1,3,5-trimethyl-1,1,3,5,5-pentaphenyltrisiloxane

Endpoint summary

Description of key information

In the key acute oral toxicity study, conducted according to OECD TG 423, and in compliance with GLP, an LD₅₀ value of >2000 mg/kg bw was reported (LPT, 2002).

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records

Reference

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2002-05-10 to 2002-08-09

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Deviations:

no

GLP compliance:

yes

Test type:

acute toxic class method

Limit test:

yes

Species:

rat

Strain:

other: Crl: CD

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River, Germany
- Age at study initiation: males - 42 days; females - 50 days
- Weight at study initiation: males - 219 - 244 g; females - 193 - 200 g
- Fasting period before study: none
- Housing: in groups of 2-3 in MAKROLON cages
- Diet: Standard diet for rats and mice ssniff R/M-H V1530, ad libitum
- Water: drinking water, ad libitum
- Acclimation period: 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22°C +/- 3°C
- Humidity (%): 55 % +/- 15 %
- Photoperiod (hrs dark / hrs light): 12/ 12

Route of administration:

oral: gavage

Vehicle:

unchanged (no vehicle)

Details on oral exposure:

MAXIMUM DOSE VOLUME APPLIED: 1.87 mL/ kg bw

CLASS METHOD (if applicable)
- Rationale for the selection of the starting dose: the dose used was selected from a series of defined dose levels

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

3 males and 3 females

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Observations were made before and immediately, at 5, 15, 30 and 60 minutes, as well as at 3, 6, 24 hours after administration. Body weights were recorded before administration and thereafter in weekly intervals up to the end of the study.
- Necropsy of survivors performed: yes. At the end of the study period all the animals were sacrificed, dissected and inspected macroscopically.
- Other examinations performed: changes of skin and fur, eyes and mucous membranes, respiratory and the circulatory, autonomic and central nervous system, somatomotor activity as well as behaviour pattern were observed at least once a day until all the symptoms subsided, thereafter each working day. Attention was also paid to tremor, convulsions, salivation, diarrhoea, lethargy, sleep and coma.

Statistics:

No statistics were used in the study.

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No mortality occurred during the 14-day study period.

Clinical signs:

other: No clinical signs of systemic toxicity were noted during the 14-day study period.

Gross pathology:

No macroscopic abnormalities were observed at post mortem examination.

Other findings:

There were no other findings in the study.

Interpretation of results:

GHS criteria not met

Conclusions:

In the acute oral toxicity study, conducted according to OECD TG 423, and in compliance with GLP, an LD50 value of > 2000 mg/kg bw was reported.

Executive summary:

In the acute oral toxicity study, conducted according to OECD TG 423, and in compliance with GLP, an LD50 value of > 2000 mg/kg bw was reported.

A single dose of 2000 mg/kg bw of undiluted test substance was administered orally to 3 male and 3 female rats. Observations were made before and immediately, at 5, 15, 30 and 60 minutes, as well as at 3, 6, 24 hours after administration. Body weights were recorded before administration and thereafter in weekly intervals up to the end of the 14 -day study. At the end of the study period all the animals were sacrificed, dissected and inspected macroscopically.

No mortality occurred during the 14 -day study period. No signs of systemic toxicity were noted. No macroscopic abnormalities were observed at necropsy.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

LD50

Value:

2 000 mg/kg bw

Acute toxicity: via inhalation route

Endpoint conclusion

Endpoint conclusion:

no study available

Acute toxicity: via dermal route

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

In the acute oral toxicity study, conducted according to OECD TG 423, and in compliance with GLP, an LD50 value of >2000 mg/kg bw was reported (LPT, 2002).

A single dose of 2000 mg/kg bw of undiluted test substance was administered orally to 3 male and 3 female rats. Observations were made before and immediately, at 5, 15, 30 and 60 minutes, as well as at 3, 6, 24 hours after administration. Body weights were recorded before administration and thereafter in weekly intervals up to the end of the 14-day study. At the end of the study period all the animals were sacrificed, dissected and inspected macroscopically.

No mortality occurred during the 14-day study period. No signs of systemic toxicity were noted. No macroscopic abnormalities were observed at necropsy.

Justification for classification or non-classification

Based on the available data for 1,3,5-trimethyl-1,1,3,5,5-pentaphenyltrisiloxane, no classification is required for acute toxicity according to Regulation (EC) No. 1272/2008.