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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 918-594-3 | CAS number: 7723-14-0
Melting point / freezing point
Administrative data
Link to relevant study record(s)
Description of key information
Melting at approximately 600°C (at 42 bar).
Decomposition starts at about 300°C at atmospheric pressure.
Key value for chemical safety assessment
Additional information
Heating of red phosphorus in an inert atmosphere causes no significant changes up to a temperature of about 300°C. On further heating the vapour pressure slowly increases by the formation of gaseous white phosphorus, consisting of P4-molecules. Between 400 and 420°C the vapour pressure of red phosphorus reaches 1 bar. The melting point of red phosphorus can therefore only be observed under higher pressure. According to several independent measurements the transition into the liquid state occurs between 579° and 625°C, depending on the purity and the degree of crystallinity. The corresponding pressure is approximately 42 bars.
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.
