Sodium hypophosphite (NaH₂PO₂) is a chemical reducer obtained from the reaction of phosphorous with caustic soda and lime. It is mainly used in electrochemical nickel plating applications, whitening agent and as catalysts in the fiber-glass industry.

Sodium hypophosphite is the sodium salt of hypophosphorous acid. 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.

Uses of Sodium Hypophosphite

Sodium hypophosphite is mainly used for electroless nickel-plating. With this method, a durable nickel-phosphorus film can coat objects with irregular surfaces, and can widely be used ionics, aviation and the petroleum field. It also can be used as a food additive.