Alkanes, C8-9-iso-

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Study period:

July - September 1961

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Comparable to guideline study with acceptable restrictions.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1961

Report date:

1961

Materials and methods

Principles of method if other than guideline:

Standard acute method, applying 4 different doses to the clipped, intact abdominal skin

GLP compliance:

no

Test type:

standard acute method

Limit test:

no

Test material

Test material information

Constituent 1

Reference substance name:

Hydrocarbons, C7-C9, isoalkanes

EC Number:

921-728-3

IUPAC Name:

Hydrocarbons, C7-C9, isoalkanes

Details on test material:

- Name of test material (as cited in study report): MRD-61-33 (ISOPAR C)
- Physical state: colorless liquid
- Substance type: colorless liquid
- Analytical purity: 100% pure commercial product
- Impurities (identity and concentrations): free of impurities
- Other: aromatic odor

Test animals

Species:

rabbit

Strain:

other: albino

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Weight at study initiation: 1.4 - 2.3 kg
- Housing: Throughout the observation period, the rabbits were housed individually in metal cages elevated above the droppings. Purina Rabbit Pellets and water were freely available at all times.

Administration / exposure

Type of coverage:

occlusive

Vehicle:

unchanged (no vehicle)

Details on dermal exposure:

TEST SITE
- Area of exposure: abdominal skin
- Type of wrap if used: dental daming binder; wrapped with gauze and adhesive tape


REMOVAL OF TEST SUBSTANCE
- Washing (if done): with sponge and warm water
- Time after start of exposure: 24 hours

Duration of exposure:

24 hours

Doses:

100, 316, 1000, 3160 µL/kg bw

No. of animals per sex per dose:

4

Control animals:

yes

Details on study design:

- Duration of observation period following administration: 14 days (daily)
- Frequency of observations and weighing: 0, 1, 4, 24 hours
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight,organ weights, histopathology

Results and discussion

Effect levels

Effect levels 1

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 3.16 mL/kg bw

Effect levels 2

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 200 - 2 500 mg/kg bw

Remarks on result:

other: Recalculated values based on the LD50 of 3.16 mL/kg bw; the range of LD50 is due to the range of density 0.71 -0.78 g/cm3.

Mortality:

There were three deaths, one at each at the 100, 1000, and 3160 µL/kg bw levels. These deaths were apparently the result of a severe intestinal infection. Blood samples were collected by cardiac puncture. All samples were frozen

Clinical signs:

other: 100 µL/kg dose: 2 animals normal in appearance and behaviour; One animal normal until 11th day, at which time this animal showed diarrhea and on day 14 depression, labored respiration, diarrhea 316 µL/kg dose: all animals showed normal behaviour 1000 µL/k

Gross pathology:

100 µL/kg dose: congestion of the kidneys, inflammation of the samll intestine, and a large amount of fluid in the gastrointestinal tract was found in one animal sacrificed
316 µL/kg dose: no pathology observed
1000 µL/kg dose: no pathology observed
3160 µL/kg dose: firm, elevated, blanched areas on the gallbladder, and extensive amount of fluid in the peritoneal cavity, and inflammation of the intestines

Other findings:

Dermal effects: Following removal of the binders at the end of the exposure period, the abdomens and binders were dry. At this time, the exposed skin areas of the animals showed a slight degree of erythema. Within an additional one to three days, the erythema had completely subsided in all animals. The low level animals showed no other signs of irritation during the reminder of the observation period. The high level animals showed slight or moderate desquamation during the final few days of the first week and during the second week. At termination, however, the exposed skin of the surviving animals was completely free of signs of irritation.

Applicant's summary and conclusion

Interpretation of results:

not classified

Remarks:

Migrated information Criteria used for interpretation of results: other: CLP

Conclusions:

There is no need for classification.

Executive summary:

There is no need for classification.