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Toxicological information

Acute Toxicity: dermal

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Administrative data

Endpoint:
acute toxicity: dermal
Type of information:
experimental study
Adequacy of study:
key study
Study period:
08-Dec to 31-Dec 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results. The study report was conclusive, done to a valid guideline and the study was conducted under GLP conditions.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010
Report Date:
2010

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 402 (Acute Dermal Toxicity)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method B.3 (Acute Toxicity (Dermal))
Deviations:
no
GLP compliance:
yes
Test type:
other: Standard acute dermal method
Limit test:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent
Details on test material:
Identification: di-tert-butyl-3,3,5-trimethylcyclohexylidene diperoxide (CAS# 6731-36-8)
Trade name: Trigonox 29
Description: Colorless liquid
Batch Number: 0905137109
Purity: 98.16%
Stability of Test Item: Stable under storage conditions.
Expiry Date: Jan 6 2011
Storage Conditions: In a freezer (-20 ± 5°C) away from direct sunlight.
Safety Precautions: Routine hygienic procedures were used to ensure the health and safety of the personnel.

Test animals

Species:
rat
Strain:
Wistar
Sex:
male/female
Details on test animals and environmental conditions:
TEST ANIMALS
Animals: Rat, RccHanTM: WIST(SPF)
Rationale: Recognized by international guidelines as a recommended test system.
Breeder: Harlan Laboratories B.V. / Kreuzelweg 53 / 5961 NM Horst / The Netherlands
Number of Animals per Group: 5 males and 5 females
Age at Treatment: Males: 8 weeks / Females: 12 weeks
Body Weight Range at Treatment: 227.2 g – 249.8 g (males) / 208.1 g – 211.2 g (females)
Identification: Unique cage number and corresponding color-coded spots on the tail. The animals were marked at acclimatization start.
Randomization: Selected by hand at time of delivery. No computer generated randomization program.
Acclimatization: Under laboratory conditions, after health examination. Only animals without any visible signs of illness were used for the study.

ENVIRONMENTAL CONDITIONS
Standard Laboratory Conditions. Air-conditioned with 10-15 air changes per hour, and continuously monitored environment with ranges for room temperature 22 ± 3 °C and for relative humidity between 30-70% (values above 70% during cleaning process possible), automatically controlled light cycle of 12 hours light and 12 hours dark, music during the daytime light period.

Administration / exposure

Type of coverage:
semiocclusive
Vehicle:
unchanged (no vehicle)
Details on dermal exposure:
The test item was applied undiluted as delivered from the Sponsor. The doses were calculated based upon the rats’ body weight.

One day before treatment, the backs of the animals were clipped with an electric clipper, exposing an area of approximately 10% of the total body surface. Only those animals without injury or irritation on the skin were used in the test.

On test day 1, the test item was applied at a dose of 2000 mg/kg body weight evenly on the intact skin with a syringe and covered with a semi-occlusive dressing. The dressing was wrapped around the abdomen and fixed with an elastic adhesive bandage.

Application volume/kg body weight: 2 mL

Twenty-four hours after the application the dressing was removed and the skin was flushed with lukewarm tap water and drapped off with disposable paper towels. Thereafter, the reaction sites were assessed.
Duration of exposure:
24 hours
Doses:
2000 mg/kg body weight
No. of animals per sex per dose:
5 males / 5 females
Control animals:
not required
Details on study design:
Five male and five female RccHan:WIST (SPF) rats were treated with di-tert-butyl-3,3,5-trimethylcyclohexylidene diperoxide (CAS# 6731-36-8) at 2000 mg/kg by dermal application. The test item was applied undiluted as delivered from the Sponsor at a volume dosage of 2 mL/kg. The application period was 24 hours. The animals were examined daily during the acclimatization period and mortality, viability and clinical signs were recorded. All animals were examined for clinical signs within the first 30 minutes and at approximately 1, 2, 3 and 5 hours after treatment on day 1 and once daily during test days 2 - 15. Local signs were noted once daily from test day 2 to 15. Mortality/viability was recorded within the first 30 minutes and at approximately 1, 2, 3 and 5 hours after administration on test day 1 (with the clinical signs) and twice daily during days 2 - 15. Body weights were recorded on day 1 (prior to administration) and on days 8 and 15. All animals were necropsied andexamined macroscopically.
Statistics:
No statistical analysis was used.

Results and discussion

Effect levels
Sex:
male/female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Mortality:
No deaths occurred during the study.
Clinical signs:
No clinical signs were evident during the course of the study.
Body weight:
The body weight of the animals was within the range commonly recorded for this strain and age.
Gross pathology:
Dermal sores were noted on the skin of two males and one female.
Other findings:
Generalized erythema, slight in degree, was noted in four males and one female after removal of the semi-occlusive bandage 24 hours afteradministration. This finding was reversible by the following observation. In two additional females, slight erythema was noted from day 4 - 7 of observation and on days 2 - 8 of observation, respectively.

Dermal sores, slight to moderate in degree, were noted in three males (days 10 - 13, days 6 - 15 and days 9 - 15) and in one female (days 9 - 15). Desquamation (slight to moderate) was noted in four males, beginning on day 5 of observation and persisting until the end of the observation period. Desquamation was also seen in three females. In two females, this was already evident on days 3 or 5 of observation and persisted until the end of the observation period, whereas one female showed slight desquamation on day 7 of observation only.

Any other information on results incl. tables

Please see attachment "Local Dermal Signs"

Applicant's summary and conclusion

Interpretation of results:
not classified
Remarks:
Migrated information Criteria used for interpretation of results: EU
Conclusions:
The median lethal dose of di-tert-butyl-3,3,5-trimethylcyclohexylidene diperoxide (CAS# 6731-36-8) after single dermal administration to rats of both sexes (LD 50), observed over a period of 14 days, is greater than 2000 mg/kg body weight.
Executive summary:

Five male and five female RccHan:WIST (SPF) rats were treated withdi-tert-butyl-3,3,5-trimethylcyclo hexylidene diperoxide (CAS# 6731-36-8)at 2000 mg/kg by dermal application. The test item was applied undiluted as delivered from the Sponsor at a volume dosage of 2 mL/kg. The application period was 24 hours. The animals were examined daily during the acclimatization period and mortality, viability and clinical signs were recorded. All animals were examined for clinical signs withinthe first 30 minutesand at approximately 1, 2, 3 and 5 hours after treatment on day 1 and once daily during test days 2 - 15. Local signs were noted once daily from test day 2 to 15. Mortality/viability was recorded withinthe first 30 minutesand at approximately 1, 2, 3 and 5 hours after administration on test day 1 (with the clinical signs) and twice daily during days 2 - 15. Body weights were recorded on day 1 (prior to administration) and on days 8 and 15. All animals were necropsied and examined macroscopically.

 

No deaths occurred during the study. No clinical signs were evident during the course of the study. The body weight of the animals was within the range commonly recorded for this strain and age.

 

Local effects included slight generalized erythema in four males and one female after removal of the semi-occlusive bandage 24 hours after administration. This finding was reversible by the following observation. In two additional females, slight erythema was noted from day 4 - 7 of observation and on days 2-8 of observation, respectively.

Dermal sores were noted in three males (days 10 - 13, days 5 - 15 and days 9 - 15) and in one female (days 9 - 15). Desquamation was noted in four males from day 4 of observation and persisting until the end of the observation period. Desquamation was also seen in three females. In two females, this was already evident on days 3 or 5 of observation and persisted until the end of the observation period, whereas one female showed slight desquamation on day 7 of observation only.

 

At necropsy, dermal sores were noted on the skin of two males and one female.

The median lethal dose of di-tert-butyl-3,3,5-trimethylcyclohexylidene diperoxide (CAS# 6731-36-8) after single dermal administration to rats of both sexes (LD 50), observed over a period of 14 days, is greater than 2000 mg/kg body weight.