Selenium (IV) Oxide

110.96 g·mol−1

4.81 g/mL at 25 °C(lit.)

315 °C (subl.)(lit.)

684.9 °C(lit.)

315 °C

38.4 g/100 mL (14 °C) in water

light pink solid

UN 3440 6.1/PG 3

R20/22 - Harmful by inhalation and if swallowed
R23/25 - Toxic by inhalation and if swallowed
R33 - Danger of cumulative effects
R36/38 - Irritating to eyes and skin
R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
R51/53 - Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment

S20/21 - When using do not eat, drink or smoke
S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
S28 - After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer)
S45 - In case of accident or if you feel unwell seek medical advice immediately (show the label where possible)
S60 - This material and its container must be disposed of as hazardous waste
S61 - Avoid release to the environment. Refer to special instructions/safety data sheet

6.1

T, N, Xn

UN 3440 6.1 / PG 3