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Ferrous Sulfate (Iron(II) Sulfate)

FeSO4
CAS 7720-78-7 · Formula FeO4S · MW 151.91 g/mol

A low-cost iron(II) source that doubles as a reducing agent and coagulant across water treatment, cement, and pigment production. It is used as an iron micronutrient in fertilizers and animal feeds, as a coagulant in water and wastewater treatment, as a reducing agent (including chromium(VI) reduction in cement), as a mordant in dyeing, and as a precursor to iron oxide pigments.

Safety Data Sheet
HS Code
2833.29
At a Glance
Material Family
Acids & Salts
Record Type
Pure compound
Primary Role
pH Adjustment · Biocidal Action
Functional Roles
pH Adjustment Biocidal Action Synthesis Intermediate
INCI Name
FERROUS SULFATE
CosIng Functions
ASTRINGENT
Industries Served
Agriculture Beauty & Personal Care HI&I Cleaning
Applications & Use Cases
  • ▸ Water treatment: Coagulant and phosphate-removal reagent
  • ▸ Reducing agent: Chromium(VI) reduction in cement and effluents
  • ▸ Agriculture: Iron micronutrient and lawn/moss treatment
  • ▸ Pigments: Precursor for iron oxide pigments
  • ▸ Textiles: Mordant in dyeing and printing
Physical Properties
Physical Description
Ferrous sulfate appears as a greenish or yellow-brown crystalline solid. Density 15.0 lb /gal. Melts at 64 °C and loses the seven waters of hydration at 90 °C. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. Used for water or sewage treatment, as a fertilizer ingredient
Appearance
White orthorhombic crystals, hygroscopic
Boiling Point
> 300 °C
Melting Point
64
Solubility
White to yellow crystalline powder. Sol in water. Loses water @ about 300 °C; decomp @ higher temp. /Ferrous sulfate monohydrate/
Density
Density 2.970 at 25 °C; off-white, monoclinic crystals. /Ferrous sulfate monohydrate/
LogP
-0.84
Autoignition Temperature
Not flammable
Refractive Index
INDEX OF REFRACTION: 1.471, 1.478, 1.486; MP 64 °C LOSING 6H2O; BP 300 °C LOSING 7H2O. /FERROUS SULFATE HEPTAHYDRATE/
Dissociation Constants
-3
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2833 . 29
Chapter 28
Inorganic chemicals; compounds of precious metals and rare-earth metals
Heading 28.33
Internationally harmonized (WCO HS)
Subheading 2833.29
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
7720-78-7
Molecular Formula
FeO4S
Molecular Weight
151.91 g/mol
IUPAC Name
iron(2+) sulfate
INCI Name
FERROUS SULFATE
PubChem CID
24393
InChI Key
BAUYGSIQEAFULO-UHFFFAOYSA-L
Synonyms & Trade Names
FERROUS SULFATE Iron(II) sulfate Iron(2+) sulfate Ferrous sulfate anhydrous Iron sulphate Ferrous sulphate Ferrosulfate Iron sulfate (1:1) Combiron Duretter Duroferon Ferobuff Ferralyn Fersolate Ferolix Ferulen Ferusal Irospan Kesuka Odophos
Full Description

Ferrous sulfate (CAS 7720-78-7), or iron(II) sulfate, is a water-soluble iron salt. It is used as an iron micronutrient in fertilizers and animal feeds, as a coagulant in water and wastewater treatment, as a reducing agent (including chromium(VI) reduction in cement), as a mordant in dyeing, and as a precursor to iron oxide pigments.

Frequently Asked Questions

What is ferrous sulfate used for?

Ferrous sulfate (iron(II) sulfate, CAS 7720-78-7) is used as a coagulant and phosphate-removal reagent in water and wastewater treatment, as a reducing agent (including chromium(VI) reduction in cement and effluents), as an iron micronutrient in fertilizers and feed, as a textile mordant, and as a precursor for iron oxide pigments.

Is ferrous sulfate water soluble?

Yes. Ferrous sulfate is a water-soluble iron salt, which is why it is used in dosing applications such as water treatment and liquid fertilizers. Solubility varies with the hydrate form (monohydrate vs heptahydrate).

What is ferrous sulfate used for in agriculture?

In agriculture it serves as an iron micronutrient to correct iron chlorosis and as a lawn/moss treatment. Grade and particle size depend on the application; specify these on your RFQ.

What is the cost of bulk ferrous sulfate?

Pricing depends on hydrate form, grade, and packaging (bags, drums, totes, or bulk). Request a bulk quote with your volume and delivery point for current pricing.

What is the CAS number and HS code for ferrous sulfate?

Ferrous sulfate is CAS 7720-78-7, classified under HS 2833.29. An SDS and Certificate of Analysis are provided with each shipment.

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Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.

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