Registration Dossier

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Category name:

Justifications and discussions

Category definition:
LANXESS Deutschland GmbH has registered three triphenyl phosphates derivates of similar chemical structure: TPP, CDP and TCP. For these three substances a category approach is undertaken.
Category rationale:
The category consists of three methyl phenyl phosphoric acid esters with main components of zero (TPP), one (CDP) and three (TCP) methyl groups. Primarily, the number of methyl groups is the leading property for determining the (eco-)toxicity with TPP showing the lowest and TCP the highest toxicity with CDP in between. This trend is based on the fact that the log Kow as a main driver for toxicity is increasing within the category from TPP over CDP to TCP.