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Sodium hypophosphite We are manufacturer with two plants. We have exported to over *0 countries for *4 years. Specification: NaH2PO2.H2O ******3% Na2HPO3 0.3% MAX Ca *0ppm MAX SO4 **0ppm MAX Fe 1ppm MAX Cl *0ppm MAX PH **8 Pb 1ppm MAX Sodium hypophosphite (NaPO2H2, also known as sodium phosphinate) is the sodium salt of hypophosphorous acid and is often encountered as the monohydrate, NaPO2H2•H2O. It is a solid at room temperature, appearing as odorless white crystals. It is soluble in water, and easily absorbs moisture from the air. Sodium hypophosphite should be kept in a cool, dry place, isolated from oxidizing materials. It decomposes when heated and produces toxic phosphine gas, causing irritation to the respiratory tract.