Sodium hypophosphite

Sodium hypophosphite monohydrate is mainly used as a reducing agent in electroless nickel and copper plating, where it can act as a more environmentally friendly alternative than conventionally used formaldehyde. It is also used as starting material in the production of other chemicals e.g. Hypophosphorous acid. It acts as a reactive processing aid (chain length modifier, antioxidant, catalyst, colour stabilizer) in the paper, textile and plastics industries.

NaH2PO2 · H2O


Chemical Formula

NaH2PO2 · H2O

REACH Registered by W&F


EC Number


CAS Number


  • Industry chemicals
  • Surface treatment & Coatings
  • Electroless plating
  • Processing aid
  • Intermediate


  • NaH₂PO₂ · H₂O: ≥100.5%
  • Na₂HPO₃: ≤3000 ppm
  • Calcium (Ca): ≤ 40 ppm
  • Iron (Fe): ≤2 ppm
  • Chloride (Cl): ≤100 ppm
  • Sulphate (SO₄²⁻): ≤100 ppm
  • pH: 6-8

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