Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Appearance / physical state / colour

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Administrative data

Link to relevant study record(s)

Description of key information

In a weight of evidence approach the appearance of the compound is described as follows: 
CRC (2008): White hygroscopic crystals.
Merck (2006): Deliquescent hexagonal prisms.
Supporting data:
EFSA (2009): white, odourless crystalline powder.

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:

Additional information

According to handbook data (Merck index and CRC handbook) and the supporting information stated in the EFSA report selenous acid appears as white, odourless, hygroscopic crystals, prisms or powder. 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 description could be regarded as valid.