Polysulfides, di-tert-dodecyl

Toxicity to reproduction

Administrative data

Endpoint:

extended one-generation reproductive toxicity - basic test design (Cohorts 1A, and 1B without extension)

Type of information:

experimental study planned

Study period:

awaiting for ECHA feedback

Justification for type of information:

TESTING PROPOSAL ON VERTEBRATE ANIMALS
Hazard endpoint for which vertebrate testing was proposed: extended one-generation reproductive toxicity - basic test design (Cohorts 1A, and 1B without extension) (OECD TG no. 443) with the registered substance;

CONSIDERATIONS THAT THE GENERAL ADAPTATION POSSIBILITIES OF ANNEX XI OF THE REACH REGULATION ARE NOT ADEQUATE TO GENERATE THE NECESSARY INFORMATION
• available GLP studies: none.
• available non-GLP studies: none.
• historical human data: none.
• (Q)SAR: according to ECHA guidance, QSAR approaches are currently not well fitted-for-purpose for reproductive toxicity and not all necessary aspects can be covered by a QSAR prediction. (ECHA guidance R.7a, October 2015, page 382).
• in vitro methods: in vitro studies are not available on the test substance. Some in vitro test methods have been developed, however, according to Chapter R 7a Version 4.1, the regulatory acceptance of these in vitro methods has not been achieved as they do not provide equivalent information (ECHA guidance R.7a, October 2015, page 381).
• weight of evidence: no data is available which allow a weight of evidence approach.
• grouping and read-across: not appropriate.
• substance-tailored exposure driven testing [if applicable]: not applicable
• [approaches in addition to above [if applicable]: not applicable
• other reasons [if applicable]: none
CONSIDERATIONS THAT THE SPECIFIC ADAPTATION POSSIBILITIES OF ANNEXES VI TO X (AND COLUMN 2 THEREOF) OF THE REACH REGULATION ARE NOT ADEQUATE TO GENERATE THE NECESSARY INFORMATION:
- Test proposal is fully compliant with ECHA guidance (R 7.a-Octobre 2015, page 373). No specific adaptation possibilities of Annexes VI to X (and column 2 thereof) are applicable.

Materials and methods

Test guideline

Guideline:

OECD Guideline 443 (Extended One-Generation Reproductive Toxicity Study)

Principles of method if other than guideline:

“Considering the actual workload of the contract research organizations (CRO) due to the next REACH registration deadline in May 2018 and also due to the test plans on the substances registered in 2013, the limited capacity of CROs to perform the OECD 443 studies and which are booked by the testing of the substances registered in 2010 and also to allow a sequential assessment of the repeated dose toxicity (OECD 408) and reproductive (OECD 414 study in rabbits and OECD 443 study in rats including a range-finding study) end-points of the registered substance, the registrant is requesting a delay of 48 months to update its dossier with the proposed studies.”

Justification for study design:

Design of the OECD 413 study will be defined once the OECD 408 study completed.

Test material

Test material information

1

Reference substance name:

Polysulfides, di-tert-dodecyl

EC Number:

270-335-7

EC Name:

Polysulfides, di-tert-dodecyl

Cas Number:

68425-15-0

Molecular formula:

not applicable

IUPAC Name:

di (alkyl C11-C13 Branched, C12 Rich), polysulfure S3-S5 rich

Test animals

Species:

rat

Administration / exposure

Route of administration:

oral: gavage

Results and discussion

Overall reproductive toxicity

Reproductive effects observed:

not specified