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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 247-094-1 | CAS number: 25550-51-0
Endpoint summary
Administrative data
Description of key information
Additional information
No data was available for MHHPA. Instead a read across approach was used, assessing data of 4 MHHPA, as these substance was considered to show similar environmental fate properties.
Stability
Phototransformation in air: Half-life for reaction with photochemically-produced hydroxyl radicals estimated to be 45.268 hours
Hydrolysis: Half life - at ph 4: 1.43 minutes at 20 deg C; 2.04 minutes at 30 deg C and 0.692 minutes at 50 deg C. at ph 7: 1.90 minutes at 20 deg C; 1.26 minutes at 30 deg C and 0.327 minutes at 50 deg C. at ph 9: 1.27 minutes at 20 deg C; 1.18 minutes at 30 deg C and 0.233 minutes at 50 deg C.
Biodegradation
Ready biodegradability in water: 2% in 28 days
Bioaccumulation
The potential for bioaccumulation of the substance is low - estimated BCF 11.12 L/kg ww.
Transport and distribution
Koc has been calculated using the computer program KOCWIN (v.2.00). It is predicted that the substance has a Koc of 41.94 L/kg, supporting the premise that the substance is likely to be highly mobile in soil and sediment.
The Henry's Law constant of 2.90 Pa-m3/mole indicates that the substance is not significantly volatile from surface water.
Distribution in environmental compartments has been calculated using a Fugacity model according to Mackay, Level III. Distribution in various environmental compartments is estimated as: Air - 4.79%; Water - 39.1%; Soil - 56% and Sediment - 0.088%. However, the substance is known to be unstable, rapidly hydrolysing to the corresponding di-carboxylic acid in aqueous media and this process is expected to occur in the environment should release occur. As a result the calculated distribution may not be a reasonable estimate. Similar modelling of the degradation product of the substance, 4 -methyl-1,2 -cyclohexanedicarboxylic acid, estimated distribution in the various environmental compartments as: Air - 0.0000228%; Water - 19.9%; Soil - 80% and Sediment - 0.117%. Refinement of the modelling, undertaken as part of the CSA, and taking account of the uses of the substance, does not support these estimates.
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.
