Registration Dossier
Registration Dossier
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EC number: 217-691-1 | CAS number: 1931-62-0
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Data waiving:
- study technically not feasible
- Justification for data waiving:
- other:
Reference
Description of key information
OO-tert-butyl monoperoxymaleate in its marketed form is a suspension at 20 °C. OO-tert-butyl monoperoxymaleate is a solid, but due to the substance's thermal instability (SADT +55 °C) it is only available together with a liquid phlegmatizer. According to Guidance on Information Requirements and Chemical Safety Assessment Chapter R.7a: Endpoint specific guidance, Chapter R.7.1.2, the “melting point / freezing point” is defined as "the temperature at which the phase transition from the solid to the liquid state occurs at atmospheric pressure and this temperature ideally corresponds to the freezing temperature”.
This definition is not applicable to the test item, which is a suspension at 20 °C. The study is disregarded because for the determination of the actual melting point of the active ingredient OO-tert-butyl monoperoxymaleate, which is the solid component of the suspension, the test item needs to be heated. During heating, solving effects of the liquid phlegmatizer may occur and the differentiation between a real phase transition (melting) and solving is not possible. Additionally, the test item is only stable up to a temperature of +55 °C and afterwards decomposes thermally.
Key value for chemical safety assessment
Additional information
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.
