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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Physical & Chemical properties


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Administrative data

Link to relevant study record(s)

Description of key information

In a weight of evidence approach the density of the compound can be described as follows: 
CRC (2008): 3.0 g/cm3 at room temperature
Merck (2006): relative density = 3.004 at 15 °C

Key value for chemical safety assessment

Additional information

According to handbook data (Merck index and CRC handbook) selenous acid has a density of ca. 3.0 g/cm3 at 15 °C / room temperature. Handbook data considered to be from a trusted source acc. to "ECHA, Guidance on information requirements and chemical safety assessment – Chapter R.7a: Endpoint specific guidance", and therefore, the value could be regarded as valid.