Purity: 99.9% (metals basis) CAS Number: 7440-66-6 UN Number: UN1436 Hazard Class: 4.3 Packing Group: III Harmonized Tariff Code:  7903.90 Risk Phrases: 15-17-50/53 Contact with water liberates highly flammable gases. Spontaneously flammable in air. Very toxic to aquatic…