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EC number: 500-287-7 | CAS number: 103170-26-9
Data regarding effects on fertility are not available. A data waiver is claimed.
A grouping of substances and read-across approach according to Regulation (EC) No 1907/2006 (REACH), Annex XI 1.5 and following ECHA Read-Across Assessment Framework, RAAF (2015) is accomplished for five blocked diisocyanate oligomers (also for the test substance isophorone diisocyanate, oligomeristion product, blocked with 2-butanone oxime).
An updated outline of a grouping-strategy based on read-across of the available toxicological data for these five blocked diisocyanate oligomers is attached to the endpoint summaries for ‘Repeated dose toxicity’ and ‘Toxicity to reproduction’ in IUCLID as a separate document.
Based on a grouping and read-across strategy a category was established with the registered substance and 4 other structually similar chemicals. Pilot inhalation toxicity studies with 2 week exposure were conducted in rats with all 5 category members. Thereafter, GLP-conform and Guideline-compliant 90-day subchronic inhalation toxicity studies in rats were performed with two of the category members on request of ECHA. In all of these studies portal-of-entry toxicity (local effects in the respiratory tract) was observed at doses below the Guidance value of 20 mg/m³. Thus, classification with STOT RE 1 (H372) is applicable for all members of the category with regard to local effects in the respiratory tract after inhalative exposure.
As no test substance related adverse systemic toxicity could be seen in the pilot and subchronic (90-day) inhalation toxicity studies or in any of the other available toxicological studies with the category members, no hazard is anticipated with regard to systemic effects. There is no indication for systemic availability and a mode of action related to portal of entry particle toxicity is confirmed, thus, there is sufficient weight of evidence that these substances have not a reproductive or developmental toxicity potential and further testing on vertebrate animals for that property shall be omitted. Considering this, waiving of an extended-one-generation reproductive toxicity study (OECD 443), waiving of a screening test according to OECD 421/422, as well as waiving of developmental toxicity studies (OECD 414) in rats and/or in a second species is considered appropriate.
Update of grouping and read-across strategy of December 2018:
For a detailed discussion of the outcome of the testing strategy and for justification of the grouping and read across of 5 blocked diisocyanate oligomers according to regulation No. 1907/2006 (REACH), Annex XI, 1.5 and following ECHA RAAF (2015) see the document attached to the endpoint summaries for ‘Repeated Dose Toxicity’ and ‘Toxicity to reproduction’ in IUCLID. This document also adresses waiving of reproduction toxicity studies. Overall, based on this justification REACH requirements for repeated dose toxicity as well as for reproductive toxicity can be fulfilled by grouping of substances and read across approach.
Note: The first outline of a grouping-strategy was prepared in May 2013 based on read-across of the available toxicological data for 4 blocked diisocyanate oligomers at that time. In the meantime, the group was enlarged to 5 blocked diisocyanate oligomers and 90-day inhalation toxicity studies have been performed for two of the category members on request of ECHA. The updated document refers to the REACH requirements according to Annex VIII - X (10 - > 1000 tonnes/a).
No developmental toxicity studies are available for the test substance. A data waiver is claimed.
No indication of test substance related adverse systemic toxicity and thus of bioavailability became obvious in the subchronic inhalation study. This result is in line with observations obtained in subacute and acute inhalation toxicity studies with the substance that also revealed no test substance related adverse systemic toxicity. Therefore, no hazard is anticipated with regard to systemic effects after long-term inhalation exposure and a data waiver is claimed for reproductive toxicity studies.
Consequently, classification for toxicity to reproduction and for developmental toxicity according to the criteria of EU Regulation 1272/2008 is not warranted.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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