa-2,4,6,8-tetrasilanonane

Test material form:

liquid

Specific details on test material used for the study:

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: at room temperature, protected from light
- Stability under test conditions: stable under test conditions
- 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

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: The test material was applied undiluted.
- Preliminary purification step (if any): none
- Final dilution of a dissolved solid, stock liquid or gel: not applicable
- Final preparation of a solid: not applicable

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Elevage Scientifique des Dombes, France
- Age at study initiation: 10 weeks
- Weight at study initiation: not specified
- Housing: individually in stainless steel cages
- Diet: pelleted standard rabbit maintenance diet, ad libitum
- Water: community tap water, ad libitum
- Acclimation period: Under laboratory conditions after health examination. Only animals without any visual signs of illness were used for the study.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 17-23 °C
- Humidity (%): 30-70%
- Air changes (per hour): 10-15
- Photoperiod (hours dark / hours light): 12/12

Test system

Preparation of test site:

clipped

Vehicle:

unchanged (no vehicle)

Controls:

not required

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.5 mL
- Concentration (if solution): not applicable

VEHICLE
The test material was applied undiluted.

NEGATIVE CONTROL
Not used.

POSITIVE CONTROL
Not used.

Duration of treatment / exposure:

4 hours

Observation period:

at 24, 48 and 72 hours

Number of animals:

3

Details on study design:

TEST SITE
- Area of exposure: left flank
- % coverage: 10 % (10cm x 10cm)
- Type of wrap if used: The patch was covered with a semi-occlusive dressing. The dressing was wrapped around the abdomen and anchored with tape.

REMOVAL OF TEST SUBSTANCE
- Washing (if done): yes. The skin was flushed with lukewarm water.
- Time after start of exposure: 4 hours

OBSERVATION TIME POINTS
The animals were observed daily from acclimatisation period till study termination for mortality, viability and clinical signs of toxicity. Body weights were recorded at start of acclimatisation, on the day of application and at termination of observation.

SCORING SYSTEM:
- Method of calculation: Draize

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0.33

Max. score:

4

Reversibility:

fully reversible within: 48 hours

Remarks on result:

no indication of irritation

Results 2

Irritation parameter:

erythema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0.33

Max. score:

4

Reversibility:

fully reversible within: 48 hours

Remarks on result:

no indication of irritation

Results 3

Irritation parameter:

erythema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0.67

Max. score:

4

Reversibility:

fully reversible within: 72 hours

Remarks on result:

no indication of irritation

Results 4

Irritation parameter:

edema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Max. score:

4

Remarks on result:

no indication of irritation

Results 5

Irritation parameter:

edema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Max. score:

4

Remarks on result:

no indication of irritation

Results 6

Irritation parameter:

edema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Max. score:

4

Remarks on result:

no indication of irritation

Irritant / corrosive response data:

No clinical signs of systemic toxicity were observed in any of the test animals during the study and no mortality occurred. Neither alterations of the treated skin were observed nor were corrosive effects evident on the skin. Body weight of all rabbits were considered to be within the normal range of variability.

Other effects:

None

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

In the skin irritation study, conducted according to appropriate OECD test guidelines and in compliance with GLP, the test material was reported to be not irritating to skin.