Zinc Phosphate

Zinc Phosphate (Zn3(PO4)2) is an inorganic compound that is widely used as a corrosion-resistant coating on metal surfaces. Other synonyms for the compound are tri-zinc phosphate, tri-zinc diphosphate and zinc salt.

Structure & Formula

The 2D structure of the chemical compound is shown below.

Structure of Zinc Phosphate
Structure of the chemical compound (Source)

The IUPAC name for this compound is tri-zinc diphosphate and the zinc phosphate formula is given as Zn3(PO4)2.


Zinc Phosphate is prepared by mixing magnesium oxide and zinc oxide powders. This preparation process also consists of a liquid principally of water, phosphoric acid, and buffers.

Chemical & Physical Properties

Molecular Weight (amu)386.1
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count8
Rotatable Bond Count0
Exact Mass of the compound383.69116
Topological Polar Surface Area173 Å2
Heavy Atom Count13
Formal Charge0
Isotope Atom Count0
Is it Canonicaliized?Yes
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count5
Physical AppearanceWhite Dry Powder
Density (g/cm3)3.998
Melting Point (℃)900
Boiling Point (℃)158
SolubilityInsoluble in water


The compound is very toxic to aquatic life.


  • The chemical compound is used as a corrosion inhibitor and anti-scaling agent.
  • It also finds application in dyes, paint additives.
  • Primer pigment also use this compound.
  • The compound is also used in non-pesticidal agricultural products.
  • It is one of the oldest and widely used dental cement.
  • It is used for cementation of inlays, crowns, bridges, and orthodontic appliances and occasionally as a temporary restoration


What is the chemical formula of zinc phosphate?

The chemical formula for the compound is Zn3(PO4)2.

What is zinc phosphate used for?

The compound is primarily used for dental cement, and also for luting permanent metal and zirconium dioxide restorations.

Is Zn3(PO4)2 a permanent cement?

Yes, it is a permanent cement and is considered as the standard cement to measure against.

How is zinc phosphate prepared for dentistry?

The compound is prepared for dentistry by mixing zinc oxide and magnesium oxide powders with a liquid consisting of phosphoric acid, water, and buffers.

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