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Description
Catalogue Number	800653
Synonyms	Selenious anhydride, Selenium(IV) oxide

Physicochemical Information
Density	3.950 g/cm3
Melting Point	340 °C
pH value	2 (10 g/l, H₂O, 20 °C)
Vapor pressure	1 hPa (157 °C)
Solubility	1353 g/l

Toxicological Information
LD 50 oral	LD50 Rat 68.1 mg/kg

Safety Information according to GHS
Hazard Pictogram(s)
Hazard Statement(s)	H301 + H331: Toxic if swallowed or if inhaled. H373: May cause damage to organs through prolonged or repeated exposure. H410: Very toxic to aquatic life with long lasting effects.
Precautionary Statement(s)	P260: Do not breathe dust. P264: Wash skin thoroughly after handling. P273: Avoid release to the environment. P301 + P310: IF SWALLOWED: Immediately call a POISON CENTER/doctor. P304 + P340 + P311: IF INHALED: Remove person to fresh air and keep comfortable for breathing. Call a POISON CENTER/doctor. P314: Get medical advice/ attention if you feel unwell.
Signal Word	Danger
RTECS	VS8575000
Storage class	6.1D Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects
WGK	WGK 2 obviously hazardous to water
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
Categories of danger	toxic, dangerous for the environment

Storage and Shipping Information
Storage	Store below +30°C.

Transport Information
Declaration (railroad and road) ADR, RID	UN 3283 , 6.1, III
Declaration (transport by air) IATA-DGR	UN 3283 , 6.1, III
Declaration (transport by sea) IMDG-Code	UN 3283 , 6.1, III

Specifications
Assay (iodometric)	≥ 98.0 %

Merck 800653 0050 Selenium Dioxide (Sublimed) For Synthesis 50 GR.