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EC number: 219-799-4
CAS number: 2536-05-2
The test substance is covered by the category approach of methylenediphenyl diisocyanates (MDI). Hence, data of the category substances can be used to cover this endpoint. The read-across category justification document is attached in IUCLID section 13.
Two acute studies in terrestrial organisms are available. A short-term toxicity study in earthworms and a study in plants (van der Hoeven et al., 1992b; van der Hoeven et al., 1992a) with the source substance pMDI. The results did not show any adverse effects (LC50 > 1000 mg/kg dw). This low toxicity is consistent with the overall hypothesis that MDI substances hydrolyse quickly when in contact with water to form insoluble polyurea and therefore no MDA is available to soil organisms. It is inevitable that all substances of the category will form such insoluble polyurea and show limited availability to the terrestrial compartment.Since all category substances have similar behaviour in the (aquatic) environment (rapid hydrolysis, formation of polyurea), it is concluded that none of the substances of the category will exhibit toxicity towards terrestrial organisms in analogy to pMDI as representative and source substance of the category. The read-across and the assessment is considered appropriate in terms of the level of confidence.
For the safety assessment however, a PNECterrestrial has been derived applying the Equilibrium Partitioning Method. A value for the PNECterrestrial of 2.33 mg/kg soil dw is considered for all the MDI substances of the category. Details can be found in the section 6. Ecotoxicological information.
To make the endpoint more robust, the registrant will perform additional OECD 222 studies. The data will be generated on the three boundary substances of the category 4,4'-MDI/DPG/HMWP, 4,4'-MDI and pMDI.
Testing proposals for the OECD 222 studies with these three substances are added to the respective dossiers. A category approach will be used to fulfill the data requirement for the registered substance.
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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