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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 293-659-0 | CAS number: 91081-53-7
Boiling point
Administrative data
Link to relevant study record(s)
Description of key information
No boiling point was observed for substances in the category Rosin, hydrogenated rosin and their salt up to the temperature tested (up to 275°C) in the test procedures.
Resins may discolour to dark brown when heated above 150°C. This phenomenon is not the consequence of mass decomposition of the substance. Rather, hydroperoxydes (oxidized resin acids) develop during ambient storage upon exposure to air and the heating of those hydroperoxides causes their decomposition: this forms high extinction coefficient chromophores (hydroperoxyde cleavage) in small concentrations.
Any heating to elevated temperatures should occur under inert gas conditions to prevent darkening of the product.
Test was terminated at 275°C and no boiling point was observed. No decomposition was observed.
Sample discoloured to dark brown at 275°C. This phenomenon is not the consequence of a decomposition reaction of the substance. Hydroperoxydes (oxydized resin acids) develop during ambient storage and the heating of those hydroperoxydes cause their decomposition: this forms powerfull chromophores (hydroperoxyde cleavage) that even in very small amount color the resin and bring the darkening.
Key value for chemical safety assessment
Additional information
A GLP-compliant study, conducted according to EU Method A.2 (Siwoloboff), was provided for Rosin, reaction products with formaldehyde (Chilworth Technology, 2010a).
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.
