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Diss Factsheets

Administrative data

acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
7.6.2010 - 25.6.2010
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: This study was carried out in accordance with internationally valid GLP principles.

Data source

Reference Type:
study report
Report date:

Materials and methods

Test guideline
according to guideline
EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)
GLP compliance:
yes (incl. QA statement)
Test type:
acute toxic class method
Limit test:

Test material

Constituent 1
Reference substance name:
Tar, brown-coal, low-temp.
EC Number:
EC Name:
Tar, brown-coal, low-temp.
Cas Number:
Molecular formula:
Not known - the substance is complex of hundreds organic compounds.
Tar, brown-coal, low-temp.
Details on test material:
- Name of test material (as cited in study report): Tar, brown-coal, low-temp.
- Molecular formula: not known - UVCB substance
- Molecular weight: not known - UVCB substance
- Smiles notation: not known - UVCB substance
- InChl: not known - UVCB substance
- Substance type: technical product
- Physical state: viscous liquid
- Lot/batch No.: T201E
- Expiration date of the lot/batch: 31.3.2011
- Stability under test conditions: stable
- Storage condition of test material: The substance was stored in closed vessel in dry room at the temperature bellow 25ºC in dark

Test animals

Details on test animals or test system and environmental conditions:
- Source:breeding farm VELAZ s.r.o., Koleč u Kladna, Czech Republic, RČH CZ 21760152
- Age at study initiation: 8 - 10 weeks at the time application
- Weight at study initiation: 134 - 152 g
- Fasting period before study: 12 hours
- Housing: animal room with monitoring conditions – 3 animals of one sex in one plastic breeding cage Velaz T4
- Diet: ST 1 BERGMAN – standard pelleted diet ad libitum
- Water: drinking tap water ad libitum (quality corresponding to Regulation No. 252/2004 Czech Coll. of Law)
- Acclimation period: a least 5 days
- Bedding: sterilized shavings of soft wood
- Randomisation: according to the internal rule, at the start of the study the weight variation of animals was minimal and did not exceed ± 20 % of the mean weight
- Identification of animals: colour marks 1 - 3 on tail of animals, each cage was marked with the number of study and dose of the test substance
- Health condition: certificate of good health condition – from breeding farm; no signs of diseases were observed at clinical check-in, during the acclimatisation period and before the start of study.

- Temperature: room temperature 22 +/- 3°C, permanently monitored
- Humidity: relative humidity 30 – 70 %, permanently monitored
- Photoperiod (12 hours light/12 hours dark)

Time schedule of observations:
Body weight: before application, the 8th day and before euthanasia of animals
Mortality: daily
Clinical examination: daily
Pathological examination: 15th day

Administration / exposure

Route of administration:
oral: gavage
olive oil
The dose volume was the same in all steps (in all doses): 1 mL of olive oil solution / 100 g body weight.
Details on oral exposure:
- Concentration in vehicle:
Preparation and application of the test substance:
Immediately before application the test substance was weighed, mixed in vehicle (olive oil) and resulting suspension was administered to the stomach by tube. The single volume of administered suspension was 1mL/100 g of animal body weight.

- Justification for choice of vehicle: applicable suspension
Olive oil – Oleum olivae
Batch No.: 4726901
Expiration: 08/2011
Producer: Dr. Kulich, Pharma Hradec Králové, Czech Republic

MAXIMUM DOSE VOLUME APPLIED: 1mL/100 g of animal body weight

- Rationale for the selection of the starting dose: Test procedure with a starting dose of 300 mg/kg was selected. This low staring dose was selected by reason of the substance is known to be toxic, corrosive for eyes and skin, sensitizing to skin and it is dangerous for environment. Further it is carcinogen of category 1. The test substance in this dose level was administered to group of 3 females. Because this dose not caused a death of females, the dose level was increased to 2000 mg/kg of body weight and applied sequentially to two groups of 3 females. No death of animals was observed, therefore the testing was finished.

Testing schedule (according to EU Method B.1 tris Annex 1D):
START: 300 mg/kg – 3 females (Step No.1): no death ► 2000 mg/kg – 3 females (Step No. 2): no death ► 2000 mg/kg – 3 females (Step No. 3): no death ► END of study

300 mg/kg of animal body weight
2000 mg/kg of animal body weight

No. of animals per sex per dose:
9 animals - females
Step No. 1: 3 females
Step No. 2: 3 females
Step No. 3: 3 females

Control animals:
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of weighing: Animals were weighed before application, on the 8th day of study and at day 15, before euthanasia of animals.
- Frequency of observation: After application the animals were observed individually – the first day: twice (30 minutes and 3 hours after application), the second day: twice (in the morning and in the afternoon) and daily thereafter for 14 days.
Observations included changes in skin and fur, eyes, visible mucous membranes, behaviour of animals, somatomotor activity, reactions to stimuli, presence of lacrimation, salivation and discharge from nostrils, function of respiratory, digestive and urogenital system.
- Necropsy of survivors performed: yes
All test animals survived to the end of study were sacrificed on the 5th day by prolonged ethereal narcosis and gross necropsy was carried out. Nutritious status, body surface, body foramina, thoracic, abdominal and cranial cavity were evaluated.

Results and discussion

Preliminary study:
Effect levels
Dose descriptor:
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
No mortality
Clinical signs:
other: No clinical sings of intoxication were recorded at the dose 300 mg/kg. At the dose 2000 mg/kg clinical signs of intoxication (piloerection; anaemic mucous membranes; gibbous posture; decreased response to stimuli) were observed in all six animals in the
Gross pathology:
No pathologic macroscopic changes in all nine animals were observed.

Applicant's summary and conclusion

Interpretation of results:
not classified
Migrated information Criteria used for interpretation of results: EU
Executive summary:

The aim of the study was to investigate acute toxic effects of the test substance - Tar, brown-coal, low-temp.- after a single oral administration to Wistar rats.

The testing was performed according to the Method B.1 tris: Acute Oral Toxicity - Acute Toxic Class Method, Council Regulation (EC) No.440/2008, published in O.J. L 142, 2008.

Test substance was administered in a single dose as a solution in olive oil (vehicle), given orally via gavage to three groups of three female Wistar rats.

The dosing was performed sequentially in three groups of three females:

group No. 1 - first step using the starting dose of 300 mg/kg of body weight,

group No. 2 - second step using dose of 2000 mg/kg of body weight group and

group No. 3 - third step using dose of 2000 mg/kg of body weight group.

Test procedure with a starting dose of 300 mg/kg was selected by reason of suspect of mutagenic, carcinogenic and toxic properties.


The test substance administered at the dose of 300 mg/kg and 2000 mg/kg caused no death of animals. 

No clinical sings of intoxication were recorded at the dose 300 mg/kg.

At the dose 2000 mg/kg clinical signs of intoxication (piloerection; anaemic mucous membranes; gibbous posture; decreased response to stimuli) were observed in all six animals in the 1st day after application. In the 2nd day after application no clinical signs of intoxication were observed in all surviving animals.

No pathologic macroscopic changes in all nine animals were observed.


According to the study results the value of LD50 of the test substance for female rats is higher than 2000 mg/kg of body weight.