What is Sodium Hypophosphite – what is it used for ?

sodium hypophosphite monohydrate

What is Sodium Hypophosphite monohydrate

Sodium Hypophosphite monohydrate is an odourless colourless crystalline solid that is very soluble in water and alcohol. It readily absorbs moisture from the air. It is the sodium salt of hypophosphorous acid and a strong reducing agent. Sodium hypophosphite monohydrate is mainly used for electroless nickel plating where ot forms a durable nickel-phosphorus film that can be used to coat objects with irregular surfaces.

Properties and specification of Sodium Hypophosphite

  • Synonyms: Sodium Hypophosphite monohydrate; Sodium phosphinate; Hypophosphorous acid sodium salt; Phosphinic acid sodium salt; Phosphinate de sodium;
  • CAS number: 10039–56–2
  • EINECS: 231–669–9
  • Purity: >99%
  • Appearance: white crystalline solid
  • Formula: NaPO2H2 H2O
  • Molecular weight:105.99

    sodium hypophosphite structure

  • pH: 6–8
  • Density: 1.81 g/cm3
  • Solubility in water: soluble 1000g/L @20C
  • Melting point: 90C
  • Boiling point: >200C decomposes
  • Vapour pressure: 30 hPa (20C)

Sodium Hypophosphite is not considered to be a fire hazard but it produces flammable phosphine gas when heated. It is soluble in water, alcohols and glycerine but is insoluble in organic solvents.

Uses for Sodium Hypophosphite

Electroless Nickel
Sodium Hypophosphite is often applied as reductant in non-electrical deposition of nickel. The EN process allows for uniform plating thickness on not only metal objects, but also plastic, ceramics, glass, quartz etc. It builds complexes with the nickel in the bath, improving the fineness of the surface after treatment. In addition, the film posses a good surface hardness and abrasion resistance. The product can be widely used in electronics, aviation, mechanism, and petroleum field.

Other uses

It is also used as interface activator and thermostablizer for polymers and synthetic resins during extrusion.

It is used to prevent the discoloration of polymers.

It is used to manufacture hypophosphorous acid which has same application with Sodium Hypophosphite

It is a chemical intermediate and is used as a raw material in the production of other products including synthetic organics.

It is used as a reducing agent or antioxidant in chemical processing.

Sodium Hypophosphite may be used as a partial fire-retardant.

Used in Ion Exchange Resin regeneration.

It is used as antioxidant in pharmaceuticals.

As a Water treatment agent.

As a meat preservative.

Health & Safety

Not a hazardous substance or mixture according to Regulation (EC) No. 1272/2008.
This substance is not classified as dangerous according to Directive 67/548/EEC.

S24/25 Avoid contact with eyes and skin

For full details see MSDS for Sodium Hypophosphite


Where to Buy Sodium Hypophosphite online


About mistralhowto

formulation chemist

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