Formula: Na2S Formula weight: 78.04 CAS Number: 1313-82-2 UN Number: UN1385 Hazard Class: 4.2 Packing Group: II Harmonized Tariff Code:  2830.10 Hazard Statements: H311-H314-H302 Toxic in contact with skin. Causes severe skin burns and eye damage. Harmful if swallowed. …