What is Hypophosphorous acid sodium salt – what is it used for ?

sodium phosphinate monohydrate

What is Hypophosphorous acid sodium salt

Hypophosphorous acid sodium salt also known as Sodium phosphinate 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 Hypophosphorous acid sodium salt

  • 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 phosphinate 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 Hypophosphorous acid sodium salt

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 Hypophosphorous acid sodium salt


Where to Buy Hypophosphorous acid sodium salt online


About mistralhowto

formulation chemist

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s