Formula: GaAs Formula weight: 144.64 Purity: 99.999% (metals basis) CAS Number: 1303-00-0 UN Number: UN1557 Hazard Class: 6.1 Packing Group: II Harmonized Tariff Code:  2842.90 Hazard Statements: H301-H331 Toxic if swallowed. Toxic if inhaled. Precautionary Statements: …