Salts & Minerals
REACH
Arsenic trioxide
CAS Number
1327-53-3
EC Number
215-481-4
What is Arsenic trioxide?
Arsenic trioxide (CAS 1327-53-3), also known as white arsenic, is an inorganic oxide sourced for pharmaceutical manufacturing and metallurgical processing.
Where is Arsenic trioxide used?
- Oncology drugs: active pharmaceutical ingredient in acute promyelocytic leukemia treatments
- Non-ferrous metal refining: byproduct intermediate in copper and gold smelting
- Specialty glass: fining agent that removes bubbles from molten glass
- Wood preservation: chromated copper arsenate systems remain a legacy use in certain regulated markets.
Good to know: Pharmaceutical-grade material requires strict purity documentation and is available to USP and EP specifications. Technical-grade material for metallurgical and industrial applications typically requires a certificate of analysis.
Commercial specifications
- Pharmaceutical-grade: USP and EP specifications
- Documented purity levels required for API supply chains
- Certificate of analysis typically required by buyers
Other Names (Synonyms)
White arsenic|Diarsenic oxide|As₂O₃|Arsenous oxide|Arsenious oxide|Arsenious Acid Anhydride|Arsenious Acid|Arsenigen Saure
How is Arsenic trioxide classified and handled safely? Learn More
Danger
GHS05· Corrosive GHS06· Toxic GHS08· Health Hazard GHS09· Environmental Hazard GHS07· Irritant
Hazard Statements
H300 Fatal if swallowed [Danger Acute toxicity, oral]
H314 Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]
H350 May cause cancer [Danger Carcinogenicity]
H400 Very toxic to aquatic life [Warning Hazardous to the aquatic environment, acute hazard]