Arsenic trioxide, 1327-53-3

Chemical Encyclopedia

September 11, 2025

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Chinese name: arsenic trioxide
english name: Arsenic(III) oxide
chinese alias: arsenic anhydride; Arsenic oxide (Ⅲ); Arsenic; White arsenic; Crane red
english alias: Asadin; Diarsenic trioxide; Arsenic(III) oxide; Arsenic sesquioxide; Arseneous oxide; Ratsbane; Arseneous anhydride; White arsenic; Aqua Tofani; As2O3;
CAS No:1327-53-3
chemical formula: As2O3
molecular weight:197.84
melting point:312.3 ℃
packing grade: II
Dangerous Goods Transport No: UN 1561
hazard Category Code: r28: Extremely toxic when swallowed. R34: Causes burns. R45: May cause cancer. R50/53: Extremely toxic to aquatic organisms and may cause long-term adverse effects in the aquatic environment.
Dangerous Goods Signs: n: Environmental Hazardous Substances T: Very toxic substances
safety instructions: s45: If you have an accident or feel unwell, seek medical help immediately (preferably with the product container label). S53: Avoid Exposure-Read the specific instructions before use. S60: The material residues and containers must be treated as hazardous waste. S61: Avoid discharge to the environment. Refer to special instructions/safety data sheets.
Storage conditions: Poisonroom