hypophosphorous acid CAS:6303-21-5 Appearance: colorless or slightly yellow liquid Solubility: miscible in water H3PO2 content: 50% min. H3PO3: 0.5% max. Na: 1.0% max. Fe: 0.005% max. Sulfate and chloride: 0.05% max. Application: used as reducing agent, analysis reagent etc. Package: 50kg or 250kg per plastic drum, or IBC drum