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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 231-974-7 | CAS number: 7783-00-8
Endpoint summary
Administrative data
Description of key information
Additional information
For five endpoints (appearance, melting point, density, vapour pressure and water solubility) data on the physical and chemical properties of selenous acid was taken from the handbooks (e.g. CRC, 2008; Merck, 2006). Waivers are proposed for boiling point, partition coefficient, surface tension, flash point, explosiveness, stability in organic solvents, dissociation constant and viscosity, as well as for pyrophoric properties and flammability in contact with water.
No reliable data is available for particle size distribution, auto flammability, flammability (in air) and oxidising properties.
Summary of results:
Property |
Value |
Substance type |
inorganic compound |
Appearance/physical state/colour |
white, odourless, hygroscopic crystals, prisms or powder (under atmospheric pressure and room temperature) |
Melting/freezing point |
Substance decomposes at 70 °C |
Boiling point (at 1013 hPa) |
No boiling point, since substance decomposes before boiling |
Density at 20⁰C |
Relative density is 3.0 at room temperature / 15 °C |
Particle size distribution |
No data |
Vapour pressure |
2 mm Hg at 15 °C |
Partition Coefficient |
Not required for inorganic substances |
Water solubility at 20⁰C |
Very soluble |
Surface tension at 25⁰C |
Not expected to be surface active |
Flash point |
Not required for inorganic solid substances |
Self ignition temperature |
Non-combustible (No reliable source) |
Flammability |
Non-flammable (No reliable source); pyrophoric properties and flammability in contact with water not expected |
Explosiveness |
Not expected to possess explosive properties |
Oxidising properties |
No testing data available |
Stability in organic solvents and identity of relevant degradation products |
Not considered critical for an inorganic substance |
Dissociation constant |
No relevant functional groups, thus considered not required |
Viscosity |
Not required for solids |
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.
