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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Endpoint summary

Administrative data

Description of key information

Additional information

The majority of data on the physical and chemical properties of zinc selenite was provided by new testing in accordance with GLP: density, particle size (and dustiness testing), water solubility, auto flammability, flammability, pyrophoric properties, and oxidising properties.

Additional available data on the physical and chemical properties of zinc selenite was taken from public domain reviews and handbooks including the CRC (2008), GESTIS database (2009) or MSDS.

Waivers are proposed for boiling point, vapour pressure, partition coefficient, surface tension, flash point, explosiveness, stability in organic solvents, dissociation constant and viscosity, as well as flammability in contact with water.


Summary of results:



Substance type

inorganic compound

Appearance/physical state/colour

white odourless inorganic powder under atmospheric pressure and room temperature

Melting/freezing point

621 °C

Boiling point (at 1013 hPa)

Not required if melting point is above 300 °C

Density at 20C

Relative density is 4.69 at room temperature

Particle size distribution

L50: 17.4 µm  (laser diffraction, equivalent to OECD 110)

MMAD (bimodal lognormal distribution ): 13.13 µm (23.4 %), 26.17 µm (76.6 %)

Vapour pressure

Not required if melting point is above 300 °C

Partition Coefficient

Not required for inorganic substances

Water solubility at 20C

16.00 ± 2.03 mg/L

Surface Tension at 25C

Not expected to be surface active

Flash point

Not required for inorganic solid substances

Self ignition temperature

no self-ignition was observed up to 430 °C


Non-flammable and no pyrophoric properties;  

flammability in contact with water not expected


Not expected to possess explosive properties

Oxidising properties

No oxidizing properties

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


Not required for solids