... maxIron20 ppm maxUsageHypophosphorous acid is mainly used as reductant in electroless nickel plating. Also, It can be used as an additive in ... phosphate once, for example Calcium Hypophosphite, Magnesium Hypophosphite, Ammonium Hypophosphite, Nickel Hypophosphite, Manganous Hypophosphite, Ferric Hypophosphite, etc. b. It is extensive ...