top of page


Our grades of Ferro Sulphide have the following chemical analyses:

Sulphide 30
Sulphide 50
S 28-33%
S 45-52%
Fe 65% min
Fe 42% min
Si 0.5% max
Si 2% max


  • 1mt big bags

  • Drums on pallets



  • 2-10mm

  • 10-50mm

  • 20-40mm


About Ferro Sulphide

Ferro Sulphide comes in two types: Iron (III) (Fe₂(SO₄)₃ ), and Iron (II) (FeSO₄). Ferrous Sulphate compounds are the by-products of the steel finishing process. Prior to coating and plating, steel sheets are passed through pickling baths of sulphuric acid, and then Ferro Sulphide is produced. This by-product can then be used in other manufacturing processes, such as in the reduction of chromate during cement production. Ferro Sulphide can also be used to stain concrete, limestone and sandstone a rust colour (produces a yellowish tint).


Key Properties Of Ferro Sulphide

Ferro Sulphide of the Iron (III) variety is yellow in colour and a rhombic crystalline salt that is soluble in water at room temperature. Iron (II), when heated, first loses its water (crystallisation) and then the original green crystals convert to ones that become a dirty-yellow solid. When heated further the solid material releases sulphur dioxide, leaving the reddish-brown iron (III) oxide. Decomposition of the Iron (II) sulphate begins at about 480°C.


Production of Ferro Sulphide

During the steel finishing process (prior to the coating and plating) when the steel sheets are passed through pickling baths of sulphuric acid, the liquid heptahydrate of Ferro Sulphide (also called copperas or green vitriol), loses water to form the colourless monohydrate solid. Ferro Sulphide is produced by reactions of sulphuric acid in a hot solution of ferrous sulphate in conjunction with an oxidising agent (such as hydrogen peroxide or nitric acid).



Ferro Sulphide, in alternate forms, is used for dyeing several base materials including wood and stone, and as a coagulant for industrial wastes. Ferro Sulphide is used in pigments and in the pickling baths for Aluminium and steel.

Contact Us

Our team is here to help you meet all of your supply needs.

Contact us today to discuss your requirements and experience the difference of working with a reliable and experienced supplier in the industry. 

bottom of page