Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 201-607-5 | CAS number: 85-44-9
Endpoint summary
Administrative data
Description of key information
Additional information
Hydrolysis
Phthalic anhydride hydrolysed by 50 % within 30.5 seconds in the presence of water at pH 7 and 25 C, forming phthalic acid.
Photodegradation in air
In the atmosphere a half-life of 21.4 days for phthalic anhydride and 13 days for the hydrolysis product phthalic acid is estimated due to indirect photolysis with hydroxyl radicals, considering an OH-concntration of 500,000 radicals/cm³ as a 24-h average.
Photodegradation in water
In the hydrosphere, phthalic anhydrid is transformed photochemically under anaerobic conditions showing polymerisation to polyphenyl. The half-lifes are in the range from 3.9 h to 9.6 h following first order reactions. For photooxidation in sea water a half-life of 0.93 hours is obtained.
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.
