Melting point :312.3 °C
Boiling point :465°C
Density :3,738 g/cm³
vapor pressure :0.033Pa at 25℃
Flash point :465°C subl.
storage temp. :Poison room
solubility :37 g/L (20°C)
form :Powder
Specific Gravity :3.738
color :White
Water Solubility :37 g/L (20 ºC)
Merck :14,804
CAS DataBase Reference :1327-53-3(CAS DataBase Reference)
NIST Chemistry Reference :Diarsenic oxide(1327-53-3)
EPA Substance Registry System :Arsenic(III) trioxide (1327-53-3)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H300 Fatal if swallowed Acute toxicity,oral Category 1, 2 Danger P264, P270, P301+P310, P321, P330,P405, P501 H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501 H318 Causes serious eye damage Serious eye damage/eye irritation Category 1 Danger P280, P305+P351+P338, P310 H350 May cause cancer Carcinogenicity Category 1A, 1B Danger H400 Very toxic to aquatic life Hazardous to the aquatic environment, acute hazard Category 1 Warning P273, P391, P501 H410 Very toxic to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 1 Warning P273, P391, P501
Precautionary statements:	P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P405 Store locked up.