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LC4990 Selenium dioxide
(sublimed) for synthesis


Order number Packaging Quantity Price €
AC31990 Glass bottle 50 g 16.56
AC31990 Glass bottle 250 g 63.00
AC31990 Glass bottle 1 kg 204.3


Product information
Synonyms Selenious anhydride, Selenium(IV) oxide
Hill Formula O2Se
Chemical formula SeO2
HS Code 2811 29 90
EC number 231-194-7
Molar mass 110.95 g/mol
EC index number 034-002-00-8
CAS number 7446-08-4


Chemical and physical data
Solubility 384 g/l (14 °C)
Molar mass 110.95 g/mol
Bulk density 1500 kg/m3
pH value 2 (10 g/l, H2O, 20 °C)
Vapor pressure 16 hPa (70 °C)


Safety information according to GHS
Hazard Statement(s) H331: Toxic if inhaled.
H301: Toxic if swallowed.
H373: May cause damage to organs through prolonged or repeated exposure.
H410: Very toxic to aquatic life with long lasting effects.
Precautionary Statement(s) P273: Avoid release to the environment.
P304 + P340: IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing.
P314: Get medical advice/attention if you feel unwell.
Signal Word Danger
Hazard Pictogram(s)

RTECS VS8575000
Storage class Non combustible substances, toxic
WGK WGK 2 water endangering
Disposal 17
Inorganic selenium compounds are toxic and must be handled with caution. Container E. Elemental selenium can be recovered by first oxidizing the salts in aqueous solution with concentrated Nitric acid (Cat.No. 100443). The addition of Sodium hydrogen sulfite solution (Item No. 806356) then causes elemental selenium to precipitate out. Aqueous phase: Container D.


Safety information
R Phrase R 23/25-33-50/53
Toxic by inhalation and if swallowed.Danger of cumulative effects.Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
S Phrase S 20/21-28-45-60-61
When using do not eat, drink or smoke.After contact with skin, wash immediately with plenty of soap and water.In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible).This material and its container must be disposed of as hazardous waste.Avoid release to the environment. Refer to special instructions/ Safety data sheets.
Categories of danger toxic, dangerous for the environment
Hazard Symbol


Dangerous for the environment


Transport information
Declaration (transport by sea) IMDG-Code UN 3283 SELENIUM COMPOUND, SOLID, N.O.S.(SELENIUM DIOXIDE), 6.1, II
Declaration (transport by air) IATA-DGR UN 3283 SELENIUM COMPOUND, SOLID, N.O.S., 6.1, II


Toxicological data
LD 50 oral LD50 rat 68.1 mg/kg


Assay (iodometric) ≥ 98 %