White crystalline, hrdroscopic and deliquescent, sodium hypophosphite is easily soluble in water and alcohol.

Mainly used as reductant for chemical plating. The advantage of sodium hypophosphite is to obtain a dense and uniform nickel phosphorus film for both large equipment and tiny components, articles with complicated external shape of convex concave lines or internal wall of deep-hollows, the surface of non-metals such as plasitc, ceramics, glass etc. The film possess a good surface hardness and abrasion resistance, sodium hypophosphite is widely used in electronics, aviation mechanism, and petroleum fields. It is also used as interface activator, M.W moderator, thermostablizer for synthetic resins and additive for foods.