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Diss Factsheets

Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
07 July 2015 to 04 August 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2015
Report date:
2015

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 420 (Acute Oral Toxicity - Fixed Dose Method)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Test type:
fixed dose procedure
Limit test:
yes

Test material

Constituent 1
Reference substance name:
dicalcium bis(oxosilanebis(olate)) silanedione
EC Number:
940-884-3
Molecular formula:
Not applicable for inorganic UVCB
IUPAC Name:
dicalcium bis(oxosilanebis(olate)) silanedione
Test material form:
solid

Test animals

Species:
rat
Strain:
Wistar
Sex:
female
Details on test animals or test system and environmental conditions:
ANIMALS and ANIMAL HUSBANDRY
- Female Wistar rats were supplied by Envigo RMS (UK) Ltd, Oxon, UK.
- The animals were randomly allocated to cages on receipt.
- Females were nulliparous and non-pregnant.
- After an acclimatisation period of at least 5 days the animals were selected at random and given a unique number within the study by indelible ink-marking on the tail and the number was written on a cage card.
- At the start of the study the animals were 8 to 12 weeks of age.
- Body weight did not exceed ± 20 % of the mean body weight at the start of treatment.
- Animals were housed in groups of up to four in suspended solid-floor polypropylene cages furnished with woodflakes.
- With the exception of an overnight fast immediately before dosing, and for approximately 3 to 4 hours after dosing, free access to mains drinking water and food (2014C Teklad Global Rodent diet supplied by Envigo Research (UK) Ltd, Oxon, UK was allowed throughout the study.
- Diet, drinking water and bedding were routinely analysed and were considered not to contain any contaminants that would reasonably be expected to affect purpose or integrity of the study.
- Temperature and relative humidity were set to achieve limits of 19 to 25 °C and 30 to 70 % respectively.
- Rate of air exchange was at least 15 changes per hour.
- Lighting was controlled by a time switch to give 12 hours continuous light (06:00 to 18:00) and 12 hours darkness.
- Animals were provided with environmental enrichment items considered not to contain any contaminant at a level that might affect the purpose or integrity of the study.

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
arachis oil
Details on oral exposure:
TEST ITEM FORMULATION and EXPERIMENTAL PREPARATION
- For the purpose of the study, the test item was freshly prepared, as required, as a suspension in arachis oil BP. Arachis oil was chosen because the test material did not dissolve or suspend in distilled water.
- The test item was formulated within 2 hours of being applied to the test system and it was assumed that the formulation was stable for that duration.
- No analysis was conducted to determine the homogeneity, concentration or stability of the test item formulation. This is an exception with regard to GLP and was reflected in the GLP compliance statement.
Doses:
- 300mg/kg (concentration 30mg/mL; dose volume 10mL/kg) - 1 animal
- 2000 mg/kg (concentration 20mg/mL; dose volume 10 mL/kg) - 5 amimals
No. of animals per sex per dose:
- In the absence of available data a single female animal dosed at 300 mg/kg
- In the absence of toxicity, a single female animal dosed at 2000 mg/kg
- In the absence of toxicity at the dose level of 300mg/kg, an additional group of four female animals dosed at 2000 mg/kg
Control animals:
no
Details on study design:
- All animals were dosed once by gavage using a metal cannula attached to a graduated syringe.
- The volume administered to each animal was calculated according to the fasted body weight at the time of dosing.
- Treatment of animals was sequential.
- Sufficient time was allowed between each dose level to confirm the survival of the previously dosed animals.
- Clinical observations were made 0.5, 1, 2 and 4 hours after dosing and then daily for 14 days.
- Morbidity and motality checks were made twice daily.
- Individual body weights were recorded on Day 0 (the day of dosing) and on Days 7 and 14.
- Animals were killed by cervical dislocation at the end of the observation period.
- All animals were subjected to gross necropsy consisting of external examination and opening of the abdominal and thoracic cavities. The appearance of any macroscopic abnormalities was recorded but no tissues were retained.

Results and discussion

Preliminary study:
DOSE LEVEL 300 mg/kg
- There was no mortality.
- No signs of systemic toxicity were noted during the observation period.
- The animal showed expected gains in body weight over the observation period.
- No abnormalities were noted at necropsy.

DOSE LEVEL 2000 mg/kg
- There was no mortality.
- No signs of systemic toxicity were noted during the observation period.
- The animal showed expected gains in body weight over the observation period.
- No abnormalities were noted at necropsy.
Effect levels
Key result
Sex:
female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Mortality:
- There were no deaths
Clinical signs:
other: No signs of systemic toxicity were noted during the observation period
Gross pathology:
- No abnormalities were noted at necropsy.

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
The acute oral toxicity of the test material was assessed in accordance with OECD Guideline 420. The acute oral median lethal dose (LD50) of the test item in the female Wistar strain rat was considered to be greater than 2000 mg/kg body weight. Therefore, the test material does not meet the GHS criteria for classification.
Executive summary:

GUIDELINE

The study was designed to be compatible with OECD Guideline for Testing of Chemicals No 420 "Acute Oral Toxicity - Fixed Dose Method" (2001) and Method B1 bis Acute Toxicity (Oral) of Commission Regulation (EC) No 440/2008.

METHOD

Following a sighting test at a dose level of 300 mg/kg & 2000mg/kg , a further group of four fasted female animals were given a single oral dose of the test item as a suspension in arachis oil BP at a dose level of 2000 mg/kg body weight. Clinical signs and body weight development were monitored during the study. All animals were subjected to gross necropsy.

RESULTS

- Mortality: There were no deaths.

- Clinical observations:There were no signs of systemic toxicity.

- Body weight: All animals showed expected gains in body weight.

- Necropsy: No abnormalities were noted at necropsy.

CONCLUSION

The acute oral median lethal dose (LD50) of the test item in the female Wistar strain rat was considered to be greater than 2000 mg/kg body weight.