Caustic soda — a strong base that fully dissociates in water. Produced by chloralkali electrolysis. Used in soap making, paper pulping, drain cleaning, and chemical manufacturing (~70 million tonnes/year).
H314Causes severe skin burns and eye damageH290May be corrosive to metalsH315Causes skin irritationH318Causes serious eye damageH319Causes serious eye irritationH370Causes damage to organsH335May cause respiratory irritationSource: PubChem GHS Classification. Always consult the SDS for handling.